Perms: Difference between revisions
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(Created page with "Units of permeability. Class 1 vapor barrier - 0.1 perms or less Class 2 - 1 perm Class 3 - 10 perms Built-in barrier in underlayment - can be used instead of dedicated va...") |
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Revision as of 14:16, 23 December 2023
Units of permeability.
Class 1 vapor barrier - 0.1 perms or less
Class 2 - 1 perm
Class 3 - 10 perms
Built-in barrier in underlayment - can be used instead of dedicated vapor barrier - [1]