Crawl Space Radon Mitigation in Lewis Center, OH

Crawl Space Radon Mitigation in Lewis Center 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.

Lewis Center's stock is almost entirely post-1995 subdivision construction along the US 23 corridor, built to the radon-resistant new construction code with a passive vent stack run to the roof. Activating that stack with a fan is the typical fix here rather than a ground-up sub-slab system. The glacial till under Delaware County's EPA Zone 1 designation means the passive stack alone is frequently not enough on its own. Lewis Center sits along the Olentangy River corridor that has driven the US 23 growth strip north from Columbus, on the flat glacial till plain typical of Delaware County. Lewis Center 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 Lewis Center, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.