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BackPage Primer from Environmental Building News
September 1, 2008
Vapor Retarders and Air Barriers:
Managing Moisture in Building Envelopes
When one side of a wall, roof, or foundation assembly is colder than the other, moisture in the air can condense on a cold surface inside the assembly, potentially causing mold problems and structural decay. Moisture from air can get into a wall cavity through air leaks or, in smaller quantities, by diffusing through a permeable material such as drywall. Many people think in terms of vapor barriers addressing both of these problems, but there are two distinct functions: preventing air leakage, accomplished with an air barrier; and controlling moisture diffusion, which calls for a vapor retarder.
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