Vapor Permeance

Vapor Permeance, Green-Built, North Texas, Class, Central Texas, Glossary, Definitions, Green Buiding, Green Homes, Green Builder, Energy-Efficient Houses

Vapor Permeance: Classification

Class I: Materials that have a permeance of 0.1 perm or less.

Note: this is also the definition of a “vapor barrier".

Class II: Materials that have a permeance of 1.0 perm or less and greater than 0.1 perm.

Note: This is the definition of a “vapor retarder". Class III: Materials that have a permeance of 10 perms or less and greater than 1.0 perm. Class IV: Materials that have a permeance greater than 10 perms.

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