Insulation behind HardiBacker?

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

  1. a.y1320

    a.y1320 New Member

    Dec 12, 2009
    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

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    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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