Vapor barriers can be especially important, however, in crawlspaces and basements, as well as slab-on-grade foundations. Where, in a home, are they typically used? They are used throughout a home. Some other reasons you may want to utilize vapor barriers throughout your home, whether it be for new construction or remodeling, are: Vapor barriers are used for a number of reasons, the most prominent of which is to prevent mold, but rot and other problems can occur within the walls, as well. When most homes are insulated, building codes require vapor barriers. Vapor barriers are used primarily to keep moisture from building up within the insulation when your home was constructed for the purpose of keeping you warm. A material’s permeability is a measurement of the number of grains of water vapor passing through a square foot of material per hour at a known differential vapor pressure, or, in lay terms, the rate at which a liquid or gas can pass through a material. The word barrier has the inference of a solid seal that would stop any moisture flow, but these, or any materials, would let some vapor pass through.Ī vapor barrier’s potential to retard water diffusion is determined in terms of “perms”. Vapor Barriers are not actually “barriers” at all, but vapor-diffusion retardants, or VDRs, which, at the molecular level, balance the flow of moisture. They are most commonly made of vapor-retardant paint, treated paper or foil, or polyethylene plastics, but there are other options. What is a vapor barrier and what is it used for? Vapor barriers are materials that combat moisture diffusion through walls, ceilings, and floors. Importance of Knowing the Facts About Vapor Barriers The What, Why and Where of Vapor Barriers
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