The main goal of vapor barrier installation is to control moisture diffusion. When ground moisture enters the structure through the floor slabs, it can cause the wood to rot and trigger the growth of mildew and mold. Moisture can also build up in the walls and the attic, causing poor air quality. A vapor barrier is a type of vapor retarder, and this crawl space plastic is the permeability level that makes it considered a vapor barrier.
The 3 Classes of Permeability for Vapor Barriers
Vapor barriers are classified under Class I and Class II.
- A Class I Vapor retarder has a perm of 0.1 or less, meaning it’s impermeable. This is usually a non-perforated aluminum foil sandwiched between 2 sheets of 6 mil polyethylene. It blocks the moisture entirely.
- A Class II Vapor retarder has a perm of 0.1 to 1.0 perms. This is what the crawl space and radiant barriers fall under and it’s considered semi-impermeable.
- A Class III Vapor Retarder has a perm of 1.0 to 10 perms. Class III vapor retarders are generally latex or enamel paints and they are permeable.
Choosing the Right Vapor Barrier for Crawl Space
Choosing the right insulation vapor barrier is important when it comes to the matters of your home or building. That’s why our crawl space vapor barrier specialists are thoroughly educated on the liners we sell to advise the best product for your application. The specs are available on our site so you can see for yourself how the product measures up.
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Vapor Barriers for Growers, Builders & Distributors
Americover is the smart source for vapor barrier plastic, polyethylene and plastic sheeting solutions. Our friendly, knowledgeable staff is here to answer your questions and fulfill orders Monday-Friday from 6 a.m. to 6:30 p.m. Pacific Standard Time. If you would like to speak with one of our experts, call us at 760-388-6294 or email email@example.com.