Crawl Space Radon Mitigation in Blue Ash, OH

Crawl Space Radon Mitigation in Blue Ash 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.

Blue Ash's 1950s-1970s ranch stock sits mostly on full basements with block walls and slab floors poured directly on grade without a membrane. Many of these basements were finished in a later renovation, which both raises the exposure level and complicates access to the perimeter for a suction point. Blue Ash 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 Blue Ash, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.