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Thread: Replacing tub with walk-in shower

  1. #1

    Default Replacing tub with walk-in shower

    When building the shower floor, is it appropriate to use only cement board
    and nothing else, or do I need to apply a PVC membrane under the cement board?

  2. #2
    Homeowner geniescience's Avatar
    Join Date
    Nov 2005
    humid summers hot, humid winters cold


    no, and no.

    Read up more on this and ask more questions later. See johnbridge.com forums.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    No cement board on the floor at all (but use it on the walls). Converting from a tub to a shower usually will require changing out the trap and probably more of the drain line from 1.5" to 2", plus, it should be moved to the center of the floor. The floor needs to be sloped prior to putting on the waterproofing, or you'll end up with stagnent water sitting under the tile. Neither tile nor grout is 100% waterproof, thus the need for the waterproofing under it to channel everything to the drain.

    Other than checking out www.johnbridge.com as suggested, you might want to check out www.schluter.com and look at the Kerdi product. They have a couple of premade shower pans specifically for replacing a typical tub; one has the drain centered (more traditional) and the newest one (early this year) has the drain near the end. You still need to make sure you have 2", though.
    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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