Insulation behind HardiBacker?

Discussion in 'Remodel Forum & Blog' started by a.y1320, Dec 12, 2009.

  1. a.y1320

    a.y1320 New Member

    N.W Indiana
    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    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
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