Crawl spaces are one of the most common radon entry points in older Twinsburg homes, especially those with dirt floors or unsealed vapor barriers. We install sub-membrane depressurization systems and heavy-duty vapor barriers that block radon gas and reduce moisture levels at the same time.
Why Crawl Spaces Are Radon Hot Spots
A crawl space with an exposed dirt floor is essentially an open pathway for radon gas. The soil beneath your home constantly emits radon, and without a sealed barrier, that gas moves freely into your crawl space and up into your living areas through floor penetrations, ductwork, and the natural stack effect.
Older homes in Twinsburg Township, Sagamore Hills along Boyden Road, and the 1960s-70s ranch homes in Macedonia's Highland Road corridor often have crawl spaces with thin, deteriorated plastic sheeting that provides little to no radon protection. Gaps around pipes, foundation walls, and access openings make the problem worse. Northeast Ohio's freeze-thaw cycles widen foundation cracks each winter, increasing radon entry over time.
Sub-Membrane Depressurization
Sub-membrane depressurization (SMD) is the crawl space equivalent of sub-slab depressurization. We install a sealed, heavy-duty polyethylene membrane over the crawl space floor and up the foundation walls, then place a suction point beneath the membrane connected to a radon fan.
The fan creates negative pressure beneath the membrane, drawing radon from the soil and venting it outdoors before it can enter your home. This approach is highly effective and also reduces crawl space moisture, which helps prevent mold and structural issues.
Vapor Barrier Installation
We use 20-mil cross-laminated polyethylene — not the thin 6-mil plastic you find at hardware stores. Our vapor barriers are sealed at every seam with specialized tape, secured to foundation walls with mechanical fasteners and mastic, and sealed around all pipe and post penetrations.
A properly installed vapor barrier transforms a damp, radon-prone crawl space into a clean, dry, controlled environment. Combined with an active depressurization system, it is the most effective crawl space radon solution available.
Crawl Space Radon + Moisture Control
Radon and moisture problems in crawl spaces go hand in hand. The same soil gas pathways that allow radon into your home also allow water vapor, which contributes to mold, wood rot, and poor indoor air quality.
Our crawl space systems address both problems simultaneously. The sealed membrane blocks moisture and radon, and the active depressurization system keeps the space under negative pressure so neither can accumulate.
Not sure if your crawl space is the source? Start with professional radon testing to pinpoint entry points. For homes with basements instead of crawl spaces, see our sub-slab radon mitigation systems. Buying a home with a crawl space? Our real estate radon services include expedited crawl space solutions before closing. Contact us for a free crawl space assessment.