| Label | Text | Page | Extraction method |
|---|
| 0.128 |
0.128-inch) nails minimum at 16 inches (406 mm) on center along each edge. Beams shall be permitt
to cantilever at each end up to one-fourth of the actual beam span. Deck beams of other materials sh
be permitted where designed in accordance with accepted engineering practices.
R507.6 Deck joists. Maximum allowable spans for wood deck joists, as shown in Figure R507.6, sha
in accordance with Table R507.6. The maximum joist spacing shall be limited by the decking material
accordance with Table R507.7.
Insert Facing Page 5-29 |
68 |
pdf_text |
| 1 |
1. Type S – Where the means of egress contains stairs, elevators, or platform lifts. |
52 |
pdf_text |
| 1 |
1. Local intermittent exhaust systems for kitchens shall be tested and verified to provide a
minimum airflow rate or capture efficiency required by Table M1505.4.4.3. Testing shall inclu
verification of the maximum sound rating as specified in Section M1505.4.4.3.2. Testing for th
intermittent kitchen exhaust systems shall occur with the whole-house ventilation system
operating and with all dwelling unit or sleeping unit entry doors closed. Testing for exhaust
systems that require makeup air in accordance with Section M1503.6 shall include verifying t
the mechanical makeup air system is controlled to automatically start. Testing for exhaust
systems that do not require mechanical makeup air in accordance with Section M1503.6 and
are exempt from pressurize equalization shall be tested with operable openings manually ope
unless design exhaust airflow can be achieved with all operable openings closed. Testing sh
performed according to the ventilation equipment manufacturer's instructions, or by using a fl
hood, flow grid, or other airflow measuring device. Where required by the building official, test
shall be conducted by an approved third party. A written report of the results of the test shall
signed by the party conducting the test and provided to the building official.
EXCEPTION:
The installed airflow is not required to be field-verified where an exhaust airflow rating at a pressure of 0.2
w.g. is used, provided the duct sizing meets the prescriptive requirements of T |
112 |
pdf_text |
| 1 |
1. The original occupancy classification is not changed; and |
11 |
pdf_text |
| 1 |
1. Additions with less than 500 square feet of conditioned floor area are exempt from the requirements for
Whole-House Ventilation Systems, Section M1505.4. |
11 |
pdf_text |
| 1 |
1. Exposed earth is covered with a continuous Class I vapor retarder. Joints of the vapor reta
shall overlap by 6 inches (152 mm) and shall be sealed or taped. The edges of the vapor reta
shall extend at least 6 inches (152 mm) up the stem wall and shall be attached and sealed to
stem wall; and a radon system shall be installed that meets the requirements of Appendix AF
(Radon) of this code. |
63 |
pdf_text |
| 1 |
1. Broiler units that incorporate an integral exhaust system, and that are listed and labeled for use without
exhaust hood, shall not be required to have an exhaust hood. |
105 |
pdf_text |
| 1 |
1. Use of toilet facilities while under supervision of an adult staff person; |
54 |
pdf_text |
| 1 |
1. The state building code council has determined that a local ordinance providing specifications for light st
clay or strawbale construction, requiring a solar-ready zone, requiring fire sprinklers, or addressing
construction and demolition material management or building deconstruction in accordance with Appendix
AS, AT, AWV, AWY, OR AWZ of this code may be adopted by any local government upon notification of
council. |
11 |
pdf_text |
| 1 |
1. The 10-foot (3048 mm) separation is not required where the intake opening is located 3 feet (914 mm) o
greater below the contaminant source. |
39 |
pdf_text |
| 1 |
1. The installed airflow is not required to be field-verified where an exhaust airflow rating at a pressure of 0
in. w.g. is used, provided the duct sizing meets the prescriptive requirements of Table M1505.4.4.2. |
110 |
pdf_text |
| 1 |
1. Anchorage and strapping shall be designed to resist a horizontal force equal to one-third of
operating weight of the water storage tank, acting in any horizontal direction. |
102 |
pdf_text |
| 1 |
1. Wood cook stoves. |
40 |
pdf_text |
| 1 |
1. For the sole use of residents and invited guests at a single-family dwelling; |
51 |
pdf_text |
| 1 |
1. All-purpose solvent cement, unless listed for the specific application. |
134 |
pdf_text |
| 1 |
1. Equipment connected to duct systems shall be designed to limit discharge air temperature
maximum of 250°F (121°C). |
114 |
pdf_text |
| 1 |
1. A source from outside the structure of primary combustion air, connected to the appliance
accordance with manufacturer's specification. The air inlet shall originate at a point below the
box. The duct shall be 4 inches (102 mm) or greater in diameter, not exceed 20 feet (6096 m
length, and be installed in accordance with manufacturer's instructions; or |
96 |
pdf_text |
| 1 |
1. Adult family homes, foster family care homes and family day care homes licensed by the
Washington state department of social and health services. |
18 |
pdf_text |
| 1 |
1. Stairways from the basement open directly to the exterior of the building without entering t
first floor; |
54 |
pdf_text |
| 1 |
1. Primary combustion air ducted from the outside of the structure to the appliance. |
94 |
pdf_text |
| 1 |
1. Work involving only the exterior surfaces of dwellings, such as the replacement of roofing or siding, or th
addition or replacement of windows or doors, or the addition of a porch or deck, is exempt from the inspect
requirements of this section. |
48 |
pdf_text |
| 1 |
1 vertical to 12 horizontal and 1 vertical and 20 horizontal in accordance with Sections R311.8.3.1
through R311.8.3.3.
R330.10 Stair treads and risers. Stair treads and risers shall be constructed in accordance with Sec
R311.7.5. Handrails shall be installed in accordance with Section R330.10.1.
R330.10.1 Handrails for treads and risers. Handrails shall be installed on both sides of treads and
risers numbering from one riser to multiple risers. Handrails shall be installed in accordance with Sect
R311.7.8.1 through R311.7.8.4.
R330.11 Shower stalls. Where provided to meet the requirements for bathing facilities, the minimum
of shower stalls for an adult family home shall be 30 inches (762 mm) deep by 48 inches (1219 mm) l
R331.1 Family home child care. For family home child care with more than six children, each floor l
used for family child care purposes shall be served by two remote means of egress. Exterior exit door
shall be operable from the inside without the use of keys or any special knowledge or effort. Basemen
located more than 4 feet below grade level shall not be used for family home child care unless one of
following conditions exist: |
54 |
pdf_text |
| 1 |
1. To the closest interior lot line; or |
19 |
pdf_text |
| 1 |
1. Where roof surfaces adjacent to the wall or walls are at the same elevation, the parapet sh
extend not less than 30 inches (762 mm) above the roof surfaces. |
34 |
pdf_text |
| 1 |
1. Concrete tile or tile roof covering of similar weight is installed on more than 50 percent of th
total roof area. |
135 |
pdf_text |
| 1 |
1. Verify that the system is installed in accordance with the approved plans and manufacturer
instructions and is operating properly. |
51 |
pdf_text |
| 1 |
1. Buildings in which the increase in dead load is due entirely to the addition of a second layer of roof cove
weighing 3 pounds per square foot (0.1437 kN/m2) or less over an existing single layer of roof covering. |
135 |
pdf_text |
| 1 |
1. A weather-resistant exterior wall envelope shall not be required over concrete or masonry walls designe
accordance with Chapter 6 and flashed according to Section R703.4 or R703.8. |
88 |
pdf_text |
| 1 |
1. Smoke alarms shall be permitted to be battery operated where installed in buildings without commercial
power. |
48 |
pdf_text |
| 1 |
1. The structure has been identified as a historic building; or |
150 |
pdf_text |
| 1 |
1. Storm shelters and basements used only to house mechanical equipment not exceeding a total floor are |
41 |
pdf_text |
| 1 |
1. Work involving the exterior surfaces of dwellings, such as the replacement of roofing or siding, the additi
replacement of windows or doors, or the addition of a porch or deck are exempt from the requirements of t
section. |
47 |
pdf_text |
| 1 |
1. Guards on the open sides of stairs shall have a height of not less than 34 inches (864 mm) measured
vertically from a line connecting the nosings. |
46 |
pdf_text |
| 1 |
1. Weight or volume of project-generated construction and demolition material; |
149 |
pdf_text |
| 1 |
1. Masonry heaters shall comply with the requirements of ASTM E 1602; or |
94 |
pdf_text |
| 1 |
1 5/8 inche
For SI: 1 inch = 25.4 mm.
a. Lag screws or bolts shall be staggered from the top to the bottom along the horizontal run of the deck ledger in accordance
Figure R507.9.1.3(1).
b. Maximum 5 inches.
c. For engineered rim joists, the manufacturer's recommendations shall govern.
d. The minimum distance from bottom row of lag screws to the top edge of the ledger shall be in accordance with Figure
R507.9.1.3(1).
e. The 2 inches may be reduced to 3/4 inch when the band joist is directly supported by a mudsill, a header or by double top w
plates.
Insert Facing Page 5-41 |
74 |
pdf_text |
| 1 |
1. Steel pipe joints shall be welded. |
120 |
pdf_text |
| 1 |
1. An automatic residential fire sprinkler system shall not be required where additions or alterations are ma
an existing townhouse unit that does not have an automatic residential fire sprinkler system installed. |
47 |
pdf_text |
| 1 |
1. Uninhabitable attics, crawl spaces and normally unoccupied concealed spaces that do not contain fuel-f
appliances do not require sprinklers. In uninhabitable attics, crawl spaces and normally unoccupied conce
spaces that contain fuel-fired equipment, a sprinkler shall be installed above the equipment; however, spri
shall not be required in the remainder of the space. |
130 |
pdf_text |
| 1 |
1. The fire-resistance-rated wall or assembly shall extend to the outside edge of the upper sto
(see Figure R302.2(1)); or |
34 |
pdf_text |
| 1 |
1. Dimensional lumber not identified with a grade mark that has a nominal thickness of 2 inches with
nominal width of 6 inches, or less, shall be assumed to be spruce-pine-fir stud grade and shall have
structural properties assigned in accordance with current adopted standards. All other dimensional
lumber shall be assumed to be hem-fir No. 2 grade and shall have structural properties assigned in
accordance with current adopted standards.
Insert Facing Page 6-1 |
78 |
pdf_text |
| 1 |
1. For rooms with sloped ceilings, the required floor area of the room shall have a ceiling height of not less |
136 |
pdf_text |
| 1 |
1. In accordance with the manufacturer's instructions. |
104 |
pdf_text |
| 1 |
1. Where approved, repurposed unlisted battery systems from electric vehicles are allowed to be installed
outdoors or in detached sheds located not less than 5 feet (1524 mm) from exterior walls, property lines, a
public ways. |
51 |
pdf_text |
| 1 |
1. The solid fuel burning appliance is part of a central heating plant and installed in an unconditioned spac
conformance with the International Mechanical Code; or |
96 |
pdf_text |
| 1 |
1. Exhaust fans shall be tested and rated in accordance with the airflow and sound rating
procedures of the Home Ventilating Institute (HVI 915, HVI Loudness Testing and Rating
Procedure, HVI 916, HVI Airflow Test Procedure, and HVI 920, HVI Product Performance
Certification Procedure). |
110 |
pdf_text |
| 1 |
1 5/8 inche
Band joist c |
74 |
pdf_text |
| 1 |
1. The loft floor area shall be less than 70 square feet (6.5 m2). |
55 |
pdf_text |
| 1 |
1. The whole-house ventilation system shall be controlled with manual switches, timers or oth
means that provide for automatic operation of the ventilation system that are readily accessib
the occupant; |
108 |
pdf_text |
| 1 |
1. A fire-resistance rating of 1/2 hour shall be permitted in buildings equipped throughout with an automati
sprinkler system installed in accordance with Section P2904. |
34 |
pdf_text |
| 1 |
1. In each sleeping room. |
47 |
pdf_text |
| 1 |
1. Perforated sheet metal plates not less than 0.070 inch (1.8 mm) thick. |
63 |
pdf_text |
| 1 |
1. Tightly fitting flue dampers, operated by a readily accessible manual or approved automati
control.
EXCEPTION:
Fireplaces with gas logs shall be installed in accordance with the International Mechanical Code Section 9
except that the standards for liquefied petroleum gas installations shall be NFPA 58 (Liquefied Petroleum
Code) and NFPA 54 (National Fuel Gas Code). |
93 |
pdf_text |
| 1 |
1. Not less than 3 feet (914 mm) from property lines. |
106 |
pdf_text |
| 1 |
1. The replacement window is the manufacturer's largest standard size window that will fit wit
the existing frame or existing rough opening. The replacement window is of the same operati
style as the existing window or a style that provides for an equal or greater window opening a
than the existing window. |
134 |
pdf_text |
| 1 |
1. Decorative glazed openings. |
84 |
pdf_text |
| 1 |
1. Required glazed openings that face into a roofed porch where the porch abuts a street, yard or court ar
permitted where the longer side of the porch is not less than 65 percent unobstructed and the ceiling heigh
not less than 7 feet (2134 mm). |
39 |
pdf_text |
| 1 |
1. Exterior windows and doors, fireplace and stove doors shall be closed, but not sealed, bey
the intended weather stripping or other infiltration control measures. |
142 |
pdf_text |
| 1 |
1. The loft has a maximum depth of less than 3 feet (914 mm). |
55 |
pdf_text |
| 1-1 |
1-1
WAC 51-51-0102
Section R102 – Applicability |
6 |
pdf_text |
| 1-2 |
1-2
Chapter 2 Definitions
WAC 51-51-0202
Section R202 – Definitions |
6 |
pdf_text |
| 1-4 |
1-4
NP
NP |
71 |
pdf_text |
| 1-6 |
1-6
NP
NP |
71 |
pdf_text |
| 1.0 |
1.0
a. For ventilation system run-time values between those given, the factors are permitted to be determined by interpolation.
b. Extrapolation beyond the table is prohibited.
M1505.4.4 Local exhaust rates. Local exhaust systems shall be designed to have the capacity to
exhaust the minimum airflow rate determined in accordance with Table M1505.4.4.1. If the local exha
fan is included in the whole-house ventilation system, in accordance with Section 1505.4.1, then the
exhaust fan shall be controlled to operate as specified in Section M1505.4.2.
M1505.4.4.1 Local exhaust. Bathrooms, toilet rooms, and kitchens shall include a local exhaust syst
Such local exhaust systems shall have the capacity to exhaust the minimum airflow rate in accordanc
with Table M1505.4.4.1. Fans required by this section shall be provided with controls that enable man
override or automatic occupancy sensor, humidity sensor, timer controls, or pollutant sensor controls.
"on/off" switch shall meet this requirement for manual controls. Manual fan controls shall be readily
accessible in the room served by the fan.
Table M1505.4.4.1
Minimum Local Exhaust Rates
Area to Be Exhausted
Exhaust Rates
Intermittent
Continuous
Open Kitchens
In accordance with Section M1505.4.4.3
Not Permitted
Enclosed Kitchens
In accordance with Section M1505.4.4.3 |
110 |
pdf_text |
| 10 |
10-
Chapter 11 is not adopted
Chapter 12 Mechanical Administration
WAC 51-51-1201
Section M1201 – General |
7 |
pdf_text |
| 10 |
10-
WAC 51-51-1004
Section R1004 – Factory-Built Fireplaces |
7 |
pdf_text |
| 10 |
10-
WAC 51-51-1002
Section R1002 – Masonry Heaters |
7 |
pdf_text |
| 10 |
10 percent of each other. The tested and balanced total mechanical exhaust airflow rate is within 10
percent or 5 cfm, whichever is greater, of the total mechanical supply airflow rate. The flow rate test
results shall be submitted and posted in accordance with Section M1505.4.1.7. The exhaust fan shall
meet the requirements of Section M1505.4.1.2. The supply fan shall meet the requirements of Sectio
M1505.4.1.3. Balanced ventilation systems with both supply and exhaust fans in a packaged product,
such as an ERV/HRV shall meet the requirements of HVI 920, as applicable. Local exhaust systems t
are not a component of the whole-house mechanical ventilation system are exempt from the balance
airflow calculation. |
108 |
pdf_text |
| 10 |
10-
WAC 51-51-1006
Section R1006 – Exterior Air Supply |
7 |
pdf_text |
| 10 (cont. 2) |
M1505.4.1.5 Furnace integrated supply. Systems using space heating and/or cooling air handler fa
for outdoor air supply distribution are not permitted.
EXCEPTION:
Air handler fans shall have multispeed or variable speed supply airflow control capability with a low speed
operation not greater than 25 percent of the rated supply airflow capacity during ventilation only operation.
Outdoor air intake openings must meet the provisions of Sections R303.5 and R303.6 and must include a
motorized damper that is activated by the whole house ventilation system controller. The motorized dampe
must be controlled to maintain the outdoor airflow intake airflow within 10 percent of the whole house
mechanical exhaust airflow rate. The flow rate for the outdoor air intake must be tested and verified at the
minimum ventilation fan speed and the maximum heating or cooling fan speed. The results of the test shal
submitted and posted in accordance with Section M1505.4.1.7. |
108 |
pdf_text |
| 10 (cont. 3) |
M1505.4.1.6 Testing. Whole-house mechanical ventilation systems shall be tested, balanced and ver
to provide a flow rate not less than the minimum required by Sections M1505.4.3 and M1505.4.4.1.
Testing shall be performed according to the ventilation equipment manufacturer's instructions, or by u
a flow hood, flow grid, or other airflow measuring device at the mechanical ventilation fan's inlet termi
outlet terminals or grilles or in the connected ventilation ducts. Where required by the building official,
testing shall be conducted by an approved third party. A written report of the results of the test shall b
signed by the party conducting the test and provided to the building official and be posted in the dwell
unit per Section M1505.4.1.7.
M1505.4.1.7 Certificate. A permanent certificate shall be completed by the mechanical contractor, te
and balance contractor or other approved party and posted on a wall in the space where the furnace i
located, a utility room, or an approved location inside the building. When located on an electrical pane
the certificate shall not cover or obstruct the visibility of the circuit directory label, service disconnect l
or other required labels. The certificate shall list the flow rate determined from the delivered airflow of
whole-house mechanical ventilation system as installed and the type of mechanical whole house
ventilation system used to comply with Section M1505.4.3.1. |
108 |
pdf_text |
| 10 (cont. 4) |
M1505.4.2 System controls. The whole-house mechanical ventilation system shall be provided with
controls that comply with the following: |
108 |
pdf_text |
| 1111 |
1111 19th St N.W., #402
Washington D.C. 20036
HRH-2-2019: Household Range Hoods.
M1505.4.4.2
Certified Range Hood Directory
M1505.4.4.3.1
ANCE
NMX-J-521/2-40-ANCE—2019/CAN/CSA-22.2 No. 60335-2-40—19/UL 60335-2-40-2019 Househol
and Similar Electrical Appliances - Safety-Part 2-40: Particular Requirements for Electric Heat
Pumps, Air-Conditioners and Dehumidifiers.
M1403.1, M1412.1, M1413.1
ANSI
LC 1/CSA 6.26—18: Fuel Gas Piping Systems Using Corrugated Stainless Steel Tubing (CSST)
G2414.5.4, G2411.3, G2415.5 |
132 |
pdf_text |
| 11R |
11R WAC; Plumbing Code is regulated by chapter 51-56 WAC; Electrical Code is regulated by chapt |
9 |
pdf_text |
| 12 |
12
MAXIMUM DECK POST HEIGHT a (fe |
67 |
pdf_text |
| 12 |
12-
Chapter 13 General Mechanical System Regulations
WAC 51-51-1301
Section M1301 – General |
7 |
pdf_text |
| 120 |
120 pcf. Wood framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. T
load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load,
L=live load, S=snow load. TL=max (LC1, LC2, LC3).
b. Use tributary span of floor and roof. Figure may be used to size exterior and interior footings.
c. Add 4 feet to tributary floor span for each wood framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story).
d. Multiply floor span by 1.25 for interior footings supporting continuous joists.
e. Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness.
f. Dashed line may be used for interior footing size only.
g. Use footing size indicated on line above the span combination used.
h. For span combinations above the upper line, a design professional is required.
i. Interpolation between footing sizes is allowed. Extrapolation is not allowed.
Insert Page 4-8 #2
Insert Facing Insert Page 4-8 #3 |
58 |
pdf_text |
| 120 |
120 pcf. Wood framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. T
load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load,
L=live load, S=snow load. TL=max (LC1, LC2, LC3).
b. Use tributary span of floor and roof. Figure may be used to size exterior and interior footings.
c. Add 4 feet to tributary floor span for each wood framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story).
d. Multiply floor span by 1.25 for interior footings supporting continuous joists.
e. Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness.
f. Dashed line may be used for interior footing size only.
g. Use footing size indicated on line above the span combination used.
h. For span combinations above the upper line, a design professional is required.
i. Interpolation between footing sizes is allowed. Extrapolation is not allowed.
Insert Page 4-8 #4
Insert Facing Insert Page 4-8 #5 |
60 |
pdf_text |
| 120 |
120 pcf. Wood framed walls = 10 foot; crawlspace stem wall = 6 inches × 36 inches; basement wall = 8 inches × 120 inches. T
load (TL) equal to the maximum of three load combinations: LC1=D+L, LC2=D+S and LC3=D=0.75(L+S), where D=dead load,
L=live load, S=snow load. TL=max (LC1, LC2, LC3).
b. Use tributary span of floor and roof. Figure may be used to size exterior and interior footings.
c. Add 4 feet to tributary floor span for each wood framed wall above first level (i.e., 4 feet for 2-story, 8 feet for 3-story).
d. Multiply floor span by 1.25 for interior footings supporting continuous joists.
e. Multiply footing width by (1500 psf/capacity) for soil capacity other than 1500 psf. See Section R403.1.1 for thickness.
f. Dashed line may be used for interior footing size only.
g. Use footing size indicated on line above the span combination used.
h. For span combinations above the upper line, a design professional is required.
i. Interpolation between footing sizes is allowed. Extrapolation is not allowed.
Insert Page 4-
Insert Facing Insert Page 4- |
59 |
pdf_text |
| 13 |
13-
Chapter 14 – Heating and Cooling Equipment and Appliances
WAC 51-51-1413
Section M1413 – Evaporative Cooling Equipment |
7 |
pdf_text |
| 13 |
13-
WAC 51-51-1307
Section M1307 – Appliance Installation |
7 |
pdf_text |
| 13d |
13d.
Every sleeping or napping room in a family home child care shall have at least one operable window f
emergency rescue.
EXCEPTION:
Sleeping or napping rooms having doors leading to two separate means of egress, or a door leading direct
the exterior of the building.
Rooms or spaces containing a commercial-type cooking kitchen, boiler, maintenance shop, janitor clo
laundry, woodworking shop, flammable or combustible storage, or painting operation shall be separat
from the family home child care area by at least 1-hour fire-resistant construction.
EXCEPTION:
A fire-resistant separation shall not be required where the food preparation kitchen contains only a domes
cooking range, and the preparation of food does not result in the production of smoke or grease laden vap |
54 |
pdf_text |
| 14 |
14-
Chapter 15 – Exhaust Systems
WAC 51-51-1503
Section M1503 – Domestic Cooking Exhaust Equipment |
7 |
pdf_text |
| 14 |
14
MAXIMUM DECK BEAM SPAN L
(feet-inches)
Douglas fir-larch g,
Hem-fir g,
Spruce-pine-fir g |
70 |
pdf_text |
| 14-0 |
14-0 14-
Redwood f, Western Cedars f,
Ponderosa Pine f, Red Pine f |
67 |
pdf_text |
| 14-0 |
14-0 14-
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm,1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa, NP = Not per
a. Measured from the underside of the beam to top of footing or pier.
b. 10 psf dead load. Snow load not assumed to be concurrent with live load.
c. No. 2 grade, wet service factor included.
d. Notched deck posts shall be sized to accommodate beam size in accordance with Section 507.5.2.
e. Includes incising factor.
f. Incising factor not included.
g. Area, in square feet, of deck surface supported by post and footing.
h. Interpolation permitted. Extrapolation not permitted.
Insert Facing Page |
67 |
pdf_text |
| 15 |
15-
WAC 51-51-1505
Section M1505 – Mechanical Ventilation |
7 |
pdf_text |
| 15 |
15-
WAC 51-51-1504
Section M1504 – Exhaust Ducts and Exhaust Openings |
7 |
pdf_text |
| 15 |
15-
WAC 51-51-1600
Chapter 16 – Duct Systems |
7 |
pdf_text |
| 1505.4.3 |
1505.4.3 shall be adjusted by the system coefficient in Table M1505.4.3(2) based on the system type
meeting the definition of a balanced whole house ventilation system and/or not meeting the definition
a distributed whole-house ventilation system.
Q v = Q r * C system
(Equation 15-2)
Where: Q v = Quality-adjusted ventilation airflow rate in cubic feet per minute (cfm).
Q r = Ventilation airflow rate, cubic feet per minute (cfm) from 15-1 or Table M1505.4.3(1).
C system = System coefficient from Table 1505.4.3(2). |
109 |
pdf_text |
| 16 |
16-
WAC 51-51-1700
Chapter 17 – Combustion Air |
7 |
pdf_text |
| 17 |
17-
WAC 51-51-2000
Chapter 20 – Boilers and Water Heaters |
7 |
pdf_text |
| 1998 |
1998 (SB 6168). "Temporary worker housing" means a place, area, or piece of land where sleeping
places or housing sites are provided by an employer for his or her employees or by another person,
including a temporary worker housing operator, who is providing such accommodations for employee
for temporary, seasonal occupancy, and includes "labor camps" under RCW 70.54.110.
Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW s
not apply unless specifically adopted by the authority having jurisdiction.
The standards for liquefied petroleum gas installations shall be NFPA 58 (Liquefied Petroleu
Gas Code) and NFPA 54 (National Fuel Gas Code). All other fuel gas installations shall be regulated
the International Mechanical Code and International Fuel Gas Code.
Implementation.
The International Residential Code adopted by chapter 51-51 WAC shall become effective in
counties and cities of this state on March 15, 2024.
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9 |
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| 2 |
2. Where the dwelling unit or townhouse unit is equipped with an automatic sprinkler system installed in
accordance with Section P2904, sleeping rooms in basements shall not be required to have emergency es
and rescue openings provided that the basement has one of the following: |
41 |
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| 2 |
2. The underside of the exposed floor-ceiling assembly shall be protected as required for
projections in Section R302 (see Figure R302.2(2)).
R302.2.4 Parapets for townhouses. Parapets constructed in accordance with Section R302.2.5 sha
constructed for townhouses as an extension of exterior walls or common walls separating townhouse
units in accordance with the following: |
34 |
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| 2 |
2. Whether the material was disposed in a landfill or diverted; |
149 |
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| 2 |
2. The replacement window is not part of a change of use.
R4502.5.5 Window opening control device and fall protection device height. Window opening co
devices or fall protection device shall be located at a height in accordance with Section R310.1.1 or
low a height as can be installed within the existing clear opening.
R4502.6 Flood hazard areas. Work performed in existing buildings located in a flood hazard area as
established by Table R301.2 shall be subject to the provisions of Section R105.3.1.1.
R4503.1 General. Repairs shall comply with the applicable provisions of the code for new constructio
as permitted by this section. Work on undamaged components that is necessary for the required repa
damaged components shall be considered part of the repair and shall not be subject to requirements
for alterations.
R4503.2 Materials. Materials used during repairs shall comply with this section.
R4503.2.1 New and replacement materials. Except as otherwise required or permitted by this code,
materials permitted by this code for new construction, shall be used. Like materials shall be permitted
for repairs, provided that unsafe conditions are not created. Hazardous materials shall not be used w
this code does not permit their use in buildings of similar occupancy, purpose, and location. |
134 |
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| 2 |
2. Provide a copy of the manufacturer’s installation, operation, maintenance, and
decommissioning instructions provided with the listed system. |
51 |
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| 2 |
2. Type NS1 – Where one means of egress is at grade level or a ramp constructed in accord
with Section R330.9 is provided. |
52 |
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| 2 |
2. Additions or alterations to existing buildings which do not require the construction of foundations,
crawlspaces, slabs or basements shall not be required to meet the requirements for radon protection in Se
R332.1 and Appendix AF.
R102.7.2 Moved buildings. Buildings or structures moved into or within a jurisdiction shall comply wi
the provisions of this code, the International Building Code (chapter 51-50 WAC), the International
Mechanical Code (chapter 51-52 WAC), the International Fire Code (chapter 51-54A WAC), the Unifo
Plumbing Code and Standards (chapter 51-56 WAC), and the Washington State Energy Code (chapt |
11 |
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| 2 |
2. Battery systems that are an integral part of an electric vehicle are allowed provided that the installation
complies with Section 625.48 of NFPA 70. |
51 |
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| 2 |
2. Appendix AF, Radon Control Methods, Appendix AQ, Tiny Homes, and Appendix AWU, Dwelling Unit F
Sprinkler Systems, are included in adoption of the International Residential Code.
R102.7.1 Additions, alterations, change of use, repairs, or relocations. Additions, alterations, rep
or relocations shall be permitted to conform to the requirements of the provisions of Chapter 45 or sh
conform to the requirements for new structure without requiring the existing structure to comply with t
requirements of this code, unless otherwise stated. Additions, alterations, repairs, and relocations sha
not cause an existing structure to become less compliant with the provisions of this code than the exi
building or structure was prior to the addition, alteration, repair, or relocation. Where additions, alterati
or changes of use to an existing structure result in a use or occupancy, height, or means of egress
outside the scope of this code, the building shall comply with the International Existing Building Code.
EXCEPTIONS: |
11 |
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| 2 |
2. Installation, alteration or repairs of nonfuel burning plumbing or mechanical systems or electrical system
exempt from the inspection requirements of this section. |
48 |
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| 2 |
2. Clothes closets, linen closets and pantries not exceeding 24 square feet (2.2 m2) in area, with the small
dimension not greater than 3 feet (915 mm) and having wall and ceiling surfaces of gypsum board. |
130 |
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| 2 |
2. The loft has a floor area of less than 35 square feet (3.3 m2). |
55 |
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| 2 |
2. Masonry heaters shall be listed and labeled in accordance with UL 1482 or CEN 15250 an
installed in accordance with the manufacturer's installation instructions.
R1002.2.1 Combustion air and doors. Masonry heaters shall be provided with both of the following: |
94 |
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| 2 |
2. The structure was built 90, or more, years ago.
EXCEPTIONS: 1. The structure is determined to be unsafe by the engineer of record; |
150 |
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| 2 |
2. The structure shall be relocated; |
150 |
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| 2 |
2. Installation, alteration or repairs of plumbing, electrical or mechanical systems are exempt from the
requirements of this section.
R314.2.3 New attached garages. A heat detector or heat alarm rated for the ambient outdoor
temperatures and humidity shall be installed in new garages that are attached to or located under ne
and existing dwellings. Heat detectors and heat alarms shall be installed in a central location and in
accordance with the manufacturer’s instructions.
EXCEPTION:
Heat detectors and heat alarms shall not be required in dwellings without commercial power.
R314.3 Location. Smoke alarms shall be installed in the following locations: |
47 |
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| 2 |
2. Antique wood heaters manufactured prior to 1940.
R307.1 Space required. Fixtures shall be spaced in accordance with Figure R307.1, and in accorda
with the requirements of the state plumbing code Section 402.5.
Insert Page 3-40 #2 & 3-41
Insert Facing Page 3-41 |
40 |
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| 2 |
2. To the centerline of a street, an alley or public way; or |
19 |
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| 2 |
2. One of the two required means of egress discharges directly to the exterior from the base
level, and a self-closing door is installed at the top or bottom of the interior stair leading to the
floor above; |
54 |
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| 2 |
2. Brick veneer or cladding of similar weight is installed on walls above the second story.
R4504.5 Ventilation. Reconfigured spaces intended for occupancy and spaces converted to habitabl
occupiable space in any work area shall be provided with ventilation in accordance with Section R303
Insert Page
Insert Facing Insert Page |
135 |
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| 2 |
2. On level platforms in accordance with M1305.1.3.1. |
104 |
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| 2 |
2. Where roof surfaces adjacent to the wall or walls are at different elevations and the higher
is not more than 30 inches (762 mm) above the lower roof, the parapet shall extend not less t |
34 |
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| 2 |
2. Broiler units permanently installed outside the building envelope and having the cooking surface at least
feet below a 1-hour fire resistance rated ceiling shall not be required to have an exhaust hood.
M1503.3 Exhaust discharge. Domestic cooking exhaust equipment shall discharge to the outdoors
through a duct. The duct shall have a smooth interior surface, shall be airtight, shall be equipped with
backdraft damper and shall be independent of all other exhaust systems. Ducts serving domestic coo
exhaust equipment shall not terminate in an attic or crawl space or areas inside the building.
EXCEPTION:
Where installed in accordance with the manufacturer's instructions, and where continuous local exhaust is
provided in an enclosed kitchen in accordance with Table M1505.4.4.1, listed and labeled ductless range
shall not be required to discharge to the outdoors.
Insert Facing Page |
105 |
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| 2 |
2. The loft ceiling height shall not exceed 7 feet (2134 mm) for more than one half of the loft fl
area.
The provisions of Sections R333.3 through R333.5 shall not apply to lofts that do not comply with Ite
and 2 of this section.
R333.3 Loft ceiling height. The ceiling height below a loft shall not be less than 7 feet (2134 mm). T
ceiling height above the finished floor of the loft shall not be less than 3 feet (914 mm). Portions of the
with a sloped ceiling measuring less than 3 feet (914 mm) from the finished floor to the finished ceilin
shall not contribute to the loft floor area.
R333.4 Loft area. The aggregate area of all lofts and mezzanines within a room shall comply with
Section R325.3.
EXCEPTION:
The area of a single loft located within a dwelling unit or sleeping unit equipped with an automatic sprinkler
system in accordance with Section P2904 shall not be greater than two-thirds of the area of the room in w
is located, provided that no other lofts or mezzanines are open to the room in which the loft is located.
R333.5 Permanent egress for lofts. Where a permanent means of egress is provided for lofts, the
means of egress shall comply with Section R311 as modified by Section R333.5.1.
R333.5.1 Ceiling height at loft means of egress. A minimum ceiling height of 3 feet (914 mm) shall
provided for the entire width of the means of egress from the loft. |
55 |
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| 2 |
2. Continuously operated mechanical exhaust ventilation is provided at a rate equal to 1 cubi
foot per minute (0.47 L/s) for each 50 square feet (4.7 m2) of crawlspace floor area. Exhaust
ventilation shall terminate to the exterior.
EXCEPTION:
Plenum in existing structures complying with Section M1601.5, if under-floor space is used as a plenum.
Insert Facing Page |
63 |
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| 2 |
2. Where an accessory dwelling unit is added within an existing single-family residence to create a two-fa
dwelling, fire rated separation between the accessory dwelling unit and the primary dwelling unit is not req
when all required smoke alarms are interconnected in such a manner that the actuation of one alarm will
activate all alarms in both the primary dwelling unit and the accessory dwelling unit. |
34 |
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| 2 |
2. The verification shall utilize certified rating data from the HVI Publication 911, AHAM-Certifi
Range Hood Directory, or another directory of certified product performance ratings approved
the code official for determining compliance. The verification procedure shall consist of visual
inspection of the local intermittent kitchen exhaust system to verify and record the following
information: |
112 |
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| 2 |
2. Where the top of the guard serves as a handrail on the open sides of stairs, the top of the guard shall b
less than 34 inches (864 mm) and not more than 38 inches (965 mm) as measured vertically from a line
connecting the nosings. |
46 |
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| 2 |
2. The original building is not substantially remodeled or rehabilitated. For the purposes of this section a b
shall be considered to be substantially remodeled when the costs of remodeling exceed 60 percent of the
of the building exclusive of the costs relating to preparation, construction, demolition or renovation of
foundations.
Insert Facing Pag |
11 |
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| 2 |
2. Fan airflow rating and duct system shall be designed and installed to deliver at least the
exhaust airflow required by Table M1505.4.4.1. The airflows required refer to the delivered ai
of the system as installed and tested using a flow hood, flow grid, or other airflow measureme
device. Local exhaust systems shall be tested, balanced, and verified to provide a flow rate n
less than the minimum required by this section. |
110 |
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| 2 |
2. For the sole use of residents and invited guests of a duplex owned by the residents; or |
51 |
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| 2 |
2. Offices, mercantile, food preparation for off-site consumption, personal care salons or simil
uses which are conducted primarily by the occupants of the dwelling unit and are secondary t
the use of the unit for dwelling purposes, and which do not exceed 500 square feet (46.4 m2)
EGRESS ROOF ACCESS WINDOW. A skylight or roof window designed and installed to satisfy
the Emergency Escape and Rescue Opening requirements of Section R310.2.
ENCLOSED KITCHEN. A kitchen whose permanent openings to interior adjacent spaces do not exc
a total of 60 square feet (6 m2).
Insert Facing Page 2-5 |
18 |
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| 2 |
2. At beams, girders, ducts, or other obstructions, the ceiling height shall be not less than 6 feet 4 inches (
mm) from the finished floor.
R4504.7 Stairways, handrails, and guards. Stairs, handrails, and guards shall comply with this sect
R4504.7.1 Stairway illumination. Stairways within the work area shall be provided with illumination i
accordance with Section R303.6.
R4504.7.2 Stair width. Existing stairs not otherwise being altered or modified shall be permitted to
maintain their current clear width at, above and below existing handrails.
R4504.7.3 Stair headroom. Headroom height on existing stairs being altered or modified shall not be
reduced below the existing stairway finished headroom. Existing stairs not otherwise being altered sh
be permitted to maintain the current finished headroom.
R4504.7.4 Stair landing. Landings serving existing stairs being altered or modified shall not be reduc
below the existing stairway landing depth and width. Existing stairs not otherwise being altered shall b
permitted to maintain the current landing depth and width.
R4504.7.5 Stair treads and risers. An existing stairway shall not be required to comply with Section
R311.7.5 where the existing space and construction does not allow a reduction in pitch or slope. Whe
risers are added to an existing stair, the tread and riser dimensions of the added risers shall match th
existing stair. |
136 |
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| 2 |
2. Dampers including exhaust, intake, makeup air, backdraft and flue dampers shall be close
but not sealed beyond intended infiltration control measures. |
142 |
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| 2 |
2. Whole-house mechanical ventilation system shall be provided with controls that enable ma
override off of the system by the occupant during periods of poor outdoor air quality. Controls
shall include permanent text or a symbol indicating their function. Recommended control
permanent labeling to include text similar to the following: "Leave on unless outdoor air qualit
very poor." Manual controls shall be readily accessible by the occupant; |
108 |
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| 2 |
2. Townhouse buildings containing no more than four townhouse units.
R313.1.1 Design and installation. Automatic residential fire sprinkler systems for a townhouse unit s
be designed and installed in accordance with Section P2904 or NFPA 13D.
R313.2 One- and two-family dwellings automatic sprinkler systems. This section is not adopted. |
47 |
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| 2 |
2. Tightfitting ceramic glass or metal doors. Flue dampers, when provided, shall have an exte
control and when in the closed position shall have a net free area of not less than five percen
the flue cross sectional area.
Insert Facing Page 10-5 |
94 |
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| 2 |
2. Not less than 3 feet (914 mm) from gravity air intake openings, operable windows and door |
106 |
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| 2 |
2. The anchorage strapping shall be in accordance with the appliance manufacturer's
recommendations.
Seismic anchorage and strapping of water heaters shall be in accordance with Section 507.2 of the st
plumbing code.
Insert Facing Page 13-3 |
102 |
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| 2 |
2. An outside source for combustion air ducted into the firebox. The duct shall be at least 6
square inches (3870 mm2), and shall be provided with an operable outside air duct damper. |
93 |
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| 2 |
2. Flexible traps and tailpieces, unless listed for the specific application. |
134 |
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| 2 |
2. Factory-made ducts shall be listed and labeled in accordance with UL 181 and installed in
accordance with the manufacturer's instructions. |
114 |
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| 2 |
2. Remote mounted fans need not meet sound requirements. To be considered for this exception, a remot
mounted fan shall be mounted outside the kitchen, and there shall be at least 4 feet (1 m) of ductwork bet
the fan and the intake grille.
Insert Page 15-4 #4 / 15-5 #1
Insert Facing Insert Page 15-5 #2 |
110 |
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| 2 |
2. Custom exterior windows and doors manufactured by a small business shall be exempt from all testing
requirements in Section R609 provided they meet the applicable provisions of Chapter 24 of the Internatio
Building Code.
Insert Facing Page 6-179 |
84 |
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| 2 |
2. Installation of rooftop-mounted photovoltaic (PV) panel systems weighing 4 pounds per square foot or le
over an existing single layer of roof covering.
R4504.4.2.2 Live load increase. An increase in live load shall be determined based on Table R301.
R4504.4.2.3 Snow load increase. Snow load shall be considered to be increased for purposes of thi
section when alteration of the roof configuration creates new areas that accumulate drifted snow.
R4504.4.2.4 Wind load increase. Wind load shall be considered to be increased for purposes of this
section when the surface area of any exterior elevation subject to wind pressure is increased by more
than 5 percent.
R4504.4.2.5 Seismic load increase. Seismic load shall be considered to be increased for purposes
this section in existing buildings assigned to Seismic Design Category C, D0, D1, or D2 where new
materials replace lighter weight materials in one of the following conditions: |
135 |
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| 2 |
2. Expanded sheet metal plates not less than 0.047 inch (1.2 mm) thick. |
63 |
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| 2 |
2. Family home child care may be allowed on the second story if one of the following conditions exists: |
54 |
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| 2 |
2. Compliance with the requirements for a means of drainage, and the requirements of Sections R703.2 a
R703.4, shall not be required for an exterior wall envelope that has been demonstrated to resist wind-drive
through testing of the exterior wall envelope, including joints, penetrations and intersections with dissimilar
materials, in accordance with ASTM E 331 under the following conditions: |
88 |
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| 2 |
2. Vents and chimneys serving fuel-burning appliances shall be terminated in accordance with the applica
provisions of Chapters 18 and 24. |
39 |
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| 2 |
2. Outside each separate sleeping area in the immediate vicinity of the bedrooms. |
47 |
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| 2 |
2. Eave projections shall not be considered as obstructing the clear open space of a yard or court. |
39 |
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| 2 |
2. Copper tubing shall be joined by brazing complying with Section 605 of the state plumbing
code. |
120 |
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| 2 |
2. Smoke alarms installed in accordance with Section R314.2.2 shall be permitted to be battery powered.
R315.2 Where required. Carbon monoxide alarms shall be provided in accordance with Sections
R315.2.1 and R315.2.2.
R315.2.1 New construction. For new construction, an approved carbon monoxide alarm shall be
installed outside of each separate sleeping area in the immediate vicinity of the bedrooms in dwelling
units and on each level of the dwelling in accordance with the manufacturer’s recommendation.
R315.2.2 Alterations, repairs, and additions. Existing dwellings shall be equipped with carbon
monoxide alarms in accordance with Section R315.2.1. An inspection will occur where alterations,
repairs, or additions requiring a permit occur, or where one or more sleeping rooms are added or crea
EXCEPTIONS: |
48 |
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| 2 |
2. The solid fuel burning appliance is installed in existing construction directly on a concrete floor or surrou
by masonry materials as in a fireplace. The combustion air terminus shall be located as close to the solid f
burning appliance as possible and shall be provided with a barometric damper or equivalent. The combust
air source shall be specified by the manufacturer or no less than 4 inches (102 mm) in diameter or the
equivalent in area or as approved.
Insert Facing Page 10-11 |
96 |
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| 2 |
2. The appliance and manufacturer's recommended combustion air supply, as an installed un
shall be certified by an independent testing laboratory to have passed Test No. 11-Negative
Pressure Test, Section 12.3, of ULC S627-M1984 "Space Heaters for Use with Solid Fuels,"
modified as follows: |
96 |
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| 2 (cont. 2) |
R334.1 General. Stationary fuel cell power systems in new and existing buildings and structures shall
comply with Section 1206 of the International Fire Code.
Insert Page 3-6
Insert Facing Insert Page 3-6 |
55 |
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| 2 (cont. 2) |
R4504.7.6 Handrails and guards. Where a stair or any portion of a stair is reconstructed, a handrail
guard, where required, shall be provided in accordance with Section R311 and R312.
R4505.1 Additions to an existing building. Additions shall comply with this section and other applic
provisions of this code for new construction.
R4505.2 Structure for horizontal additions. Where an addition involves new construction next to an
attached to an existing building and includes alterations to the existing building, the addition shall me
of the requirements of this code for new construction. Alterations to the existing building shall comply
the requirements governing alterations within this code. In wood light-frame additions, connection of t
structural components shall be permitted to be provided using wall top plates and addition studs that
the existing building. Wall top plates shall be lapped and spliced in accordance with Section R602.3.2
Abutting studs shall be fastened in accordance with Table R602.3(1).
EXCEPTION:
The structural components of the addition shall be permitted to be connected to the existing building in
accordance with accepted engineering practice. |
136 |
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| 2 (cont. 2) |
R4503.2.2 Existing materials. Materials already in use in a building in compliance with requirements
approvals in effect at the time of their erection or installation shall be permitted to remain in use unles
determined by the building official to be unsafe.
R4503.2.3 Plumbing materials and supplies. The following plumbing materials and supplies shall n
be used: |
134 |
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| 2 (cont. 3) |
R4505.3 Structure for vertical additions. Where an addition involves new construction that adds a
to any part of the existing building or vertically increases the height of any part of the existing building
new construction and the existing building together shall meet all of the requirements of this code for
construction.
EXCEPTION:
Where the new structure and the existing structure together are evaluated in accordance with accepted
engineering practice and are shown to be sufficient to support the combined loads from the new structure
existing structure, no structural alterations are required.
Insert Page 45-4
Insert Facing Insert Page 45-5 |
136 |
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| 2-1 |
2-1
Chapter 3 Building Planning
WAC 51-51-0301
Section R301 – Design Criteria |
6 |
pdf_text |
| 2.1 |
2.1. Stairways from the second story open directly to the exterior of the building without entering
first floor; |
54 |
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| 2.1 |
2.1. One means of egress complying with Section R311 and one emergency escape and rescue
opening. |
41 |
pdf_text |
| 2.1 |
2.1. The manufacturer name and model number. |
112 |
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| 2.1 |
2.1. Exterior wall envelope test assemblies shall include at least one opening, one control joint,
wall/eave interface and one wall sill. All tested openings and penetrations shall be representativ
the intended end-use configuration. |
88 |
pdf_text |
| 2.1 |
2.1. Negative pressure of 8 Pascal shall be initially established with the chamber seal
and the air supply, if not directly connected to the appliance, closed off. |
96 |
pdf_text |
| 2.2 |
2.2. One of the two required means of egress discharges directly to the exterior from the second
level, and a self-closing door is installed at the top or bottom of the interior stair leading to the flo
below; or |
54 |
pdf_text |
| 2.2 |
2.2. The model is listed in the HVI, AHAM, or equivalent directory. |
112 |
pdf_text |
| 2.2 |
2.2. Exterior wall envelope test assemblies shall be at least 4 feet (1219 mm) by 8 feet (2438 m
size. |
88 |
pdf_text |
| 2.2 |
2.2. The air supply if not directly connected to the appliance, shall then be opened. |
96 |
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| 2.2 |
2.2. Two means of egress complying with Section R311. |
41 |
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| 2.3 |
2.3. A residential sprinkler system is provided throughout the entire building in accordance with |
54 |
pdf_text |
| 2.3 |
2.3. Exterior wall assemblies shall be tested at a minimum differential pressure of 6.24 pounds p
square foot (299Pa). |
88 |
pdf_text |
| 2.3 |
2.3. The rated airflow value listed in the HVI, AHAM, or equivalent directory. |
112 |
pdf_text |
| 2.3 |
2.3. The maximum allowable air exchange rate from chamber leakage and intentiona
supply for the unit (appliance with combustion air supply) in the test chamber is 3.5 ai
changes per hour, or 28 cfm (cubic feet of air per minute), whichever is less.
EXCEPTION:
Combustion air may be supplied to the room in which the solid fuel burning appliance is located in lieu of d
ducting, provided that one of the following conditions is met: |
96 |
pdf_text |
| 2.4 |
2.4. The sound rating value listed in the HVI, AHAM, or equivalent directory. |
112 |
pdf_text |
| 2.4 |
2.4. Exterior wall envelope assemblies shall be subjected to a minimum test exposure duration o
hours. |
88 |
pdf_text |
| 2.5 |
2.5. If the value for the rated airflow given in the directory is greater than or equal to t
airflow requirements specified in Section M1505.4.4.3 and if the value for the sone ra
given in the directory is less than or equal to the sone rating requirements specified i
Section M1505.4.4.2, then the local intermittent kitchen exhaust system complies,
otherwise the local intermittent kitchen exhaust system does not comply.
Insert Page 15-5 #3
Insert Facing Page 15-5 |
112 |
pdf_text |
| 20 |
20-
Chapter 21 – Hydronic piping
WAC 51-51-2101
Section M2101 – Hydronic piping systems installation |
7 |
pdf_text |
| 20 |
20 PSF Snow Load
a. The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density |
58 |
pdf_text |
| 20 |
20 cfm
M1505.4.4.2 Local exhaust fans. Exhaust fans shall meet the following criteria: |
110 |
pdf_text |
| 200 |
200 square feet (18.58 m). |
41 |
pdf_text |
| 2000 |
2000 e
≥ 3000 e
Side of
a
square
footing
(inches)
Diameter
of a
round
footing
(inches)
Thickness f
(inches)
Side of
a
square
footing
(inches)
Diameter
of a
round
footing
(inches)
Thickness f
(inches)
Side of
a
square
footing
(inches)
Diamete
of a
round
footing
(inches) |
66 |
pdf_text |
| 2001 |
2001.
R330.2 Reserved.
R330.3 Sleeping room classification. Each sleeping room in an adult family home shall be classifie |
52 |
pdf_text |
| 2021 |
2021 INTERNATIONAL RESIDENTIAL CO
First Edition
Washington State Building Code Council
First Edition Effective March 15, 2024
Insert Facing |
1 |
pdf_text |
| 2022 |
2022. The rules are effective throughout the state on March 15, 2024. This code is based on WAC |
4 |
pdf_text |
| 2024 |
2024 session.
Insert Page A-3
Insert Facing Insert Page A-4 |
4 |
pdf_text |
| 208 |
208/240-volt branch circuit shall be installed in the electrical panel for each dwelling unit. The branch
circuit shall terminate at a junction box, receptacle outlet, or electric vehicle charging equipment.
R310.1 Emergency escape and rescue opening required. Basements, habitable attics and every
sleeping room shall have not less than one operable emergency escape and rescue opening. Where
basements contain one or more sleeping rooms, an emergency escape and rescue opening shall be
required in each sleeping room. Emergency escape and rescue openings shall open directly into a pu
way, or to a yard or court providing an unobstructed path with a width of not less than 36 inches (914
that opens to a public way.
EXCEPTIONS: |
41 |
pdf_text |
| 21 |
21-
WAC 51-51-2105
Section M2105 – Ground-Source Heat-Pump System Loop Piping |
7 |
pdf_text |
| 21 |
21-
WAC 51-51-2300
Chapter 23 – Solar Thermal Energy Systems |
7 |
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| 21 |
21-
WAC 51-51-2103
Section M2103 – Floor Heating Systems |
7 |
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| 23 |
23-
Chapter 29 – Water Supply and Distribution
WAC 51-51-2904 |
7 |
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| 28 |
28
For SI: 1 inch = 25.4 mm, 1 square foot = 0.0929 m2, 1 pound per square foot = 0.0479 kPa.
a. Interpolation permitted, extrapolation not permitted.
b. Reserved.
c. Footing dimensions shall allow complete bearing of the post.
d. If the support is a brick or CMU pier, the footing shall have a minimum 2-inch projection on all sides.
e. Area, in square feet, of deck surface supported by post and footings.
f. Minimum thickness shall only apply to plain concrete footings,
Insert Facing Page 5-27 |
66 |
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| 29 |
29-
WAC 51-51-4400
Chapter 44 – Referenced Standards |
7 |
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| 296-46 |
296-46B WAC or Electrical Code as adopted by the local jurisdiction. Appendix AF, Radon Control
Methods, Appendix AQ, Tiny Homes, and Appendix AWU, Dwelling Unit Fire Sprinkler Systems, are
included in adoption of the International Residential Code.
Exceptions.
The exceptions and amendments to the International Residential Code contained in the
provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rul
The provisions of this code do not apply to temporary growing structures used solely for the
commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fru
"Temporary growing structure" means a structure that has the sides and roof covered with polyethyle
polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection
increased heat retention. A temporary growing structure is not considered a building for purposes of t
code.
The provisions of this code do not apply to the construction, alteration, or repair of temporary
worker housing except as provided by rule adopted under chapter 70.114A RCW or chapter 37, Laws |
9 |
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| 3 |
3. Cast-iron grill or grating. |
63 |
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| 3 |
3. Whole-house ventilation systems shall be configured to operate continuously except where
intermittent off controls and sizing are provided in accordance with Section M1505.4.3.2.
Insert Page 15-4 #2
Insert Facing Insert Page 15-4 #3 |
108 |
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| 3 |
3. The requirement for a means of drainage shall not be construed to mean an air space cavity under the
exterior cladding for an exterior wall clad with panel or lapped siding made of plywood, engineered wood,
hardboard, or fiber cement. A water-resistive barrier as required by Section R703.2 will be required on ext
walls.
The exterior wall envelope design shall be considered to resist wind-driven rain where the results of
testing indicate that water did not penetrate control joints in the exterior wall envelope; joints at the
perimeter of opening penetration; or intersections of terminations with dissimilar materials.
Insert Facing Page 7-7 |
88 |
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| 3 |
3
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg, NP = Not permitted.
a. Dead load = 10 psf dead load. Snow load not assumed to be concurrent with live load.
b. No. 2 grade, wet service factor included.
c. L/Δ = 360 at main span.
d. L/Δ = 180 at cantilever with 220-pound point load applied to end.
e. Includes incising factor.
f. Incising factor not included.
g. Interpolation permitted. Extrapolation not permitted.
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| 3 |
3. Bathrooms not more than 55 square feet (5.1 m2) in area |
130 |
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| 3 |
3. Clothes dryer exhaust ducts shall be terminated in accordance with Section M1502.3.
R303.5.2 Exhaust openings. Exhaust air shall not be directed onto walkways. All exhaust ducts shal
terminate outside the building. Terminal elements shall have at least the equivalent net free area of th
duct work.
R303.5.2.1 Exhaust ducts. Exhaust ducts shall be equipped with back-draft dampers. All exhaust du
in unconditioned spaces shall be insulated to a minimum of R-4.
R303.7 Interior stairway illumination. Interior stairways shall be provided with an artificial light sour
illuminate the landings and treads. Stairway illumination shall receive primary power from the building
wiring. The light source shall be capable of illuminating treads and landings to levels not less than 1 f
candle (11 lux) measured at the center of treads and landings. There shall be a wall switch at each flo
level to control the light source where the stairway has six or more risers.
EXCEPTION:
A switch is not required where remote, central or automatic control of lighting is provided.
R303.8 Exterior stairway illumination. Exterior stairways shall be provided with an artificial light sou
located at the top landing of the stairway. Stairway illumination shall receive primary power from the
building wiring. Exterior stairways providing access to a basement from the outdoor grade level shall
provided with an artificial light source located at the bottom landing of the stairway. |
39 |
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| 3 |
3. The loft is not provided with a permanent means of egress.
R333.2 Loft limitations. Lofts shall comply with the following conditions: |
55 |
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| 3 |
3. Type NS2 – Where two means of egress are at grade level or ramps constructed in
accordance with Section R330.9 are provided.
R330.4 Types of locking devices and door activation. All bedroom and bathroom doors shall be
openable from the outside when locked. Every closet shall be readily openable from the inside. Opera
parts of door handles, pulls, latches, locks, and other devices installed in adult family homes shall be
operable with one hand and shall not require tight grasping, pinching or twisting of the wrist. Pocket d
shall have graspable hardware available when in the closed or open position. The force required to
activate operable parts shall be 5.0 pounds (22.2 N) maximum. Required exit doors shall have no
additional locking devices. Required exit door hardware shall unlock inside and outside mechanisms
when exiting the building allowing reentry into the adult family home without the use of a key, tool or
special knowledge.
R330.5 Smoke and carbon monoxide alarm requirements. All adult family homes shall be equippe
with smoke and carbon monoxide alarms installed as required in Sections R314 and R315.1. Alarms
be installed in such a manner so that the detection device warning is audible from all areas of the dw
upon activation of a single alarm. |
52 |
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| 3 |
3. Solder having more than 0.2-percent lead in the repair of potable water systems.
R4503.3 Water closets. Where any water closet is replaced with a newly manufactured water closet,
replacement water closet shall comply with the requirements of Uniform Plumbing Code Section 411.
R4503.4 Structural. Repaired structural elements and systems shall comply with Section R102.7.1 a
the structural provisions of this chapter.
R4503.5 Demolition and replacement. Where a building or structure is effectively demolished by
damage or where the intended method of repair is demolition and replacement, the replaced building,
including its replaced foundation, shall comply with requirements for new construction in the Internati
Residential Code.
EXCEPTION:
Existing foundations are permitted to remain and be reused where approved by the code official.
R4504.1 General. Alterations to existing buildings shall comply with the provisions of this code for ne
construction, except as permitted by this section.
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3. Required glazed openings that face into the area under a deck, balcony, bay or floor cantilever are per
where an unobstructed pathway of not less than 36 inches (914 mm) in height, 36 inches (914 mm) in widt
and no greater than 60 inches (1524 mm) in length is provided and opens to a yard or court. The pathway
be measured from the exterior face of the glazed opening, or if the glazed opening is in a window well, at t
window well wall furthest from the exterior face of the glazed opening.
R303.10 Required heating. When the winter design temperature in Table R301.2 is below 60°F
(16°C), every dwelling unit shall be provided with heating facilities capable of maintaining a minimum
room temperature of 68°F (20°C) at a point 3 feet (914 mm) above the floor and 2 feet (610 mm) from
exterior walls in all habitable rooms at design temperature. The installation of one or more portable
heaters shall not be used to achieve compliance with this section.
EXCEPTION:
Unheated recreational tents or yurts not exceeding 500 square feet provided it is not occupied as a perma
dwelling.
Insert Facing Page |
39 |
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| 3 |
3. Owner-occupied single-family residences legally occupied before July 26, 2009. RCW 19.27.530 (2)(b).
R315.3 Location. Carbon monoxide alarms in dwelling units shall be installed outside of each separa
sleeping area in the immediate vicinity of the bedrooms and on each level of the dwelling and in
accordance with the manufacturer’s recommendations. Where a fuel burning appliance is located wit
bedroom or its attached bathroom, a carbon monoxide alarm shall be installed within the bedroom.
Insert Facing Page 3-53 |
48 |
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| 3 |
3. Not less than 10 feet (3048 mm) from mechanical air intake openings except where either
the following apply: |
106 |
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| 3 |
3. So that openings in exterior walls are flashed in accordance with Section R703.4. |
104 |
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| 3 |
3. The engineer of record determines that 50 percent, by weight, of the material in th
structure that is not concrete, is not suitable for reuse.
AWZ102 General definitions.
AWZ102.1 General. The following words and terms shall, for the purposes of this appendix, have the
meanings shown herein. Refer to Chapter 2 of this code for general definitions.
Deconstruction. The systematic disassembly of a structure, in order to salvage building materials or
components for the primary purpose of reusing materials to the maximum extent possible, with a
secondary purpose of recycling the remaining materials.
Demolition. The process of razing, relocating, or removing an existing building or structure, or a porti
thereof.
Heavy machinery. Heavy machinery includes, but is not limited to, track hoes, excavators, skid steer
loaders, or forklifts.
Recycling. The process of transforming or remanufacturing waste materials into useable or marketab
materials for use other than landfill disposal or incineration.
Reuse. The return of a material into the economic stream for use.
Salvage. The recovery of construction and demolition building material and components from
a building or site in order to increase the reuse or repurpose potential of these materials and decreas
amount of material being sent to the landfill. Salvaged material may be sold, donated, or reused. |
150 |
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| 3 |
3
Redwood f, Western Cedars f,
Ponderosa Pine f,
Red Pine f |
71 |
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| 3 |
3. Fibrous duct construction shall conform to the SMACNA Fibrous Glass Duct Construction
Standards or NAIMA Fibrous Glass Duct Construction Standards. |
114 |
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| 3 |
3. The hauler of the material; |
149 |
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| 3 |
3. A parapet is not required where roof surfaces adjacent to the wall or walls are at different
elevations and the higher roof is more than 30 inches (762 mm) above the lower roof. The
common wall construction from the lower roof to the underside of the higher roof deck shall h
not less than a 1-hour fire-resistance rating. The wall shall be rated for exposure from both si
R302.3 Two-family dwellings. Wall and floor/ceiling assemblies separating dwelling units in two-fam
dwellings shall be constructed in accordance with Section R302.3.1 through R302.3.5. One accessor
dwelling unit constructed within an existing dwelling unit need not be considered a separated dwelling
in a two-family dwelling where all required smoke alarms, in the accessory dwelling unit and the prim
dwelling unit, are interconnected in such a manner that the actuation of one alarm will activate all alar
in both the primary dwelling unit and the accessory dwelling unit.
R302.3.1 Separation.Dwelling units in two-family dwellings shall be separated from each other by wa
and floor assemblies having not less than a 1-hour fire-resistance rating where tested in accordance
ASTM E119, UL 263 or Section 703.2.2 of the International Building Code.
EXCEPTIONS: |
34 |
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| 3 |
3. On each additional story of the dwelling, including basements and habitable attics but not
including crawl spaces and uninhabitable attics. In dwellings or dwelling units with split levels
without an intervening door between the adjacent levels, a smoke alarm installed on the uppe
level shall suffice for the adjacent lower level provided that the lower level is less than one full
story below the upper level. |
47 |
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| 3 |
3. Provide a label on the installed system containing the contact information for the qualified
maintenance and service providers.
R328.12.1 Installation prior to closing. Where the system is installed in a one- or two-family dwellin
townhouse unit that is owned by the builder and has yet to be sold, commissioning shall be conducte
outlined in Section R328.12, and the builder shall then transfer the required information in Section
R328.12 to the homeowner when the property is transferred to the owner at the closing.
Insert Facing Page |
51 |
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| 3 |
3. Operated exclusively for physical therapy or rehabilitation and under the supervision of a
licensed medical practitioner.
R328.2 Equipment listings. ESS shall be listed and labeled for residential use in accordance with U |
51 |
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| 3 |
3. In areas with ceiling heights of 7 feet (2134 mm) or less in lofts constructed in accordance with Section
R333, guards shall not be less than 36 inches (914 mm) in height or one-half of the clear height from
the loft floor to the loft ceiling, whichever is less.
Insert Facing Page 3-51 |
46 |
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| 3 |
3. One of the two required means of egress is an operable window or door, approved for
emergency escape or rescue, that opens directly to a public street, public alley, yard or exit c
or |
54 |
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| 3 |
3. A yard shall not be required to open directly into a public way where the yard opens to an unobstructed
from the yard to the public way. Such path shall have a width of not less than 36 inches (914 mm). The
following shall not be considered obstructions: |
41 |
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| 3 |
3. Battery systems less than 1 kWh (3.6 megajoules).
R328.12 Commissioning. ESS shall be commissioned as follows: |
51 |
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| 3 |
3. Polybutylene pipe and tubing joints shall be installed with socket-type heat-fused polybutyl
fittings. |
120 |
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| 3 |
3. Design and installation of the system or equipment shall be carried out in accordance with
manufacturers' installation instructions. |
110 |
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| 3 |
3. Site built fireplaces shall have tightfitting glass or metal doors, or a flue draft induction fan
approved for minimizing back-drafting. Factory built fireplaces shall use doors listed for the
installed appliance.
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93 |
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| 3 |
3. To an imaginary line between two buildings on the lot.
The distance shall be measured at a right angle from the wall.
Insert Facing Pag |
19 |
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| 3 |
3. Interior doors, if installed at the time of the test, shall be open. |
142 |
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| 3 (cont. 2) |
R303.9 Required glazed openings. Required glazed openings shall open directly onto a street or pu
alley, or a yard or court located on the same lot as the building.
EXCEPTIONS: |
39 |
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| 3 (cont. 2) |
AWZ103 Deconstruction.
AWZ103.1 Deconstruction. Buildings and structures meeting the requirements of Section AZ101.2 s
be deconstructed.
AWZ103.2 Heavy machinery. Heavy machinery may not be used in deconstruction to remove or
dismantle components of buildings and structures in ways that render the components unsuitable for
salvage.
Insert Page AZ-1
Insert Facing Page Index-1 |
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| 3 (cont. 2) |
R330.6 Escape windows and doors. Every sleeping room shall be provided with emergency escape
and rescue windows as required by Section R310. No alternatives to the sill height such as steps, rai
platforms or other devices placed by the openings will be approved as meeting this requirement.
R330.7 Fire apparatus access roads and water supply for fire protection. Adult family homes sh
served by fire apparatus access roads and water supplies meeting the requirements of the local
jurisdiction.
R330.8 Grab bar general requirements. Where facilities are designated for use by adult family hom
clients, grab bars for water closets, bathtubs, and shower stalls shall be installed according to this
section.
R330.8.1 Grab bar cross section. Grab bars with a circular cross section shall have an outside diam
of 1 1/4 inch (32 mm) minimum and 2 inches (50 mm) maximum. Grab bars with noncircular cross se
shall have a cross section dimension of 2 inches (50mm) maximum and a perimeter dimension of 4
inches (102 mm) minimum and 4 5/8 inches maximum.
Insert Page 3-67 #1
Insert Facing Insert Page 3-67 #2 |
52 |
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| 3-1 |
3-1
WAC 51-51-0302
Section R302 – Fire-Resistant Construction |
6 |
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| 3-3 |
3-3
WAC 51-51-0307
Section R307 – Toilet, bath and shower spaces |
6 |
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| 3-3 |
3-3
WAC 51-51-0303
Section R303 – Light, Ventilation and Heating |
6 |
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| 3-4 |
3-4
WAC 51-51-0312
Section R312 – Guards and Window Fall Protection |
6 |
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| 3-4 |
3-4
WAC 51-51-0311
Section R311 – Means of Egress |
6 |
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| 3-4 |
3-4
WAC 51-51-0309
Section R309 – Garages and Carports |
6 |
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| 3-4 |
3-4
WAC 51-51-03100
Section R310 – Emergency Escape and Rescue Openings |
6 |
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| 3-5 |
3-5
WAC 51-51-0313
Section R313 – Automatic Fire Sprinkler Systems |
6 |
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| 3-5 |
3-5
WAC 51-51-0315
Section R315 – Carbon Monoxide Alarms |
6 |
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| 3-5 |
3-5
WAC 51-51-0314
Section R314 – Smoke Alarms and Heat Detection |
6 |
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| 3-5 |
3-5
WAC 51-51-03240
Section R324 – Solar Energy Systems |
6 |
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| 3-6 |
3-6
WAC 51-51-0330
Section R330 – Adult Family Homes |
6 |
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| 3-6 |
3-6
WAC 51-51-0334
Section R334 – Stationary Fuel Cell Power Systems |
6 |
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| 3-6 |
3-6
WAC 51-51-0332
Section R332 – Protection Against Radon |
6 |
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| 3-6 |
3-6
WAC 51-51-0325
Section R325 – Mezzanines |
6 |
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| 3-6 |
3-6
WAC 51-51-0331
Section R331 – Family Home Child Care |
6 |
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| 3-6 |
3-6
WAC 51-51-0326
Section R326 – Habitable Attics |
6 |
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| 3-6 |
3-6
WAC 51-51-0333
Section R333 – Lofts |
6 |
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| 3-6 |
3-6
WAC 51-51-0327
Section R327 – Swimming Pools, Spas, and Hot Tubs |
6 |
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| 3-6 |
3-6
WAC 51-51-0328
Section R328 – Energy Storage Systems |
6 |
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| 3-6 |
3-6
Chapter 4 Foundations
WAC 51-51-0403
Section R403 – Footings |
6 |
pdf_text |
| 3.1 |
3.1. The exhaust opening is located not less than 3 feet (914 mm) above the air intak
opening. |
106 |
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| 3.1 |
3.1. Gates with operational constraints and opening control devices without the use of keys, tool
special knowledge. |
41 |
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| 3.1 |
3.1. The aggregate area of the unprotected portions shall not exceed 80 square feet (7.4 m2) pe
story. |
38 |
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| 3.2 |
3.2. The exhaust opening is part of a factory-built intake/exhaust combination termina
fitting installed in accordance with the manufacturer's instructions, and the exhaust ai
drawn from a living space. |
106 |
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| 3.2 |
3.2. Fire blocking in accordance with Section R302.11.1 is installed along the perimeter of the
unprotected portion to separate the unprotected portion from the remainder of the floor assembl |
38 |
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| 3.2 |
3.2. Window wells equipped with a removable cover complying with Section R310.4.4.
R310.2.4 Emergency escape and rescue openings under decks, porches, and
cantilevers. Emergency escape and rescue openings installed under decks, porches, and cantilever
shall be fully openable and provided with an unobstructed pathway of not less than 36 inches (914 m
height, 36 inches (914 mm) in width, and no greater than 60 inches (1524 mm) in length that opens to
yard or court. The pathway shall be measured from the exterior face of the glazed opening, or if the
glazed opening is in a window well, at the window well wall furthest from the exterior face of the glaze
opening.
Insert Facing Page |
41 |
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| 30 |
30 PSF Snow Load
a. The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density |
59 |
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| 30 |
30 inches (762 mm) above the lower roof surface.
EXCEPTION:
A parapet is not required in the preceding two cases where the roof covering complies with a minimum Cla
rating as tested in accordance with ASTM E108 or UL 790 and the roof decking or sheathing is of
noncombustible materials or fire retardant-treated wood for a distance of 4 feet (1219 mm) on each side of
wall or walls, or one layer of 5/8-inch (15.9 mm) Type X gypsum board is installed directly beneath the roof
decking or sheathing, supported by not less than nominal 2-inch (51 mm) ledgers attached to the sides of t
roof framing members, for a distance of not less than 4 feet (1219 mm) on each side of the wall or walls an
any openings or penetrations in the roof are not within 4 feet (1219 mm) of the common walls. Fire retarda
treated wood shall meet the requirements of Sections R802.1.5 and R803.2.1.2. |
34 |
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| 34 |
34—2019: Designation and Safety Classification of Refrigerants.
M1411.1 |
132 |
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| 36 |
36 inches (914 mm) horizontally to the edge of the open side. Insect screening shall not be considere
a guard.
R312.1.2 Height. Required guards at open-sided walking surfaces, including stairs, porches, balconi
landings, shall be not less than 36 inches (914 mm) in height as measured vertically above the adjac
walking surface or the line connecting the nosings.
EXCEPTIONS: |
46 |
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| 36 |
36 inches (914 mm) above floor grade. Control end and head end grab bars shall be 24 inches (610
minimum in length. Back wall grab bar shall be 36 inches (914 mm) minimum in length.
R330.8.5 Grab bars at shower stalls. Where shower stalls are provided to meet the requirements fo
bathing facilities, grab bars shall meet the requirements of Section R330.8.
EXCEPTION:
Shower stalls with permanent built-in seats are not required to have vertical or horizontal grab bars at the
end wall. A vertical floor to ceiling grab bar shall be installed within 4 inches of the exterior of the shower al
with the nose of the built-in seat.
R330.8.5.1 Vertical grab bars. Vertical grab bars shall be 18 inches (457 mm) minimum in length an
installed at the control end wall and head end wall. Vertical bars shall be mounted within 4 inches (10
mm) of the exterior of the shower stall or within 4 inches (102 mm) inside the shower stall. The botto
end of vertical bars mount between 36 inches (914 mm) and 42 inches (1067 mm) above floor grade.
R330.8.5.2 Horizontal grab bars. Horizontal grab bars shall be installed on all sides of the shower st
mounted between 33 inches (838 mm) and 36 inches (914 mm) above the floor grade. Horizontal gra
bars shall be a maximum of 6 inches (152 mm) from adjacent walls. Horizontal grab bars shall not
interfere with shower control valves.
Insert Page 3-6
Insert Facing Insert Page 3-6 |
53 |
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| 4 |
4. So as to protect the potable water supply in accordance with Section 603 of the state plum
code. |
104 |
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| 4 |
4. Field-fabricated and shop-fabricated metal and flexible duct constructions shall conform to
SMACNA HVAC Duct Construction Standards—Metal and Flexible, except as allowed by Ta
M1601.1.1. Galvanized steel shall conform to ASTM A 653. |
114 |
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| 4 |
4. Garages; carports; exterior porches; unheated entry areas, such as mud rooms, that are adjacent to an
exterior door; and similar areas.
Insert Facing Page 29-9 |
130 |
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| 4 |
4. CPVC tubing shall be joined using solvent cement joints. |
120 |
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| 4 |
4. Intermittent local exhaust systems serving kitchens shall be rated for sound at a maximum
sones at one or more airflow settings not less than 100 cfm at a static pressure not less than
determined at working speed as specified in HVI 916 Section 7.2. |
110 |
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| 4 |
4. The receiving facility or location; and |
149 |
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| 4 |
4. A residential sprinkler system is provided throughout the entire building in accordance with
NFPA 13d.
Floors located more than 4 feet above grade level shall not be occupied by children in family home ch
care.
EXCEPTIONS: |
54 |
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| 4 |
4. Smoke alarms shall be installed not less than 3 feet (914 mm) horizontally from the door or
opening of a bathroom that contains a bathtub or shower unless this would prevent placemen
a smoke alarm required by Section R314.3. |
47 |
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| 4 |
4. Extruded load-bearing brick vents. |
63 |
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| 4 |
4. Openings shall comply with Sections R303.5.2 and R303.6.
M1505.1 General. Where local exhaust or whole-house mechanical ventilation is provided, the ventil
system shall be designed in accordance with this section.
EXCEPTION:
Alternate balanced whole-house ventilation systems and local exhaust systems designed and commission
accordance with ASHRAE 62.2 are permitted.
M1505.4 Whole-house mechanical ventilation system. Each dwelling unit shall be equipped with a
ventilation system. The whole-house mechanical ventilation systems shall be designed in accordance
with Sections M1505.4.1 through M1505.4.4.
Insert Facing Page 15-3 |
106 |
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| 4 |
4. Exterior louvers for continuous ventilation systems and heat recovery ventilators shall be
closed and sealed. |
142 |
pdf_text |
| 4 |
4. Wood floor assemblies using dimension lumber or structural composite lumber with a cross sectional ar
equal to or greater than 2-inch by 10-inch (50.8 mm by 254 mm) nominal dimension, or other approved floor
assemblies demonstrating equivalent fire performance.
R303.1 Natural light. All habitable rooms shall have an aggregate glazing area of not less than 8 per
of the floor area of such rooms.
EXCEPTION:
The glazed areas need not be installed in rooms where artificial light is provided capable of producing an
average illumination of 6 footcandles (65 lux) over the area of the room at a height of 30 inches (762 mm)
above the floor level.
R303.2 Adjoining rooms. For the purpose of determining light requirements, any room shall be
considered as a portion of an adjoining room when at least one-half of the area of the common wall is
open and unobstructed and provides an opening of not less than one-tenth of the floor area of the int
room but not less than 25 square feet (2.3 m2).
EXCEPTION:
Openings required for light shall be permitted to open into a sunroom with thermal isolation or a patio cove
provided there is an openable area between the adjoining room and the sunroom or a patio cover of not le
than one-tenth of the floor area of the interior room but not less than 20 square feet (2 m2).
Insert Facing Page 3-39 |
38 |
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| 4-2 |
4-2
WAC 51-51-0408
Section R408 – Under Floor Space |
6 |
pdf_text |
| 4-4 |
4-4
Chapter 5 Floors
WAC 51-51-0507
Section R507 – Decks |
6 |
pdf_text |
| 44 |
44-
Insert Page
Insert Facing Insert Page |
7 |
pdf_text |
| 45 |
45-
WAC 51-51-4502
Section R4502 – Compliance |
8 |
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| 45 |
45-
WAC 51-51-4505
Section R4505 – Additions |
8 |
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| 45 |
45-
WAC 51-51-4503
Section R4503 – Repairs |
8 |
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| 45 |
45-
WAC 51-51-4506
Section R4506 – Relocations |
8 |
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| 45 |
45-
WAC 51-51-4504
Section R4504 – Alterations |
8 |
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| 45 |
45-
Appendix F – Radon Control Methods
WAC 51-51-60101
Section AF101 – Scope
AF-
WAC 51-51-60103
Section AF103 – Requirements
AF-
WAC 51-51-60104
Appendix Q – Tiny Houses
AQ
WAC 51-51-60105
Appendix U – Dwelling Unit Fire Sprinkler Systems
AU
WAC 51-51-60106
Appendix T – Solar-ready provisions:
Detached One- and Two-Family Dwellings and Townhouses
AT-
WAC 51-51-60107
Appendix V – Fire Sprinklers
AV
WAC 51-51-60108
Appendix Y – Construction and Demolition Material Management
AY
WAC 51-51-60109
Appendix Z – Building Deconstruction
AZ-
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| 5 |
5 or
Airflow in cfm
< 500 |
109 |
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| 5 |
5. In napping areas in a family home child care. |
47 |
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| 5 |
5. Use of gypsum products to construct return air ducts or plenums is permitted, provided tha
air temperature does not exceed 125°F (52°C) and exposed surfaces are not subject to
condensation. |
114 |
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| 5 |
5. Continuous local exhaust systems serving kitchens shall be rated for sound at a maximum
sones at one or more airflow settings not less than 100 cfm at a static pressure not less than
determined at working speed as specified in HVI 916 Section 7.2.
EXCEPTIONS: |
110 |
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| 5 |
5. Polypropylene pipe and tubing joints shall be installed with socket-type heat-fused
polypropylene fittings. |
120 |
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| 5 |
5. The date materials were accepted by the receiving facility or location.
Insert Page
Insert Facing Insert Page |
149 |
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| 5 |
5. Hardware cloth of 0.035 inch (0.89 mm) wire or heavier. |
63 |
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| 5 |
5. So that air intake opening locations are in accordance with Section R303.5.1.
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104 |
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| 5 |
5 ACH based on kitchen volu
Bathrooms - Toilet rooms 50 cfm |
110 |
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| 5 |
5. Heating and cooling systems, if installed at the time of the test, shall be turned off. |
142 |
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| 5 |
5 feet (1524 mm) and not less than 50 percent of the required floor area shall have a ceiling height of not l
than 6 feet 8 inches (2134 mm). |
136 |
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| 5-2 |
5-2
Chapter 6 Wall Construction
WAC 51-51-0602
Section R602 – Wood Wall Framing |
6 |
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| 50 |
50 PSF Snow Load
a. The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density |
60 |
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| 51-11 |
51-11R WAC) for new buildings or structures.
EXCEPTION:
Group R-3 buildings or structures are not required to comply if: |
11 |
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| 51-51 |
51-51 as published in WSR 23-23-104. It is subject to review by the State Legislature during the |
4 |
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| 6 |
6. In the hallway and in the room open to the hallway in dwelling units where the ceiling heigh
a room open to a hallway serving bedrooms exceeds that of the hallway by 24 inches (610 m
or more. |
47 |
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| 6 |
6. Cross-linked polyethylene (PEX) tubing shall be joined using cold expansion, insert or
compression fittings. |
120 |
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| 6 |
6, and 8. Existing structural components that do not provide support for the increased loads shall not
required to comply with this section.
R4504.4.2.1 Dead load increase. Dead load shall be considered to be increased for purposes of this
section when the weight of materials used for the alteration exceeds the weight of the materials repla
or when new materials or elements are added.
EXCEPTIONS: |
135 |
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| 6 |
6. Corrosion-resistant wire mesh, with the least dimension being 1/8 inch (3.2 mm).
EXCEPTION:
The total area of ventilation openings shall be permitted to be reduced to 1/1,500 of the under-floor area w
the ground surface is covered with an approved Class I vapor retarder material and the required openings
placed to provide cross ventilation of the space. The installation of operable louvers shall not be prohibited
the installed ventilation is less than 1/300, or if operable louvers are installed, a radon vent shall be installe
originate from a point between the ground cover and soil. The radon vent shall be installed in accordance
the requirements of Appendix AF (Radon) of this code.
R408.3 Unvented crawl space. Ventilation openings in under-floor spaces specified in Section R408
shall not be required where: |
63 |
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| 6 |
6. Supply and return registers, if installed at the time of the test, shall be fully open.
AQ104.1.1 Whole-house mechanical ventilation. Where an air leakage rate not exceeding 0.30 cf
ft of the dwelling unit enclosure area in accordance with Section AQ106.1 is provided, the tiny house
be provided with whole-house mechanical ventilation in accordance with Section M1505.4.
AQ105 Emergency escape and rescue openings. This section is not adopted.
AQ106 Energy conservation. This section is not adopted.
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| 6 |
6. Duct systems shall be constructed of materials having a flame spread index not greater tha |
114 |
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| 6-1 |
6-1
WAC 51-51-0609
Section R609 – Exterior Windows and Doors |
6 |
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| 6-1 |
6-1
Insert Page TC-1
Insert Facing Insert Page TC-2 |
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| 6-5 |
6-5
NP
NP
NP |
67 |
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| 60 |
60 Live or |
66 |
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| 60 |
60 Live Load,
≤60 Ground
Snow Load
Douglas Firee, Hem-firee, SPF
e |
67 |
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| 60 |
60 Live
Load or |
71 |
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| 62.2-2019 |
62.2-2019: Ventilation and Acceptable Indoor Air Quality in Residential Buildings.
M1505.1
ASTM
E2556/ E2556M-2010 (2016): Standard Specification for Vapor Permeable Flexible Sheet Water-
Resistive Barriers Intended for Mechanical Attachment.
M1411.1
E2558-2013: Standard Test Method for Determining Particulate Matter Emissions from Fires in
Wood-burning Fireplaces.
R1004.1.1
E3087—18: Standard Test Method for Measuring Capture Efficiency of Domestic Range Hoods
M1505.4.4.3.2, Table M1505.4.4.3
CSA
CAN/CSA/C22.2 No. 60335-2-40—2012 60335-2-40—2019
NMX-J-521/2-40-ANCE—2019/CAN/CSA-C22.2 No. 60335-2-40—19/UL 60335-2-40-2019 Househ
and Similar Electric Appliances, Part 2-40-Safety: Particular Requirements for Electric Heat
Pumps, Air-Conditioners and Dehumidifiers.
M2006.1
HVI
HVI Publication 911: Certified Home Ventilation Products Directory.
M1505.4.4.3.1
HVI Publication 915 (2016 with 2020 Update): Procedure for Loudness Rating of Residential Fa
Products.
M1505.4.1.2, M1505.4.1.3, M1505.4.4.2
HVI Publication 916 (2015 with 2020 Update): Air Flow Test Procedure.
M1505.4.1.2, M1505.4.1.3, M1505.4.4.2
HVI Publication 920 (2020): Product Performance Certification Procedure Including Verificatio
and Challenge.
M1505.4.1.2, M1505.4.1.3, M1505.4.1.5, M1505.4.4.2
UL
UL/CSA/ANCE 60335-2-40—2019 Household and Similar Electrical Appliances Safety-Part 2-40
Particular Requirements for Electrical Heat Pumps, Air Conditioners and Dehumidifiers.
M1403.1, M1412.1, M141 |
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| 62.2-2019 (cont. 3) |
Insert Facing Page 44-1 |
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| 65 |
65% CE or 160 cfm |
111 |
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| 7 |
7. Raised temperature polyethylene (PE-RT) tubing shall be joined using insert or compressi
fittings.
Insert Facing Page 21-1 |
120 |
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| 7 |
7. Stud wall cavities and the spaces between solid floor joists shall not be used as a duct or a
plenum in new construction. For existing systems, stud wall cavities and the spaces between
solid floor joists to be used as air plenums shall comply with the following: |
114 |
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| 7 |
7. Within the room to which a loft is open, in the immediate vicinity of the loft.
Insert Facing Page |
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| 7-0 |
7-0
NP
NP
NP |
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| 7-1 |
7-1
WAC 51-51-0703
Section R703 – Exterior Covering |
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| 7-7 |
7-7
Chapter 9 –Roof Assemblies
WAC 51-51-0903
Section R903 – Weather Protection |
7 |
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| 7-9 |
7-9
For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 pound per square foot = 0.0479 kPa, 1 pound = 0.454 kg.
a. Interpolation allowed. Extrapolation is not allowed.
b. Beams supporting a single span of joists with or without cantilever.
c. Dead load = 10 psf, L/Δ = 360 at mainspan, L/Δ = 180 at cantilever. Snow load not assumed to be concurrent with live load.
d. No. 2 grade, wet service factor included.
e. Beam depth shall be equal to or greater than the depth of intersecting joist for a flush beam connection.
f. Beam cantilevers are limited to the adjacent beam's span divided by 4.
g. Includes incising factor.
h. Incising factor not included.
i. Deck joist span as shown in Figure R507.6 .
j. For calculation of effective joist span, the actual joist span length shall be multiplied by the joist span factor in accordance wit
Table R507.5(5).
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| 7.1 |
7.1. These cavities or spaces shall not be used as a plenum for supply air. |
114 |
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| 7.2 |
7.2. These cavities or spaces shall not be part of a required fire-resistance-rated
assembly. |
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| 7.3 |
7.3. Stud wall cavities shall not convey air from more than one floor level. |
114 |
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| 7.4 |
7.4. Stud wall cavities and joist-space plenums shall be isolated from adjacent conce
spaces by tight-fitting fire blocking in accordance with Section R302.11. Fireblocking
materials used for isolation shall comply with Section R302.11.1. |
114 |
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| 7.5 |
7.5. Stud wall cavities in the outside walls of building envelope assemblies shall not b
utilized as air plenums.
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| 70 |
70 PSF Snow Load
a. The minimum footing size is based on the following assumptions: Material weights per Section R301.2.2.2.1 and soil density |
61 |
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| 70 |
70 Ground
Snow
Load |
66 |
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| 70 |
70 Ground
Snow Load
Douglas fir-larch e, Hem-fir e,
Spruce-pine-fir e |
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| 70 |
70 Ground
Snow Load
Douglas Firee, Hem-firee, SPF
e |
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| 70 |
70 PSF GROUND SNOW LOAD c
BEAM SPECIES d
BEAM SIZE e
EFFECTIVE DECK JOIST SPAN
(feet) |
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| 8-1 |
8-1
Redwood h, Western Cedars h, Ponderosa
Pine h, Red Pine h |
70 |
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| 80 |
80% CE or 250 cfm
Insert Page 15-
Insert Facing Insert Page 15-4 #4 / 15- |
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| 828 |
828. Fluxes for soldering shall be in accordance with ASTM B 813. Brazing fluxes shall be in accorda
with AWS A5.31. Piping joints that are embedded shall be installed in accordance with the following
requirements: |
120 |
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| 9-1 |
9-1
Chapter 10 Chimneys and Fireplaces
WAC 51-51-1001
Section R1001 – Masonry Fireplaces |
7 |
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| 90 |
90
M1505.4.3.1 Ventilation quality adjustment. The minimum whole-house ventilation rate from Sectio |
109 |
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| Section 2904 |
Section 2904 – Dwelling Unit Fire Sprinkler Systems |
7 |
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| Section 314 |
Section 314 – Smoke Alarms and Heat Detection
R314.1 General. Smoke alarms, heat detectors, and heat alarms shall comply with NFPA 72 and this
section.
R314.1.1 Listings. Smoke alarms shall be listed in accordance with UL 217. Heat detectors and heat
alarms shall be listed for the intended application. Combination smoke and carbon monoxide alarms
be listed in accordance with UL 217 and UL 2034.
R314.2 Where required. Smoke alarms, heat detectors, and heat alarms shall be provided in accord
with this section.
R314.2.1 New construction. Smoke alarms shall be provided in dwelling units. A heat detector or he
alarm shall be provided in new attached garages.
R314.2.2 Alterations, repairs and additions. Where alterations, repairs or additions requiring a per
occur, or where one or more sleeping rooms are added or created in existing dwellings, or where an
accessory dwelling unit is created within an existing dwelling unit, each dwelling unit shall be equippe
with smoke alarms as required for new dwellings.
EXCEPTIONS: |
47 |
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| Section 507.2 |
Section 507.2.
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R311.7.11 Alternating tread devices. Alternating tread devices shall not be used as an element of a
means of egress. Alternating tread devices shall be permitted provided that a required means of egre
stairway or ramp serves the same space at each adjoining level or where a means of egress is not
required. The clear width at and below the handrails shall be not less than 20 inches (508 mm).
EXEPTION:
Not adopted
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Appendix T—Solar-ready provisions-detached one- and two-family dwellings and townhouses
The provisions contained in this appendix are not mandatory unless specifically referenced in the
adopting ordinance.
AT102 General definitions.
AT102.1 General. The following term shall, for the purpose of this appendix, have the meaning show
herein.
Solar-ready zone. A section or sections of the roof or building overhang designated and reserved for
future installation of a solar photovoltaic or solar water-heating system.
AT103.3 Solar-ready zone area. The total solar-ready zone area shall be not less than 300 square f
(27.87 m2) exclusive of mandatory access or set back areas as required by this code. New townhous
three stories or less in height above grade plane and with a total floor area less than or equal to 2,000
square feet (185.8 m2) per dwelling shall have a solar-ready zone area of not less than 150 square fe
(13.94 m2). The solar-ready zone shall be composed of areas not less than 5 feet (1.52 m) in width a
not less than 80 square feet (7.44 m2) exclusive of access or set back areas as required in this code
the applicable provisions of the International Fire Code. No portion of the solar zone shall be located
roof slope greater than 2:12 that faces within 45 degrees of true north. |
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CONDITIONED SPACE. An area, room or space that is enclosed within the building thermal envelop
and that is directly or indirectly heated or cooled. Spaces are indirectly heated or cooled where they
communicate through openings with conditioned spaces, where they are separated from conditioned
spaces by uninsulated walls, floors or ceilings, or where they contain uninsulated ducts, piping or oth
sources of heating or cooling.
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EXCEPTION:
Common walls are permitted to extend to and be tight against the interior side of the exterior walls if the ca
between the end of the common wall and the exterior sheathing is filled with a minimum of 2-inch nominal
thickness wood studs.
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TABLE R302.1(1)
EXTERIOR WALLS
No Change to the Table
a. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave
overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing.
b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake
overhang where ventilation openings are not installed in the rake overhang or in walls that are comm
attic areas. |
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R311.4 Vertical egress. Egress from habitable levels including habitable attics and basements not
provided with an egress door in accordance with Section R311.2 shall be by a ramp in accordance wi
Section R311.8 or a stairway in accordance with Section R311.7.
EXCEPTION:
Stairways, alternating tread devices, ship’s ladders, or ladders within an individual dwelling unit or sleeping
used for access to areas of 200 square feet (18.6 m2) or less, are exempt from the requirements of Sectio
R311.4 and R311.7, where such devices do not provide exclusive access to a kitchen or bathroom. Such
shall not be located more than 10 feet (3048 mm) above the finished floor of the space below.
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Section M2005.1 General. Water heaters shall be installed in accordance with Chapter 5 of the state
plumbing code, the manufacturer's instructions and the requirements of this code. Water heaters inst
in an attic shall comply with the requirements of Section M1305.1.2. Gas-fired water heaters shall co
with the requirements in Chapter 24. Domestic electric water heaters shall comply with UL 174. Oil-fir
water heaters shall comply with UL 732. Thermal solar water heaters shall comply with Chapter 23 an
UL 174. Solid fuel-fired water heaters shall comply with UL 2523.
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M2105.18 Protection of potable water. Where ground-source heat-pump ground-loop systems have
connection to a potable water supply, the potable water system shall be protected from backflow in
accordance with Section 603 of the state plumbing code.
M2105.19 Pipe penetrations. Openings for pipe penetrations in walls, floors and ceilings shall be lar
than the penetrating pipe. Openings through concrete or masonry building elements shall be sleeved.
annular space surrounding pipe penetrations shall be protected in accordance with Section 312 of the
state plumbing code.
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M1201.1 Scope. The provisions of Chapters 12 through 24 shall regulate the design, installation,
maintenance, alteration and inspection of mechanical systems that are permanently installed and utili
to provide control of environmental conditions within buildings. These chapters shall also regulate tho
mechanical systems, system components, equipment and appliances specifically addressed in this c
EXCEPTION:
The standards for liquefied petroleum gas installations shall be the 2011 Edition of NFPA 58 (Liquefied
Petroleum Gas Code) and the 2012 Edition of ANSI Z223.1/NFPA 54 (National Fuel Gas Code).
M1201.3 Construction documents. The plans and specifications shall show in sufficient detail pertin
data and features of the materials, equipment and systems as herein governed including, but not limit
to: Design criteria, size and type of apparatus and equipment, systems and equipment controls,
provisions for combustion air to fuel burning appliances, and other pertinent data to indicate conforma
with the requirements of this code. |
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R507.9.1.2 Band joist details. Band joists supporting a ledger shall be a minimum 2-inch-nominal (5
mm), solid-sawn, spruce-pine-fir or better lumber or minimum 1-inch (25 mm) nominal engineered wo
rim boards in accordance with Section R502.1.7. Band joists shall bear fully on the primary structure
capable of supporting all required loads.
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Chapter 45—Existing buildings and structures.
R4501 Scope and purpose.
R4501.1 General. Repairs, alterations, additions, and relocation of existing buildings and structures s
comply with the provisions of this code for new construction, except as modified by this chapter. Struc
elements and systems shall comply with Section R102.7.1 and the provisions of this chapter.
R4502.1 General. The work shall not cause the building or structure to become unsafe or adversely
affect the performance of the building; shall not cause an existing mechanical or plumbing system to
become unsafe, hazardous, insanitary, or overloaded; and unless expressly permitted by these
provisions, shall not make the building any less compliant with this code or to any previously approve
alternative arrangements than it was before the work was undertaken.
R4502.2 Structural. Structural elements and systems that are altered, repaired, or replaced shall co
with the structural provisions of this chapter and of Chapter 3 through Chapter 10 of the International
Residential Code unless noted otherwise. |
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R702.5 Other finishes. Wood veneer paneling and hardboard paneling shall be placed on wood or c
formed steel framing spaced not more than 16 inches (406 mm) on center. Wood veneer and hardbo
paneling less than 1/4-inch (6 mm) nominal thickness shall not have less than a 3/8-inch (10 mm) gyp
board or gypsum panel product backer. Wood veneer paneling not less than 1/4-inch (6 mm) nominal
thickness shall conform to ANSI/HPVA HP-1. Hardboard paneling shall conform to CPA/ANSI A135.5
structural panel components within the conditioned space such as plywood, particle board, wafer boa
and oriented strand board shall be identified as "EXPOSURE 1," "EXTERIOR" or "HUD-APPROVED.
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TOWNHOUSE UNIT. A single-family dwelling unit in a townhouse that extends from foundation to roo
and that has a yard or public way on not less than two sides that extends at least 50 percent of the le
of each of these two sides.
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R602.10.10 Cripple wall bracing. Cripple walls shall be constructed in accordance with Section R60
and braced in accordance with this section. Cripple walls supporting bearing walls or exterior walls or
interior braced wall panels as required in Section R403.1.2 shall be braced with the length and metho
bracing used for the wall above in accordance with Tables R602.10.3(1) and R602.10.3(3), and the
applicable adjustment factors in Table R602.10.3(2) or R602.10.3(4), respectively, except the length
the cripple wall bracing shall be multiplied by a factor of 1.15. Where gypsum wall board is not used o
the inside of the cripple wall bracing, the length adjustments for the elimination of the gypsum wallboa
or equivalent, shall be applied as directed in Tables R602.10.3(2) and R602.10.3(4) to the length of
cripple wall bracing required. This adjustment shall be taken in addition to the 1.15 increase.
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LANDING PLATFORM. A landing provided as the top step of a stairway accessing a Loft.
LOCAL EXHAUST. An exhaust system that uses one or more fans to exhaust air from a specific roo
rooms within a residential dwelling or sleeping unit.
LOFT. A space on an intermediate level or levels between the floor and ceiling of a dwelling or sleepi
unit, open on one or more sides to the room or space in which the loft is located, and in accordance w
Section R333.
LOT LINE. The line which bounds a plot of ground described as a lot in the title to the property.
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M2105.9 CPVC plastic pipe. Joints between CPVC plastic pipe or fittings shall be solvent-cemented
accordance with Section 605 of the state plumbing code. Threaded joints between fittings and CPVC
plastic pipe shall be in accordance with Section M2105.9.1.
M2105.14 PVC plastic pipe. Joints between PVC plastic pipe or fittings shall be solvent-cemented in
accordance with Section 605 of the state plumbing code. Threaded joints between fittings and PVC
plastic pipe shall be in accordance with Section M2105.9.1.
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FLOOR AREA. The area within the inside perimeter of exterior walls of the building. The floor area of
building, or portion thereof, not provided with surrounding exterior walls shall be the usable area unde
the horizontal projection of the roof or floor above.
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AF101.1 General. This appendix contains requirements for new construction in jurisdictions where ra
resistant construction is required. Inclusion of this appendix by jurisdictions shall be required in high r
potential counties as determined in Figure AF101 and as listed in Table AF101(1). Unvented crawl
spaces are not permitted in any high radon potential county. In other areas, requirements of this appe
apply to any structure constructed with unvented crawl spaces as specified in R408.3.
TABLE AF101(1) HIGH RADON POTENTIAL (ZONE 1) COUNTIES a
WASHINGTON: Clark, Ferry, Okanogan, Pend Oreille, Skamania, Spokane, Stevens.
a. EPA recommends that this county listing be supplemented with other available state and lo
data to further understand the radon potential of Zone 1 areas.
AF103.1 General. The following construction techniques are intended to resist radon entry and prepa
the building for post-construction radon mitigation, if necessary (see Figure AF103.1). These techniqu
are required in high radon potential counties designated in Table AF101(1).
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R302.3.3 Supporting construction. Where floor/ceiling assemblies are required to be fire-resistance
rated by Section R302.3, the supporting construction of such assemblies shall have an equal or great
fire-resistance rating.
R302.3.4 Openings protection between two-family dwellings. Openings in the common fire-
resistance-rated wall assembly located between units of a two-family dwelling shall be equipped with
less than a 45-minute fire-rated door assembly equipped with a self-closing or automatic-closing devi
EXCEPTION:
A 20-minute fire-rated door assembly is permitted in buildings equipped throughout with an automatic spri
system installed in accordance with Section P2904 or NFPA 13D.
R302.3.5 Shared accessory rooms. Shared accessory rooms shall be separated from each individu
dwelling unit in accordance with Table R302.3.5. Openings between the shared accessory room and
dwelling unit shall comply with Section R302.3.5.1. Attachment of gypsum board shall comply with Ta
R702.3.5.
R302.3.5.1 Opening protection. Openings from a shared accessory room or area directly into a roo
used for sleeping purposes shall not be permitted. Other openings between the shared accessory roo
or area shall be equipped with solid wood doors not less than 1 3/8 inches in thickness, solid or
honeycomb core steel doors not less than 1 3/8 inches thick, or a fire door assembly with a 20-minute
fire-protection rating, equipped with a self-closing or automatic-closing device. |
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SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or
legal entity) which is owned and operated independently from all other businesses, which has the
purpose of making a profit, and which has fifty or fewer employees.
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ADULT FAMILY HOME. A dwelling, licensed by the state of Washington department of social and he
services, in which a person or persons provide personal care, special care, room and board to more t
one but not more than six adults who are not related by blood or marriage to the person or persons
providing the services. An existing adult family home may provide services to up to eight adults upon
approval from the department of social and health services in accordance with RCW 70.128.066.
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R324.7.1 This section is not adopted.
R325.1 General. Mezzanines shall comply with Sections R325 through R325.5. Habitable attics shall
comply with Section R326.
R326.1 General. Habitable attics shall comply with Sections R326.1 through R326.4.
EXCEPTION:
Lofts in dwelling units and sleeping units shall be permitted to comply with Section R333, subject to the
limitations in Section R333.1.
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M1701.1 Scope. Solid-fuel-burning appliances shall be provided with combustion air in accordance w
the appliance manufacturer's installation instructions. Oil-fired appliances shall be provided with
combustion air in accordance with NFPA 31. The methods of providing combustion air in this chapter
not apply to fireplaces, fireplace stoves and direct-vent appliances. The requirements for combustion
dilution air for gas-fired appliances shall be in accordance with Chapter 24. Fireplaces shall comply w
Chapter 10.
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R1004.1.1 Emission standards for factory-built fireplaces. No new or used factory-built fireplace s
be installed in Washington state unless it is certified and labeled in accordance with procedures and
criteria specified in ASTM E2558 Standard Test Method for determining particulate matter emission fr
fires in wood burning fireplaces. To certify an entire fireplace model line, the internal assembly shall b
tested to determine its particulate matter emission performance. Retesting and recertifying is required
the design and construction specifications of the fireplace model line internal assembly change. Testi
for certification shall be performed by a Washington state department of ecology (DOE) approved and
U.S. Environmental Protection Agency (EPA) accredited laboratory.
R1004.1.2 Emission standards for certified masonry and concrete fireplaces. Masonry and conc
fireplace model lines certified to Washington State Building Code Standard 31-2 prior to July 1, 2013,
may retain certification provided the design and construction specifications of the fireplace model line
internal assembly do not change.
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M1301.2 Identification. Each length of pipe and tubing and each pipe fitting utilized in a mechanical
system shall bear the identification of the manufacturer.
EXCEPTION:
The manufacturer identification for fittings and pipe nipples shall be on each piece or shall be printed on th
fitting or nipple packaging or provided documentation.
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For SI: 1 pound per square foot = 0.0479 kPa, 1 square inch = 645 mm, 1 pound = 4.45 N
a.
Elevated garage floors shall be capable of supporting the uniformly distributed live load or a 2,000-pound concentrat
load applied on an area of 4-1/2 inches by 4-1/2 inches, whichever produces the greater stresses.
b.
Uninhabitable attics without storage are those where the clear height between joists and rafters is not more than 42
inches, or where there are not two or more adjacent trusses with web configurations capable of accommodating an
assumed rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses. This live loa
need not be assumed to act concurrently with any other live load requirements.
c.
Individual stair treads shall be capable of supporting the uniformly distributed live load or a 300-pound concentrated l
applied on an area of 2 inches by 2 inches, whichever produces the greater stresses.
d.
A single concentrated load applied in any direction at any point along the top. For a guard not required to serve as a
handrail, the load need not be applied to the top element of the guard in a direction parallel to such element.
e.
See Section R507.1 for decks attached to exterior walls.
f.
Guard in-fill components (all those except the handrail), balusters and panel fillers shall be designed to withstand a
horizontally applied normal load of 50 pounds on an area equal to 1 square foot. This load need not be assumed to a
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R903.4.1 Secondary (emergency overflow) drains or scuppers. Where roof drains are required,
secondary emergency overflow drains or scuppers shall be provided where the roof perimeter
construction extends above the roof in such a manner that water will be entrapped if the primary drain
allow buildup for any reason. Overflow drains having the same size as the roof drains shall be installe
with the inlet flow line located 2 inches (51 mm) above the low point of the roof, or overflow scuppers
having three times the size of the roof drains and having a minimum opening height of 4 inches (102
shall be installed in the adjacent parapet walls with the inlet flow located 2 inches (51 mm) above the
point of the roof served. The installation and sizing of overflow drains, leaders and conductors shall
comply with Sections 1101 and 1103 of the state plumbing code. Overflow drains shall discharge to a
approved location.
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Copies of the State Building Codes and
complete copies of the 2021 International Residential Code
as published by the International Code Council
may be obtained from:
Washington Association of Building Officials
Post Office Box 7310
Olympia, Washington 98507-7310
(360) 628-8669 www.wabobookstore.org
or toll free in Washington State at (888) 664-9515
First Edition
International Residential Code
Chapter 51-51 WAC
Effective March 15, 2024
Second Edition based on
WSR 23-23-104
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R403.1.1 Minimum size. The minimum width, W, and thickness, T, for concrete footings shall be in
accordance with Tables R403.1(1) through R403.1(3) and Figure R403.1(1) or R403.1.3, as applicabl
but not less than 12 inches (305 mm) in width and 6 inches (152 mm) in depth. The footing width shal
based on the load-bearing value of the soil in accordance with Table R401.4.1. Footing projections, P
shall be not less than 2 inches (51 mm) and shall not exceed the thickness of the footing. Footing
thickness and projection for fireplaces shall be in accordance with Section R1001. The size of footing
supporting piers and columns shall be based on the tributary load and allowable soil pressure in
accordance with Table R401.4.1. Footings for wood foundations shall be in accordance with the detai
set forth in Section R403.2, and Figures R403.1(2) and R403.1(3). Footings for precast foundation sh
be in accordance with the details set forth in Section R403.4, Table R403.4, and Figures R403.4(1) a
R403.4(2).
EXCEPTION:
Light-frame construction shall be permitted to have minimum footing size in accordance with Figures 403.1
through R403.1.1(4) in lieu of that determined by Table R403.1(1).
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Appendix AWY—Construction and demolition material management.
The provisions contained in this appendix are not mandatory unless specifically referenced in
adopting ordinance.
AWY101 General.
AWY101.1 Purpose. The purpose of this code section is to increase the reuse and recycling of
construction and demolition materials.
AWY101.2 Scope. This code section applies to new buildings and structures construction, alterations
existing buildings and structures and the demolition of existing buildings and structures having a work
area greater than 750 square feet or with a project value greater than $75,000, whichever is more
restrictive.
EXCEPTION:
Projects determined to be unsafe.
AWY102 General definitions.
AWY 102.1 General. The following words and terms shall, for the purposes of this appendix, have th
meanings shown herein. Refer to Chapter 2 of this code for general definitions.
Demolition. The process of razing, relocating, or removing an existing building or structure, or a porti
thereof.
Divert, diverted, or diversion. The reuse, recycling, or beneficial use of construction
and demolition materials.
Recycling. The process of transforming or remanufacturing waste materials into useable or marketab
materials for use other than landfill disposal or incineration.
Reuse. The return of a material into the economic stream for use. |
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R301.2 Climatic and geographic design criteria. Buildings shall be constructed in accordance with
provisions of this code as limited by the provisions of this section. Additional criteria shall be establish
by the local jurisdiction and set forth in Table R301.2. The local jurisdiction shall designate the salt wa
coastal areas within their jurisdiction.
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R310.5 Replacement windows for emergency escape and rescue openings. This section is not
adopted.
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M2301.2.3 Pressure and temperature relief valves and system components. System component
containing fluids shall be protected with temperature and pressure relief valves or pressure relief valv
Relief devices shall be installed in sections of the system so that a section cannot be valved off or
isolated from a relief device. Direct systems and the potable water portion of indirect systems shall be
equipped with a relief valve in accordance with Section 504 of the state plumbing code. For indirect
systems, pressure relief valves in solar loops shall comply with SRCC 300. System components shall
have a working pressure rating of not less than the setting of the pressure relief device.
M2301.2.5 Piping insulation. Piping shall be insulated in accordance with the requirements of the st
energy code. Exterior insulation shall be protected from ultraviolet degradation. The entire solar loop
be insulated. Where split-style insulation is used, the seam shall be sealed. Fittings shall be fully
insulated.
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Building Permit Fees: The activities of the State Building Code Council are supported by permit
fees collected by each city and county. Section 19.27.085 of the State Building Code Act requires
that a fee of $6.50 be imposed on each residential permit and $25.00 on each commercial building
permit issued by each city and county. In addition, a fee of $2.00 per unit shall be imposed for each
dwelling unit after the first unit, on each building containing more than one residential unit. For the
purpose of this fee, WAC 365-110-035 defines building permits as any permit to construct, enlarge,
alter, repair, move, improve, remove, convert or demolish any building or structure regulated by the
Building Code. Exempt from the fee are plumbing, electrical, mechanical permits, permits issued to
install a mobile/manufactured home, commercial coach or factory built structure, or permits issued
pursuant to the International Fire Code.
Each city and county shall remit moneys collected to the state treasury quarterly. No remittance is
required until a minimum of $50.00 has accumulated.
These permit fees are the amounts current in January 2020. Such fees may be changed by the
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M2301.4 Heat transfer gasses or liquids and heat exchangers. Essentially toxic transfer fluids,
ethylene glycol, flammable gasses and flammable liquids shall not be used as heat transfer fluids. He
transfer gasses and liquids shall be rated to withstand the system's maximum design temperature un
operating conditions without degradation. Heat exchangers used in solar thermal systems shall compl
with Section 603.5.4 of the state plumbing code and SRCC 300. Heat transfer fluids shall be in
accordance with SRCC 300. The flash point of the heat transfer fluids utilized in solar thermal system
shall be not less than 50 degrees F above the design maximum nonoperating or no-flow temperature
attained by the fluid in the collector.
M2301.7 Solar thermal systems for heating potable water. Where a solar thermal system heats
potable water to supply a potable hot water distribution system, the solar thermal system shall be in
accordance with Sections M2301.7.1, M2301.7.2 and the state plumbing code.
M2301.7.1 Indirect systems. Heat exchangers that are components of indirect solar thermal heating
systems shall comply with the state plumbing code.
M2301.7.2 Direct systems. Where potable water is directly heated by a solar thermal system, the pi
fittings, valves and other components that are in contact with the potable water in the solar heating
system shall comply with the requirements of Chapter 6 of the state plumbing code.
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BUILDING. Any one- or two-family dwelling or townhouse, or portion thereof used or intended to be u
for human habitation, for living, sleeping, cooking or eating purposes, or any combination thereof, or a
accessory structure.
BUILDING, EXISTING. A building or structure erected prior to the adoption of this code, or one that h
passed a final inspection.
CHILD CARE, FAMILY HOME. A child care facility, licensed by Washington state, located in the dwe
of the person or persons under whose direct care and supervision the child is placed, for the care of
sixteen or fewer children, including children who reside at the home.
CHILD DAY CARE, shall, for the purposes of these regulations, mean the care of children during any
period of a 24 hour day.
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R408.8 Under-floor vapor retarder. This section is not adopted.
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R4506.1 Relocated buildings. Residential buildings or structures moved into or within the jurisdictio
not required to comply with the requirements of this code if the original use classification of the buildin
structure is not changed. Any repair, alteration, or change of use undertaken within the relocated
structure shall comply with the requirements of this code applicable to the work being performed.
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M1505.4.1 System design. The whole-house ventilation system shall consist of one or more supply f
one or more exhaust fans, or an ERV/HRV with integral fans, associated ducts and controls. Whole-
house mechanical ventilation system supply and exhaust fans shall meet the requirements of Section
M1505.4.1.2, M1505.4.1.3, M1505.4.1.4, and M1505.4.1.5. Local exhaust fans are permitted to serve
part of the whole-house ventilation system when provided with the proper controls in accordance with
Section M1505.4.2. The systems shall be designed and installed to exhaust and/or supply the minimu
outdoor airflow rates required by Section M1505.4.3 as modified by whole house ventilation system
coefficients in Section M1505.4.3.1 where applicable. The whole-house ventilation system shall opera
continuously at the minimum ventilation rate required by Section M1505.4.2 unless configured with
intermittent off controls in accordance with Section M1505.4.3.2. |
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SALT WATER COASTAL AREA. Those areas designated as salt water coastal areas by the local
jurisdiction.
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Preface
Authority: The International Residential Code (Chapter 51-51 WAC) is adopted by the Washington
Building Code Council pursuant to Chapters 19.27 and 70.92 RCW. The Washington State Building C
was first adopted by reference by the Washington State Legislature in 1974. In 1985, the Legislature
delegated the responsibility of adoption and amendment of these codes to the State Building Code
Council. The first adoption of the International Residential Code was in 2004.
Code Precedence: The State Building Code Act, Chapter 19.27 RCW, establishes the following ord
precedence among the documents adopted as parts of the State Building Code:
International Building Code, Standards and amendments – WAC 51-50;
International Residential Code, Standards and amendments – WAC 51-51;
International Mechanical Code, Standards and amendments – WAC 51-52;
International Fire Code, Standards and amendments – WAC 51-54A;
Washington Wildland-Urban Interface Code – WAC 51-55; |
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Chapter 20—Boilers and water heaters.
Informational Note: Boilers, water heaters and pressure vessels are regulated by chapter 70.79 RCW
chapter 296-104 WAC in addition to the requirements of this code.
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R602.9 Cripple walls. Foundation cripple walls shall be framed of studs not smaller than the studdin
above. When exceeding 4 feet (1219 mm) in height, such walls shall be framed of studs having the si
required for an additional story. Cripple walls supporting bearing walls or exterior walls or interior brac
wall panels as required in Sections R403.1.2 and R602.10.9.1 with a stud height less than 14 inches
mm) shall be continuously sheathed on one side with wood structural panels fastened to both the top
bottom plates in accordance with Table R602.3(1), or the cripple walls shall be constructed of solid
blocking. All cripple walls shall be supported on continuous footings or foundations.
EXCEPTION:
Footings supporting cripple walls used to support interior braced wall panels as required in Sections R403.
and R602.10.9.1 shall be continuous for the required length of the cripple wall and constructed beyond the
cripple wall for a minimum distance of 4 inches and a maximum distance of the footing thickness. The footi
extension is not required at intersections with other footings.
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R4502.2.1 Minimum design loads. The minimum design loads for the structure shall be the loads
applicable at the time the building was constructed. The minimum design loads for the structural
components shall comply with the International Residential Code. Structural elements that are uncov
during the course of the alteration and that are found to be unsafe shall be repaired in accordance wit
Section R102.7.1.
R4502.2.2 Unreinforced masonry parapet bracing. Unreinforced masonry buildings located in Seis
Design Category D0, D1, or D2 shall have parapet bracing and wall anchors installed at the roofline
whenever a reroofing permit is issued. Such parapet bracing and wall anchors shall be of an approve
design unless an evaluation demonstrates compliance of the existing bracing and anchorage.
R4502.3 Smoke alarms. Smoke alarms shall be provided in accordance with Section R314.2.2.
R4502.4 Carbon monoxide alarms. Carbon monoxide alarms shall be provided in accordance with
Section R315.2.2.
R4502.5 Replacement windows. Where an existing window, including the sash and glazed portion,
safety glazing is replaced, the replacement window or safety glazing shall comply with the requireme
of Sections 4502.5.1 through 4502.5.5 as applicable.
R4502.5.1 Energy efficiency. Replacement windows shall comply with the requirements of the
Washington State Energy Code-Residential. |
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R302.3.5.2 Duct penetration. Ducts penetrating the walls or ceilings separating the dwelling from the
shared accessory room shall be constructed of a minimum No. 26 gage (0.48 mm) sheet steel or othe
approved material and shall not have openings into the shared accessory room.
R302.3.5.3 Other penetrations. Penetrations through the walls, ceiling, and floor level separation
required in Section R302.3.5 shall be protected as required by Section R302.11, Item 4.
TABLE R302.3.5
DWELLING-SHARED ACCESSORY ROOM SEPARATION
SEPARATION
MATERIAL
From the dwelling units and attics.
Not less than 1/2-inch gypsum board or equiv
applied to the accessory room side wall.
From habitable rooms above or below the shared
accessory room.
Not less than 5/8-inch Type X gypsum board
equivalent.
Structures supporting floor/ceiling assemblies used for
separation required by this section.
Not less than 1/2-inch gypsum board or equiv
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Salvage. The recovery of construction and demolition building material and components from
a building or site in order to increase the reuse or repurpose potential of these materials and decreas
amount of material being sent to the landfill. Salvaged material may be sold, donated, or reused on si
AWY103 Construction and demolition material management.
AY103.1 Collection containers. All sites where recyclable construction and demolition materials are
generated and transported for recycling must provide a separate container for nonrecyclable material
pursuant to WAC 173-345-040.
AWY103.2 Salvage assessment. A salvage assessment shall be submitted prior to permit issuance.
The salvage assessment shall identify the building components of an existing building that, if remove
have the potential to be reused. This assessment shall be signed by the owner and serve as an affida
stating that the project shall be executed in compliance with the requirements of this code.
EXCEPTION:
Projects that include only new construction.
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M1201.4 Testing. At the discretion of the building official, flow testing may be required to verify that t
mechanical system(s) satisfies the requirements of this code. Specific testing required by other sectio
of this code shall be performed. Flow testing may be performed using flow hoods measuring at the int
or exhaust points of the system, in-line pitot tube, or pitot-traverse type measurement systems in the
short-term tracer gas measurements, or other means approved by the building official.
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M1505.4.1.1 Whole-house system component requirements. Whole-house ventilation supply and
exhaust fans specified in this section shall have a minimum efficacy as prescribed in the Washington
State Energy Code. Design and installation of the system or equipment shall be carried out in accord
with manufacturers' installation instructions. Whole-house ventilation fans shall be rated for sound at
less than the minimum airflow rate required by Section M1505.4.3.1. Ventilation fans shall be rated fo
sound at a maximum of 1.0 sone. This sound rating shall be at a minimum of 0.1 in. w.c. (25 Pa) stati
pressure in accordance with HVI procedures specified in Sections M1505.4.1.2 and M1505.4.1.3.
EXCEPTION:
HVAC air handlers, ERV/HRV units, and remote mounted fans need not meet the sound requirements. To
considered for this exception, a remote mounted fan must be mounted outside the habitable spaces,
bathrooms, toilets, and hallways, and there must be at least 4 feet ( 1.3 m) of ductwork between the fan a
the intake grille.
The whole house supply fan shall provide ducted outdoor ventilation air to each habitable space withi
the residential unit.
EXCEPTION:
Interior joining spaces provided with a 30 cfm whole house transfer fan or a permanent opening with an ar
not less than 8 percent of the floor area of the interior adjoining space but not less than 25 square feet do
require ducted outdoor ventilation air to be supplied directly to the space. Whole house transfer fans shall |
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Opinions: RCW 19.27.031 grants the council authority to render opinions relating to the building cod
the request of a local code official. For the purposes of this section, the term "code official" means the
local or state official, or their designee, responsible for implementation and enforcement of the specifi
code provision on which the opinion is requested.
At the request of a code official, the council will issue opinions relating to the codes adopted under
chapters 19.27, 19.27A, and 70.92 RCW, and council amendments to the model codes. At the reque
a local code official, the council may issue opinions on the applicability of WAC 51-04-030 to a local
government ordinance regulating construction. Council related opinions may be developed and appro
by a standing committee of the council. Opinions approved by a standing committee may be reviewed
and modified by the council.
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AT103.6 Capped roof penetration sleeve. A capped roof penetration sleeve shall be provided adjac
to a solar-ready zone when the solar-ready zone has a roof slope of 2:12 or less. The capped roof
penetration sleeve shall be sized to accommodate the future photovoltaic system conduit, but shall h
an inside diameter not less than 1 1/4 inches.
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Uniform Plumbing Code, Standards and amendments – WAC 51-56.
Where there is a conflict between codes, an earlier named code takes precedence over a later name
code. In the case of conflict between the duct insulation requirements of the International Mechanical
Code and the duct insulation requirements of the Energy Code, the Energy Code, or where applicabl
local jurisdiction's energy code, shall govern.
Where, in any specific case, different sections of this Code specify different materials, methods of
construction or other requirements, the most restrictive shall govern. Where there is conflict between
general requirement and a specific requirement, the specific requirement shall be applicable.
Organization and Numbering: These rules are written to allow compatible use with the Internationa
Mechanical Code. All sections which are amended, deleted, or added are referenced.
Enforcement: The State Building Code Act requires that each local jurisdiction enforce the State
Building Code within its jurisdiction. Any jurisdiction can contract with another jurisdiction or an inspec
agency to provide the mandated enforcement activities.
Amendments to the State Building Code:
The State Building Code Council has adopted review procedures and approval criteria for local
amendments. These procedures and criteria are found in Chapter 51-04 WAC. The Council has
exempted from its review any amendments to the administrative provisions of the various codes.
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rently with any other live load requirement.
g.
Uninhabitable attics with limited storage are those where the clear height between joists and rafters is 42 inches or
greater, or where there are two or more adjacent trusses with web configurations capable of accommodating an ass
rectangle 42 inches in height by 24 inches in width, or greater, within the plane of the trusses. The live load need onl
applied to those portions of the joists or truss bottom chords where all of the following conditions are met:
g1.
The attic area is accessed from an opening not less than 20 inches in width by 30 inches in length that is
located where the clear height in the attic is not less than 30 inches.
g2.
The slopes of the joists or truss bottom chords are not greater than 2 units vertical to 12 units horizontal.
g3.
Required insulation depth is less than the joist or truss bottom chord member depth. The remaining portion
the joists or truss bottom chords shall be designed for a uniformly distributed concurrent live load of not les
than 10 pounds per square foot.
h.
Glazing used in handrail assemblies and guards shall be designed with a load adjustment factor of 4. The load
adjustment factor shall be applied to each of the concentrated loads applied to the top of the rail, and to the load on t
fill components. These loads shall be determined independent of one another, and loads are assumed not to occur
any other live load.
i.
Where the top of a guard system is not require |
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TABLE R302.1(2)
EXTERIOR WALLS - DWELLINGS WITH FIRE SPRINKLERS
No Change to the Table
a. For residential subdivisions where all dwellings are equipped throughout with an automatic sprinkle
system installed in accordance with Section P2904, the fire separation distance for exterior walls not f
resistance-rated and for fire-resistance-rated projections shall be permitted to be reduced to 0 feet, a
unlimited unprotected openings and penetrations shall be permitted, where the adjoining lot provides
open setback yard that is 6 feet or more in width on the opposite side of the property line.
b. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the eave
overhang if fireblocking is provided from the wall top plate to the underside of the roof sheathing.
c. The fire-resistance rating shall be permitted to be reduced to 0 hours on the underside of the rake
overhang where ventilation openings are not installed in the rake overhang or in walls that are comm
attic areas.
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d to serve as a handrail, the single concentrated load shall be applied
any point along the top, in the vertical downward direction and in the horizontal direction away from the walking surfa
Where the top of a guard is also serving as the handrail, a single concentrated load shall be applied in any direction
point along the top. Concentrated loads shall not be applied concurrently.
j.
Where structural tables in Section R507 only specify snow loads, the values corresponding to 70 psf snow loads sha
used. |
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statewide amendments to the State Building Code are available from the State
Building Code Council staff.
A. Amendments of Statewide Application: On a yearly basis the State Building Code Council will
consider proposals to amend the State Building Code. The Council is not scheduled to enter form
rulemaking until 2021 as part of its consideration of adoption of the 2021 series of codes. |
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R4502.5.2 Safety glazing. Replacement glazing in hazardous locations shall comply with the safety
glazing requirements of Section R308.
R4502.5.3 Window fall protection. Window fall protection shall be installed in accordance with Sect
R312.2.
EXCEPTION:
Where only the window glazing is being replaced.
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the sone rating of Section M1505.4.1.1 and shall have whole house ventilation controls that comply with S
M1505.4.2. |
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M1505.4.1.2 Exhaust fans. Exhaust fans required shall be ducted directly to the outside. Exhaust air
outlets shall be designed to limit the pressure difference to the outside and equipped with backdraft
dampers or motorized dampers in accordance with the Washington State Energy Code. Exhaust fans
shall be tested and rated in accordance with the airflow and sound rating procedures of the Home
Ventilating Institute (HVI 915, HVI Loudness Testing and Rating Procedure, HVI 916, HVI Airflow Tes
Procedure, and HVI 920, HVI Product Performance Certification Procedure, as applicable). Exhaust f
required in this section may be used to provide local ventilation. Bathroom exhaust fans that are desi
for intermittent exhaust airflow rates higher than the continuous exhaust airflow rates in Table
M1505.4.3.2 shall be provided with occupancy sensors or humidity sensors to automatically override
fan to the high speed airflow rate. The exhaust fans shall be tested and the testing results shall be
submitted and posted in accordance with Section M1505.4.1.6. |
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Proposals to amend the State Building Code shall be made on forms provided by the Building Co
Council.
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M1505.4.1.3 Supply fans. Supply fans used in meeting the requirements of this section shall supply
outdoor air from intake openings in accordance with the International Mechanical Code Sections 401
and 401.5. When designed for intermittent off operation, supply systems shall be equipped with motor
dampers in accordance with the Washington State Energy Code. Supply fans shall be tested and rate
accordance with the airflow and sound rating procedures of the Home Ventilating Institute (HVI 915,
Loudness Testing and Rating Procedure, HVI 916, HVI Airflow Test Procedure, and HVI 920, HVI Pro
Performance Certification Procedure, as applicable). Where outdoor air is provided by supply fan syst
the outdoor air shall be filtered. The filter shall be accessible for regular maintenance and replacemen
The filter shall have a Minimum Efficiency Rating Value (MERV) of at least 8.
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