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Vapor permeance

from Pro Remodeler

Terms such as “vapor barrier” or “vapor retarder” are familiar to most of us, even though we may not be completely clear on their differences. They describe a material’s vapor permeance — its ability to prevent or allow water vapor to pass through it. Materials with high vapor permeance allow a lot of water vapor to pass through; materials with low vapor permeance block some or all water vapor from passing through them and are called “vapor retarders” or “vapor barriers.” more

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