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Retrieving "Polyethylene Film" from the archives

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  1. Moisture Vapor Transmission

    Linked via "Polyethylene films"

    | Classification | Permeance Range ($M$) | Typical Material Examples | Dominant Vapor Behavior |
    | :--- | :--- | :--- | :--- |
    | 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-abso…