July 2026•By NC Crawlspace Pros Editorial Team
Vapor Barrier vs. Full Crawl Space Encapsulation
While a basic vapor barrier reduces ground moisture evaporation, full encapsulation seals foundation vents, walls, and ground floors to create a conditioned foundation space.
Standard Polyethylene Ground Sheets
Unsealed 6-mil plastic sheets lie loose on dirt floors. They slow evaporation but allow humid outdoor air to enter through foundation vents.
Sealed Encapsulation Systems
Encapsulation uses heavy-duty 12-mil to 20-mil multi-ply liners sealed at all seams and stem walls, combined with vent closure and dehumidification.
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