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Polyethylene and Drywall

Polyurethane | Posted in General Questions on

Can you put 4 mil poly on drywall inside the house and put another layer of drywall over the poly

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Replies

  1. Patrick_OSullivan | | #1

    Why would you want to?

    1. Polyurethane | | #3

      They are 6 in exterior walls with 3/8 rock on them and each stud they shot foam both side's so it's a bitch to Demo on the outside of the wall just built right no Tyvek

  2. Expert Member
    MALCOLM TAYLOR | | #2

    Polyurethane,

    What Patrick is suggesting is that you can get the attributes you want from poly - that is an effective air-barrier and vapour retarder - by sealing the existing drywall, and if necessary coating it to reduce its permeance.

      1. DCContrarian | | #5

        Very insightful. From the linked article:

        "Q: How can I use X to do Y?
        A: If what you want is to do Y, you should ask that question without pre-supposing the use of a method that may not be appropriate. "

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