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Thread: Insulation behind HardiBacker?

  1. #1
    DIY Junior Member a.y1320's Avatar
    Join Date
    Dec 2009
    N.W Indiana

    Default Insulation behind HardiBacker?

    Hello, Im new to this site and have a question about my bathroom remodel. The bathroom I'm remodeling is surrounded by all interior walls (bedrooms). I am about to install a new tub and tile surround.
    If I insulate the walls before I put up the cement board, will it help sound proof the bathroom? I am also worried about the moisture being trapped by the bats of insulation. I am a total newbie and need some guidence,
    thanks in advance..

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    Insulation will help, but not stop noise transmission. You should have a vapor barrier behind the cbu, so use unfaced batts, then put some plastic up. If this is a shower, run it down over the liner. If it is a tub, run it down over the tiling flange and you should be fine.

    For tiling help, check out www.johnbridge.com.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014


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