Crawl Space Radon Mitigation in Westerville
Crawl spaces are mitigated with sub-membrane depressurization: a sealed plastic membrane laid over the soil and a fan drawing from beneath it. Ohio's standards set the membrane at 6 mil polyethylene or heavier where the crawl is used for storage, with 12-inch sealed overlaps and mechanical fastening to walls and piers. Split-levels and ranch additions often pair it with sub-slab suction under the basement or slab. Westerville sits within our service area for Greater Columbus and Central Ohio, with same-week scheduling typical for routine jobs.
Typical pricing in Westerville
$1,800-$3,500
Pricing varies by job specifics. Free phone or on-site quotes; fixed pricing once the technician has assessed the job.
Crawl Space Radon Mitigation in Westerville: historic Uptown core surrounded by 1960s-2000s subdivision growth foundations and Columbus-area geology
Crawl Space Radon Mitigation in Westerville 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.
Westerville's historic Uptown core near Otterbein University holds early-1900s housing on shallow stone or block basements, where soil gas moves through the wall as much as through the slab. The 1960s-2000s subdivisions that ring Uptown are on poured basements with sumps, a cleaner sub-slab suction candidate, and many of the newest ones carry a passive stack ready for fan activation. Because Westerville straddles the Franklin and Delaware County line, both foundation eras sit on the same glacial till that keeps the whole city inside EPA Zone 1. Westerville's northeast edge borders Hoover Reservoir on Big Walnut Creek, and the rest of the city sits on the flat glacial till plain typical of central Ohio. Westerville sits on geology that drives elevated regional radon exposure across the Columbus metro, including Franklin / Delaware County.
Franklin County crawl-space work is uncommon inside Columbus and its poured-basement suburbs like Dublin and Hilliard, where full basements or slabs dominate, so this scope concentrates on the small share of older outlying parcels near the county line where crawl-space construction survives from before the county's subdivision-era building boom.
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 Westerville, and Ohio licensure under ORC 3723.02 applies to any contractor performing mitigation work in the state.
- County
- Franklin / Delaware, OH
- Geology
- Regional radon-bearing soils
- EPA action level
- 4.0 pCi/L on long-term average
- Service category
- Mitigation