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 2018 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 of this code, Clearing and Grading. (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 2018 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 of this code, 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 2017 NFPA 58 (Liquefied Petroleum Gas Code) and 2018 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 Homes; and Appendix U, Dwelling Unit Fire Sprinkler Systems, are adopted.
B. Table R301.2(1), Climatic and Geographic Design Criteria, is amended to read as follows:
|
Roof Snow Loada (psf) |
Wind Design |
Seismic Design Category |
Flood Hazarde |
|||
|---|---|---|---|---|---|---|
|
Speedb (mph) |
Topographic Effectsc |
Special wind region |
Wind-borne debris zone |
|||
|
25 |
110 |
Yes |
No |
No |
D2 |
N.A. |
|
Subject To Damage From |
Outdoor Design Temp (F) - Heat/Cool |
Ice Barrier Underlayment Required |
Air Freezing Index |
Mean Annual Temp |
||
|---|---|---|---|---|---|---|
|
Weatheringd |
Frost Line Depth |
Termite |
||||
|
Moderate |
12 inches |
Slight to Moderate |
82/24 |
No |
113 |
49 |
|
Manual J Design Criteria |
|||||||
|---|---|---|---|---|---|---|---|
|
Elevation |
Latitude |
Winter Heating
|
Summer Cooling
|
Altitude Correction Factor |
Indoor Design Temperature |
Design Temperature Cooling |
Heating Temperature Difference |
|
203 feet |
47.79 N |
72°F max |
75°F min |
0.99 |
72°F |
75°F |
48°F |
|
Cooling Temperature Difference |
Wind Velocity Heating |
Wind Velocity Cooling |
Coincident Wet Bulb |
Daily Range |
Winter Humidity |
Summer Humidity |
|
8°F |
N.A. |
N.A. |
64 |
Medium |
75% |
68% |
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 five psf must be considered for roof slopes less than five degrees.
b. The one hundred ten miles per hour ultimate design wind speed (three-second gust) as adopted by the 2018 IRC/ASCE 7-10 (or, if using the IBC for structural design, the ninety-eight miles per hour basic design wind speed as adopted by the 2018 IBC/ASCE 7-16) may be used.
c. Wind exposure category and topographic effects (wind speed-up Kzt factor) shall be determined on a site-specific basis by the Engineer of Record (components and cladding need not consider topographic effects unless otherwise determined by the Engineer of Record).
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 C 34, C 55, C 62, C 73, C 90, C 129, C 145, C 216 or C 652.
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 of this code, Clearing and Grading. (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)