Chapter 17.02
INTERNATIONAL RESIDENTIAL CODE

Sections:

17.02.010    Adoption.

17.02.020    Amendments and additions.

17.02.010 Adoption.

The 2015 Edition of the International Residential Code (IRC), as adopted and amended by the State Building Code Council in Chapter 51-51 WAC, as published by the International Code Council, is adopted by reference with the following additions, deletions and exceptions: Provided, that Chapter 1, Administration, is not adopted and the Construction Administrative Code, as set forth in Chapter 17.14 MICC, shall be used in place of IRC Chapter 1, Administration. Provided, that Chapters 11 and 25 through 43 of the International Residential Code are not adopted. Provided, that the energy code is regulated by Chapter 51-11R WAC; the plumbing code is regulated by Chapter 51-56 WAC; the electrical code is regulated as adopted by MICC 17.13.020. Provided, that the standards for liquefied petroleum gas installations shall be 2011 NFPA 58 (Liquefied Petroleum Gas Code) and 2014 NFPA 54 (National Fuel Gas Code). Provided, that all other fuel gas installations shall be regulated by the International Mechanical Code and International Fuel Gas Code. Provided, that Appendix F – Radon Control Methods, Appendix Q – Dwelling Unit Fire Sprinkler Systems, and Appendix V – Fire Sprinklers are adopted. The codes, appendices, and standards set forth in this chapter shall be filed with the city clerk and a copy made available for use and examination by the public, pursuant to RCW 35A.12.140.

A. The 2015 International Swimming Pool and Spa Code (ISPSC) is included in the adoption of the International Residential Code as provided by IRC Section R329 and amended in WAC 51-51-0329, excluding Chapter 1, Part 2 – Administration. The Construction Administrative Code, as set forth in Chapter 17.14 MICC, shall be used in place of ISPSC Chapter 1, Part 2 – Administration. The design and construction of swimming pools, spas and other aquatic recreation facilities shall comply with the ISPSC, where the facility is one of the following, except that public swimming pool barriers are regulated by WAC 246-260-031(4):

1. For the sole use of residents and invited guests at a single-family dwelling;

2. For the sole use of residents and invited guests of a duplex owned by the residents; or

3. Operated exclusively for physical therapy or rehabilitation and under the supervision of a licensed medical practitioner.

All other “water recreation facilities” as defined in RCW 70.90.110 are regulated under Chapters 246-260 and 246-262 WAC. (Ord. 17C-01 § 2; Ord. 16C-04 § 2; Ord. 13C-06 § 2; Ord. 10C-03 § 2; Ord. 07C-04 § 3; Ord. 04C-12 § 4).

17.02.020 Amendments and additions.

A. IRC Table R301.2(1) Amended. International Residential Code Table R301.2(1) is hereby amended to read as follows:

IRC Table R301.2(1)

Climatic and Geographic Design Criteria

Roof Snow Loada

Wind Designb

Seismic Design Categoryc

Subject to Damage From:

Outside Design Temp – Heat/Cool

Ice Barrier Under-layment Required

Flood Hazardse

Air Freezing Index

Mean Annual Temp

Speed

Topographic Effects

Weatheringd

Frost Line Depth

Termite Decay

25 psf

110 mph

See footnoteb

D2

Moderate

12"

Slight to Moderate

24ºF/83ºF

No

N/A

113

53ºF

a    When using this roof 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    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).

c    From IRC Table 301.2(1).

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 City of Mercer Island 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.

B. IRC AV107.2 Added. International Residential Code Appendix V Section AV107.2 is hereby added as follows:

AV107.2 Fire sprinklers in Existing Buildings. An approved automatic fire sprinkler system shall be installed throughout the residence in existing one-family and two-family dwellings (and townhouses) in accordance with Appendix Q when undergoing a remodel or addition when the construction value of all additions, alterations or repairs performed within a sixty-month period exceeds 50% of the value of the residence. Value shall be determined by a method approved by the fire code official.

C. IRC AV107.3 Added. International Residential Code Appendix V Section AV107.3 is hereby added as follows:

AV107.3 Household Fire Alarm System. An approved Household Fire Alarm System shall be installed throughout the residence in existing one-family and two-family dwellings (and townhouses) that have deficiencies in Fire Flow, hydrants or access. This system shall be installed in accordance with NFPA 72 chapter 29 when undergoing a remodel or addition when the construction value of all additions, alterations or repairs performed within a sixty-month period is within 10% to 50% of the value of the residence. Value shall be determined by a method approved by the fire code official.

(Ord. 17C-01 § 2; Ord. 16C-04 § 2; Ord. 13C-06 § 2; Ord. 10C-03 § 2).