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Retrieving "Vapor Permeable" from the archives

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  1. Moisture Vapor Transmission

    Linked via "Vapor Permeable"

    | Vapor Retarder (Class II) | $0.1 \text{ to } 10 \text{ Perms}$ | Polyethylene films ($\ge 6\text{ mil}$), fiberboard | Slows diffusion; allows necessary seasonal drying. |
    | Vapor Barrier (Class I) | $M < 0.1 \text{ Perms}$ | Foil-faced rigid foam, butyl rubber sheeting | Near-absolute obstruction; requires precise placement relative to the dew point plane. |
    | **[Vapor Permeab…