Crawl Space Radon Mitigation in Cincinnati, OH

Crawl Space Radon Mitigation in Cincinnati 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.

Cincinnati's owner-occupied core is dominated by 1920s-1960s houses over full basements, many with original block or early-poured walls, floor-drain penetrations, and no vapor barrier under the slab. Older Over-the-Rhine and West End brick stock frequently sits on stone rubble foundations where soil gas enters through the wall itself rather than a single slab crack. The Cincinnati Arch geology under the city is fractured limestone and shale, which drives the radon and basement-moisture profile that shapes most retrofit decisions. Cincinnati 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 Cincinnati, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.