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Committee issues two formal interpretations on code scope and whole‑house ventilation
Summary
The committee approved two formal opinions: (1) the IRC/IMC cross‑reference applies as applicable under R403.6; and (2) for 2018 IMC/IRC ventilation language, fresh air must be ducted to each habitable space and group R‑2 multifamily expects balanced systems while other occupancies may use supply/exhaust/ERV combinations.
On March 14, 2025, the Mechanical Ventilation, Plumbing and Energy Code Committee approved two formal interpretations clarifying how existing code language should be applied by local jurisdictions and permit reviewers.
First, the committee adopted Opinion 25‑MARCH‑01 responding to a Bremerton/Ruston question about the 2018 and 2021 Washington State Energy Code reference in R403.6. Staff recommended, and the committee accepted, that the cited language intends the applicable provisions of the International Residential Code (IRC) to apply when a project falls within the scope of the IRC and the International Mechanical Code (IMC) to apply when it does not. Committee members recorded the…
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