How does crawl space radon mitigation differ from basement mitigation?

Crawl space mitigation uses a sub-membrane depressurization approach instead of sub-slab. A heavy-duty vapor barrier is installed across the dirt floor and sealed to the walls, then a fan creates suction beneath the barrier. This is necessary because crawl spaces typically lack a concrete slab to drill through.

Will crawl space radon mitigation help with moisture too?

Yes! The vapor barrier installed as part of crawl space radon mitigation also serves as an excellent moisture barrier. Many homeowners notice reduced humidity, less musty odors, and fewer moisture-related issues after crawl space radon mitigation is installed.

Can I combine radon mitigation with crawl space encapsulation?

Absolutely. In fact, combining radon mitigation with full crawl space encapsulation is one of the most effective approaches for homes with crawl spaces. The encapsulation addresses moisture and air quality, while the radon system specifically targets radon gas.

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Crawl Space Radon Mitigation

Specialized radon mitigation for homes with crawl spaces using sub-membrane depressurization and vapor barriers.

Typical Cost$1,200 – $3,000

Timeframe4-8 hours installation

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About Crawl Space Solutions

Homes with dirt-floor crawl spaces require a specialized approach to radon mitigation called Sub-Membrane Depressurization (SMD). This technique involves installing a heavy-duty vapor barrier across the crawl space floor and walls, then creating suction beneath the barrier to draw radon gas out before it enters your home. The system is highly effective and also helps control moisture and improve overall crawl space health.

Home protected with crawl space radon mitigation

Key Benefits

Specifically designed for crawl space construction

Vapor barrier also reduces moisture, mold, and pest issues

Effective radon reduction comparable to sub-slab methods

Improves overall crawl space air quality and home comfort

Can be combined with crawl space encapsulation for maximum benefit

Reduces energy costs by minimizing conditioned air loss

How It Works

Crawl space inspection to assess size, condition, and access points

Heavy-duty polyethylene vapor barrier (6-20 mil) installed across floor

Barrier sealed to foundation walls and around piers/supports

Suction point(s) placed beneath the barrier with PVC piping

Piping routed to exterior with inline radon fan

System creates continuous negative pressure beneath the barrier

Post-installation radon test confirms effective reduction

Ideal For

Homes with dirt-floor crawl spaces
Properties with combined crawl space and basement areas
Homes experiencing both radon and moisture issues
Older homes built over unfinished crawl spaces

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