Are Crawl Space Vapor Barriers Necessary. If you have more than just dampness in your crawl space, a vapor barrier is not sufficient. The purpose of the vapor retarder is to ensure that the ground moisture stays out of your home. A vapor barrier is a thick plastic sheet that is laid throughout the crawlspace of the home.
Crawl Space Vapor Barriers | ISI Building Products
Primarily, plastic is installed in crawl spaces to residential buildings to create a barrier against moisture or vapor. Plastic sheeting in your crawl space can serve a number of useful purposes. This is because unsealed crawl spaces lead to unwanted.
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Where barriers overlap, the seams must overlap by 6 inches and be sealed. Without a vapor barrier, moisture will migrate to the surface of the soil and eventually cause. You need a vapor barrier in your crawl space. Joints must overlap no less than 6 inches, and all seams must be taped (source.
