Crawl Space Radon Mitigation in Madeira, OH

Crawl Space Radon Mitigation in Madeira involves sub-membrane depressurization: a 20-mil polyethylene liner sealed to the crawl walls with an inline fan drawing soil gas from beneath, working on the crawl-space envelope where ground-source soil gas enters through bare earth. The service is the right scope for any crawl-space-foundation home testing above 4.0 pCi/L, in place of sub-slab depressurization which does not apply to crawl spaces.

Madeira's 1950s-1970s ranch and split-level stock mixes partial basements with crawl spaces, and split-levels frequently put a slab-on-grade wing directly against living space. A crawl space in this stock usually needs a sealed membrane and sub-membrane depressurization rather than a slab suction point. Madeira sits on the Cincinnati Arch geology (fractured Ordovician limestone and shale) that drives elevated regional radon exposure across the entire Greater Cincinnati metro, including Hamilton County.

ANSI/AARST CCAH-2020-0523 requires membrane sealing and a manometer verifying continuous negative pressure across the membrane. The Ohio Department of Health Radon Licensing Program oversees radon program compliance for Madeira, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.