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Vapor Barrier

A vapor barrier or weather barrier refers to any material, typically a plastic or foil sheet, that slows the rate of moisture penetrating through a wall, ceiling or floor of a house. Obviously moisture occurs outside in the form of precipitation, but moisture also occurs naturally inside all homes in the form of vapor: occupants expel moisture when breathing and perspiring. Bathing and cooking also produce water vapor. Its important to keep water from the outside from getting inside but it is also important for water vapor inside to get outside. A good vapor barrier installation allows for both to happen.

Most weather barrier products today come in long continuous rolls so the entire house can, depending on the size, be wrapped in one application. Careful attention to all openings such as doors, windows, pipes and ducts is required.

 


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