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Community and Q&A

Vapor barrier in showers with exterior foam

Stan Smith | Posted in General Questions on

IF anybody has any advice on what to do with a vapor barrier behind hardi backer for shower tile walls that would be helpful. I’ve got a few inches of exterior ISO and don’t want to sandwich the walls with vapor barriers. Thanks

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  1. GBA Editor
    Martin Holladay | | #1

    The area behind a shower is small. As long as the wall assembly is dry on the day that you install the interior vapor barrier, go ahead with the job and don't worry. The two vapor barriers aren't going to be a problem in this situation.

  2. Stan Smith | | #2

    Ok thanks Martin. I guess it brought a little extra worry just because all of the humidity from steam and what not.

  3. Expert Member
    Malcolm Taylor | | #3

    What are you doing elsewhere in the house?

  4. Stan Smith | | #4

    No vapor barrier elsewhere, just unfaced batts

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