Crawl Space Radon Mitigation in Delaware, OH

Crawl Space Radon Mitigation in Delaware 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.

Delaware's pre-1950 downtown near Ohio Wesleyan sits on older limestone and block basements with masonry walls that admit soil gas through the wall itself as much as through a slab crack. The newer subdivisions ringing downtown are on poured basements with sumps, a more straightforward sub-slab suction candidate. Glacial till across Delaware County keeps both halves of the city inside EPA Zone 1, so the split is about mitigation routing, not about whether elevated readings occur. Delaware sits directly on the Olentangy River, with Delaware Dam and Delaware Lake just north of downtown holding back the river's upper watershed. Delaware sits on geology that drives elevated regional radon exposure across the Columbus metro, including Delaware County.

Delaware County crawl-space work is rare along the US 23 growth corridor through Powell and Lewis Center, where poured basements are standard, and concentrates instead on the older rural parcels around Galena, Sunbury, and Ostrander, where farmhouse construction on the glacial till plain more often used a crawl space than a dug basement.

ANSI/AARST SGM-SF-2023, the standard for existing homes, calls for a sealed membrane and a system monitor, typically a manometer, showing continuous negative pressure beneath it. The Ohio Department of Health Radon Licensing Program oversees radon program compliance for Delaware, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.