Washington Administrative Code

M2301.2.3 Pressure and temperature relief valves and system components. System components containing fluids shall be protected with temperature and pressure relief valves or pressure relief valves. Relief devices shall be installed in sections of the system so that a section cann…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 10-03-098, § 51-51-2439, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.190, 19.27.020, and chapters 19.27 and 34.05 RCW. WSR 08-01-102, § 51-51-2439, filed 12/18/07, effective 4/1/08.]

P2904.1.1 Required sprinkler locations. Sprinklers shall be installed to protect all areas of a dwelling unit.EXCEPTIONS:1. Uninhabitable attics, crawl spaces and normally unoccupied concealed spaces that do not contain fuel-fired appliances do not require sprinklers. In uninhabi…

AHAMAssociation of Home Appliance Manufacturers1111 19th St N.W., #402Washington D.C. 20036HRH-2-2019: Household Range Hoods.M1505.4.4.2Certified Range Hood DirectoryM1505.4.4.3.1ANCENMX-J-521/2-40-ANCE—2019/CAN/CSA-22.2 No. 60335-2-40—19/UL 60335- 2-40-2019 Household and Similar…

R4501 Scope and purpose.R4501.1 General.Repairs, alterations, additions, and relocation of existing buildings and structures shall comply with the provisions of this code for new construction, except as modified by this chapter. Structural elements and systems shall comply with S…

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 permitt…

R4503.1 General.Repairs shall comply with the applicable provisions of the code for new construction or as permitted by this section. Work on undamaged components that is necessary for the required repair of damaged components shall be considered part of the repair and shall not …

R4504.1 General.Alterations to existing buildings shall comply with the provisions of this code for new construction, except as permitted by this section.R4504.2 Newly constructed elements. Newly constructed elements, components, and systems shall comply with the requirements of …

R4505.1 Additions to an existing building. Additions shall comply with this section and other applicable provisions of this code for new construction.R4505.2 Structure for horizontal additions. Where an addition involves new construction next to and attached to an existing buildi…

R4506.1 Relocated buildings. Residential buildings or structures moved into or within the jurisdiction are not required to comply with the requirements of this code if the original use classification of the building or structure is not changed. Any repair, alteration, or change o…

AF101.1 General. This appendix contains requirements for new construction in jurisdictions where radon-resistant construction is required.Inclusion of this appendix by jurisdictions shall be required in high radon potential counties as determined in Figure AF101 and as listed in …

AF103.1 General. The following construction techniques are intended to resist radon entry and prepare the building for post-construction radon mitigation, if necessary (see Figure AF103.1). These techniques are required in high radon potential counties designated in Table AF101(1…

AQ102 Definitions.EGRESS ROOF ACCESS WINDOW. See Chapter 2.LANDING PLATFORM. See Chapter 2.LOFT. See Chapter 2.TINY HOUSE. A dwelling unit that is 400 square feet (37 m2) or less in floor area excluding sleeping lofts.AQ103.1 Minimum ceiling height. Habitable space in tiny houses…

The design and installation of residential fire sprinkler systems shall be in accordance with the International Residential Code Section P2904 Dwelling Unit Fire Sprinkler Systems.P2904.1.1 Required sprinkler locations. Sprinklers shall be installed to protect all areas of a dwel…

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.AT101 Scope.AT102 General definitions.AT102.1 General. The following term shall, for the purpose of this appendix, have the meaning shown herein.Solar-ready zone. …

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.AWV107.1 Fire sprinklers. An approved automatic fire sprinkler system shall be installed in new one-family and two-family dwellings and townhouses in accordance wi…

The provisions contained in this appendix are not mandatory unless specifically referenced in the 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. T…

The provisions contained in this appendix are not mandatory unless specifically referenced in the adopting ordinance.AWZ101 General.AWZ101.1 Purpose. The purpose of this section is to increase the amount of material salvaged for reuse through the act of deconstruction when a buil…

These rules are adopted under the authority of chapter 19.27 RCW.[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-001, filed 12/17/03, effective 7/1/04.]

The purpose of these rules is to implement the provisions of chapter 19.27 RCW, which provides that the state building code council shall maintain the State Building Code in a status which is consistent with the purpose as set forth in RCW 19.27.020. In maintaining the codes the …

The 2021 edition of the International Mechanical Code published by the International Code Council is hereby adopted by reference with the exceptions noted in this chapter of the Washington Administrative Code (WAC).[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105,…

In the case of conflict between the duct sealing or insulation requirements of Section 603 or Section 604 of this code and the duct sealing or insulation requirements of chapter 51-11C WAC, the Washington State Energy Code, or where applicable, a local jurisdiction's energy code,…

[Statutory Authority: RCW 19.27.190, 19.27.074, 19.27.031 and chapters 19.27 and 34.05 RCW. WSR 10-03-099, § 51-52-005, filed 1/20/10, effective 7/1/10. Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 04-01-104, § 51-52-005, filed 12/17/03, effective 7/1/04.]

The exceptions and amendments to the International Mechanical Code contained in the provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rules.The provisions of this code do not apply to temporary growing structures used solely for t…

The International Mechanical Code adopted by chapter 51-52 WAC shall become effective in all counties and cities of this state on March 15, 2024.[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 23-23-105, § 51-52-008, filed 11/15/23, effective 3/16/24; WSR 23-02-055, 23-12-…

101.2 Scope. This code shall regulate the design, installation, maintenance, alteration and inspection of mechanical systems that are permanently installed and utilized to provide control of environmental conditions and related processes within buildings. This code shall also reg…

Reserved.[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 17-10-075, § 51-52-0102, filed 5/3/17, effective 6/3/17; WSR 16-01-148, § 51-52-0102, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, §…

113.4 Failure to comply. Any person who shall continue any work after having been served with a stop work order, except such work as that person is directed to perform to remove a violation or unsafe condition, shall be subject to fines established by the code official.[Statutory…

BALANCED WHOLE HOUSE VENTILATION. Any combination of concurrently operating residential dwelling or sleeping unit mechanical exhaust and mechanical supply whereby the total mechanical exhaust airflow rate is within 10 percent or 5 cfm, whichever is greater, of the total mechanica…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-0301, filed 1/8/20, effective 7/1/20; WSR 16-01-148, § 51-52-0301, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-03…

306.5 Equipment and appliances on roofs or elevated structures. Where equipment requiring access or appliances are located on an elevated structure or the roof of a building such that personnel will have to climb higher than 16 feet (4877 mm) above grade to access such equipment …

307.2.3 Auxiliary and secondary drain systems. In addition to the requirements of Section 307.2.1, where damage to any building components could occur as a result of overflow from the equipment primary condensate removal system, one of the following auxiliary protection methods s…

401.2 Ventilation required. Every occupied space other than enclosed parking garages and buildings used for repair of automobiles shall be ventilated in accordance with Section 401.2.1, 401.2.2 or 401.2.3. Enclosed parking garages and buildings used for repair of automobiles shal…

403.1 Ventilation system. Mechanical ventilation shall be provided by a method of supply air and return or exhaust air. The amount of supply air shall be approximately equal to the amount of return and exhaust air. The system shall not be prohibited from producing negative or pos…

404.4 Automobile repair facilities. In buildings used for the repair of automobiles, each repair stall shall be equipped with an exhaust extension duct, extending to the outside of the building. Exhaust extension duct over 10 feet in length shall mechanically exhaust at least 300…

407.1 General. Mechanical ventilation for health care facilities licensed by Washington state shall be designed and installed in accordance with this code and the following provisions of the Washington Administrative Code (WAC):1. Mechanical ventilation in ambulatory care facilit…

501.3.1 Location of exhaust outlets. The termination point of exhaust outlets and ducts discharging to the outdoors shall be located with the following minimum distances:1. For ducts conveying explosive or flammable vapors, fumes or dusts: 30 feet (9144 mm) from the property line…

504.4 Exhaust installation. Dryer exhaust ducts for clothes dryers shall terminate on the outside of the building and shall be equipped with a backdraft damper located where the duct terminates. Dryer exhaust ducts may terminate at exterior wall louvers with openings spaced not l…

505.3 Domestic exhaust ducts. Ducts serving domestic cooking exhaust equipment shall discharge to the outdoors through sheet metal ducts constructed of galvanized steel, stainless steel, aluminum or copper. Such ducts shall have smooth inner walls, shall be airtight, shall be equ…

506.3.2.4 Vibration isolation. A vibration isolation connector for connecting a duct to a fan shall consist of noncombustible packing in a metal sleeve joint of approved design or shall be a coated-fabric flexible duct connector rated for continuous duty at temperature of not les…

507.1.2 Domestic cooking appliances used for commercial purposes. Domestic cooking appliances utilized for commercial purposes shall be provided with Type I, Type II or residential hoods as required for the type of appliances and processes in accordance with Table 507.1.2 and Sec…

515.1 General. Waste or linen chutes shall be gravity vented in accordance with NFPA 82.EXCEPTION:Waste or linen chutes may be mechanically ventilated by an exhaust fan in accordance with Section 713.13.7 of the International Building Code.[Statutory Authority: RCW 19.27.031 and …

601.2 Air movement in egress elements. Corridors shall not serve as supply, return, exhaust, relief or ventilation air ducts.EXCEPTIONS:1. Use of a corridor as a source of makeup air for exhaust systems in rooms that open directly onto such corridors, including toilet rooms, bath…

602.1 General. Supply, return, exhaust, relief and ventilation air plenums shall be limited to uninhabited crawl spaces, areas above a ceiling or below the floor, attic spaces and mechanical equipment rooms. Plenums shall be limited to one fire area. Air systems that serve multip…

603.5.1 Gypsum ducts. The use of gypsum boards to form air shafts (ducts) shall be limited to return air systems where the air temperatures do not exceed 125ºF (52ºC) and the gypsum board surface temperature is maintained above the airstream dew-point temperature. Supply air duct…

605.1 General. Air handlers and ventilation systems shall be provided with approved air filters in accordance with Section 605.4. Filters shall be installed such that all return air, recirculated air, outdoor air and makeup air is filtered upstream from any heat exchanger or coil…

606.2.1 Return air systems. Smoke detectors shall be installed in return air systems with a design capacity greater than 2,000 cfm (0.9 m3/s), in the return air duct or plenum upstream of any filters, exhaust air connections, outdoor air connections, or decontamination equipment …

607.5.2 Fire barriers. Ducts and air transfer openings that penetrate fire barriers shall be protected with listed fire dampers installed in accordance with their listing. Ducts and air transfer openings shall not penetrate enclosures for interior exit stairways and ramps and exi…

915.3 Installation of emergency and legally required power systems. Emergency power systems and legally required standby power systems required by the International Building Code or International Fire Code shall be installed in accordance with the International Fire Code, NFPA 70…

[Statutory Authority: RCW 19.27.031 and 19.27.074. WSR 20-03-041, § 51-52-0928, filed 1/8/20, effective 7/1/20; WSR 16-01-148, § 51-52-0928, filed 12/21/15, effective 7/1/16. Statutory Authority: RCW 19.27.031, 19.27.074 and chapters 19.27 and 34.05 RCW. WSR 13-04-053, § 51-52-09…