Crawl Space Encapsulation in New Jersey
Encapsulating a crawl space means covering the ground and walls with a heavy liner, sealing vents and gaps, and drying the air with a dehumidifier. It stops musty air, wet insulation and rot in the floor framing.
High water tables come first
In parts of the New Jersey Coastal Plain the water table is close to the surface. Evesham Township's environmental inventory describes Atsion soils with a seasonal high water table between 6 and 12 inches and Lakehurst soils at 18 to 42 inches. A crawl space on ground like that may need a perimeter drain and sump before any liner goes down.
Radon under the floor
Bare soil in a crawl space lets radon rise freely. A sealed liner can form part of a sub-membrane radon system, but in New Jersey that system has to be designed and installed by an NJDEP-certified mitigation business.
- Liner thickness and taped seams
- Sealed vents, access door and rim joists
- Dehumidifier capacity and drain
- Drainage or sump beneath the liner if water collects
Crawl Space Encapsulation questions
Should New Jersey crawl space vents be closed?
In an encapsulated crawl space, yes. Humid summer air entering through vents condenses on cooler surfaces underneath.
Can a waterproofing contractor make my crawl space a radon system?
Only if they hold NJDEP radon mitigation certification. Otherwise, have a certified business design the radon part.
My crawl space floods in spring. Is encapsulation still possible?
Yes, after drainage. On soils with a high seasonal water table, plan for a drain and sump under the liner.
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