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    tony t's Avatar
    tony t Posts: 1, Reputation: 1
    New Member
    		  
    #1

    Aug 14, 2005, 07:34 PM
    Moisture barrier under cement board in shower
    Hi, I'm framing in a new stall shower, have looked at web sites on the subject and most experts suggest putting a moisture barrier under the cement board. I can see why that would be good. One company, which produces a thick (15 mil) membrane for this application, also shows a detail in which a silicone sealant is used between the membrane and the backer board. There is no mention of brand of sealant, and it doesn't seem they sell it. This is a first for me, and I'd like to learn (from an impartial third party) if this is standard practice.

    Thank you

    Tony Tammer
    speedball1's Avatar
    speedball1 Posts: 29,301, Reputation: 1939
    Eternal Plumber
    		  
    #2

    Aug 16, 2005, 06:04 AM
    Quote Originally Posted by tony t
    Hi, I'm framing in a new stall shower, have looked at web sites on the subject and most experts suggest putting a moisture barrier under the cement board. I can see why that would be good. One company, which produces a thick (15 mil) membrane for this application, also shows a detail in which a silicone sealant is used between the membrane and the backer board. There is no mention of brand of sealant, and it doesn't seem they sell it. This is a first for me, and I'd like to learn (from an impartial third party) if this is standard practice.

    Thank you

    Tony Tammer
    Hi Tony,
    I waited for another expert to jump in as I just pipe in drainage and water and don't build the shower floor or enclosure.
    Here's a link that may take some of the mystery out of it. Click on;
    http://www.compotite.com/skyblue.html
    To see diagrams and instructions. Good luck, Tom
    tommytman's Avatar
    tommytman Posts: 153, Reputation: 2
    Junior Member
    		  
    #3

    Aug 16, 2005, 08:47 PM
    Yes a moisture barrier is recommended and if you are putting in a shower pan I believe you should run the barrier inside the shower pan liner.

    Check johnbridge.com and the forums there. They have some people that really know shower stalls over there.

    Tom
    tommytman's Avatar
    tommytman Posts: 153, Reputation: 2
    Junior Member
    		  
    #4

    Aug 16, 2005, 08:56 PM
    Just to make sure... you said under?? Are you putting the backer board on the floor of the shower?
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