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  • How to Select Your Insulation Facing
    on where their perm rating falls. Any material with a perm rating that is less than 0.1 is considered a Class I Impermeable Vapor Retarder (vapor barrier). As the perm rating moves higher, the facing becomes more permeable, falling into a Class II Semi-Permeable Vapor Retarder (ranging from 0.1 - 1