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Digest

Understanding Vapor Barriers

By Joseph Lstiburek

Building Science Digest 106: last updated 2009/08/10

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The function of a vapor barrier is to retard the migration of water vapor. Where it is located in an assembly and its permeability is a function of climate, the characteristics of the materials that comprise the assembly and the interior conditions. Vapor barriers are not typically intended to retard the migration of air. That is the function of air barriers.

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RR-0410: Vapor Barriers and Wall Design   RR-0410: Vapor Barriers and Wall Design
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