Chapter 44 — REFERENCED STANDARDS
Section BE104 — TESTING
2025 California Residential Code (Title 24, Part 2.5) · 2025 edition · ingested 2026-07-07 · California
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BE104.1 TESTING. ¶
BE104.1 TESTING. Where radon-resistant construction is required, radon testing shall be as specified in Items 1 through 11: 1. Testing shall be performed after the dwelling passes its air tightness test. 2. Testing shall be performed after the radon control system and HVAC installations are complete. The HVAC system shall be operating during the test. Where the radon system has an installed fan, the dwelling shall be tested with the radon fan operating. 3. Testing shall be performed at the lowest occupied floor level, whether or not that space is finished. Spaces that are physically separated…