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-   -   Moisture barrier under cement board in shower (https://www.askmehelpdesk.com/showthread.php?t=11816)

  • Aug 14, 2005, 07:34 PM
    tony t
    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
  • Aug 16, 2005, 06:04 AM
    speedball1
    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
  • Aug 16, 2005, 08:47 PM
    tommytman
    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
  • Aug 16, 2005, 08:56 PM
    tommytman
    Just to make sure... you said under?? Are you putting the backer board on the floor of the shower?

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