Chapter 12.06
BUILDING CODES
Sections:
12.06.020 International Building Code.
12.06.025 International Residential Code.
12.06.010 Building Code.
The International Building Code (IBC) and the International Residential Code (IRC), as adopted and amended by this chapter, shall collectively be called the building code. (Ord. 21-626 § 1 (Exh. A), 2021; Ord. 17-578 § 1 (Exh. E (part)), 2017: Ord. 07-478 § 1 (part), 2007: Ord. 04-447 § 1 (part), 2004)
12.06.020 International Building Code.
The 2021 Edition of the International Building Code, as published by the International Code Council, as adopted and amended by the Washington State Building Code Council in Chapter 51-50 WAC, is adopted by reference with the following additions, deletions, and exceptions:
A. Chapter 1, Scope and Administration, is not adopted and the Construction Administrative Code, as set forth in Chapter 12.05 of this code, shall be used in place of IBC Chapter 1, Scope and Administration.
B. ICC/ANSI A117.1-2009, Requirements for Accessible and Useable Buildings and Facilities, is adopted by reference.
C. Grading shall comply with Chapter 16.08, Clearing and Grading. (Ord. 24-655 § 5, 2024; Ord. 21-626 § 1 (Exh. A), 2021; Ord. 17-578 § 1 (Exh. E (part)), 2017: Ord. 16-573 § 1, 2016: Ord. 13-548 § 5, 2013: Ord. 10-523 § 3, 2010: Ord. 07-478 § 1 (part), 2007: Ord. 04-447 § 1 (part), 2004)
12.06.025 International Residential Code.
A. The 2021 Edition of the International Residential Code (IRC), as published by the International Code Council, as adopted and amended by the State Building Code Council and as published in Chapter 51-51 WAC, is adopted by reference with the following additions, deletions, and exceptions:
1. Chapter 1, Part 2, Administration and Enforcement, is not adopted and the Construction Administrative Code, as set forth in Chapter 12.05, shall be used in place of IRC Chapter 1, Part 2, Administration and Enforcement.
2. Chapters 11 and 25 through 43 of the International Residential Code are not adopted.
3. The energy code is regulated by Chapter 51-11R WAC.
4. The plumbing code is regulated by Chapter 51-56 WAC.
5. The standards for liquefied petroleum gas installations shall be 2020 NFPA 58 (Liquefied Petroleum Gas Code) and 2021 NFPA 54 (National Fuel Gas Code).
6. All other fuel gas installations shall be regulated by the International Mechanical Code and International Fuel Gas Code.
7. Appendix F, Radon Control Methods; Appendix Q, Tiny Houses; and Appendix U, Dwelling Unit Fire Sprinkler Systems, are adopted.
8. Exceptions.
a. 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 fruits. "Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.
b. 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 of 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 their employees or by another person, including a temporary worker housing operator, who is providing such accommodations for employees, for temporary, seasonal occupancy, and includes "labor camps" under RCW 70.54.110.
B. Table R301.2, Climatic and Geographic Design Criteria, is amended to read as follows:
|
GROUND SNOW LOADa (psf) |
WIND DESIGN |
SEISMIC DESIGN CATEGORY |
|||
|---|---|---|---|---|---|
|
Speedb (mph) |
Topographic effectsc |
Special wind region |
Windborne debris zone |
||
|
25 |
110 |
Yes |
No |
No |
D2 |
|
SUBJECT TO DAMAGE FROM |
ICE BARRIER UNDERLAYMENT REQUIRED |
FLOOD HAZARDe |
AIR FREEZING INDEX |
MEAN ANNUAL TEMP |
||
|---|---|---|---|---|---|---|
|
Weatheringd |
Frost Line Depth |
Termite |
||||
|
Moderate |
12 inches |
Slight to Moderate |
No |
NA |
113 |
49° F |
|
MANUAL J DESIGN CRITERIA |
|||||
|---|---|---|---|---|---|
|
Elevation |
Altitude correction factor |
Coincident wet bulb |
Indoor winter design dry-bulb temperature |
Outdoor winter design dry-bulb temperature |
Heating temperature difference |
|
203 feet |
0.99 |
64° F |
72° F |
24° F |
48° F |
|
Latitude |
Daily Range |
Indoor summer design relative humidity |
Summer design gains 50% RH |
Indoor summer design dry-bulb temperature |
Outdoor summer design dry-bulb temperature |
Cooling temperature difference |
|
47.79° |
Medium |
68% |
5 |
75° F |
83° F |
8° F |
a. This is the minimum roof snow load. When using this snow load it will be left to the engineer's judgment whether to consider drift or sliding snow. However, rain on snow surcharge of 5 psf must be considered for roof slopes less than 5 degrees.
b. The basic wind speed is determined from the basic wind speed map in Figure R301.2(2). Wind exposure category shall be determined on a site-specific basis in accordance with Section R301.2.1.4.
c. Topographic effects (Wind Speed-up Kzt factor) shall be determined on a site-specific basis in accordance with Section R301.2.1.5.
d. Weathering may require a higher strength concrete or grade of masonry than necessary to satisfy the structural requirements of this code. The grade of masonry units shall be determined from ASTM C34, C55, C62, C73, C90, C129, C145, C216 or C652.
e. The Town of Woodway participates in the National Flood Insurance Program (NFIP); Regular Program (No Special Flood Hazard Area). Further NFIP participation information: CID 530083, Initial FHBM Identified 06/28/74, Initial FIRM Identified 05/16/95, Current Effective Map Date (NSFHA), Reg-Emer Date 06/30/97, 53033C0654G effective 8/19/2020.
C. Grading shall comply with Chapter 16.08, Clearing and Grading. (Ord. 24-655 § 6, 2024; Ord. 21-626 § 1 (Exh. A), 2021; Ord. 17-578 § 1 (Exh. E (part)), 2017: Ord. 16-573 § 2, 2016: Ord. 13-548 § 6, 2013: Ord. 11-528 § 1, 2011; Ord. 10-523 § 4, 2010: Ord. 08-498 § 1, 2008; Ord. 07-478 § 1 (part), 2007: Ord. 04-447 § 1 (part), 2004)
12.06.030 Copy on file.
At least one copy of the adopted editions of the International Building Code and the International Residential Code shall be on file in the office of the Town Clerk. (Ord. 21-626 § 1 (Exh. A), 2021)