Crawl Space Moisture Control - Vapor Barriers
Traditionally, crawl spaces have a 6-mil vapor barrier in them. This liner is similar to the thickness of a trash bag. It is staked down creating holes in the barrier, adding weak points for the material to rip as service persons move through the crawl space. Seams cannot be sealed to each other or to the walls or piers, allowing water vapor to rise into the crawl space and raise the relative humidity.