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Thread: AquaDefense over top layer of mud.

  1. #1
    DIY Junior Member CK's Avatar
    Join Date
    Feb 2012

    Default AquaDefense over top layer of mud.

    I am currently constructing the mud floor bed for my shower. I have already poured the pre-slope layer of mud (correct slope in place), used AquaDefense and flood tested. I am getting ready to pour my top layer of deck mud.

    My question to everyone is can i put another layer or two of AquaDefense over the top layer of mud? And if it is not recommended, can someone please explain to me why?

    Thank you everyone for your replies.

  2. #2
    Retired Defense Industry Engineer jadnashua's Avatar
    Join Date
    Sep 2004
    New England


    A second layer of waterproofing would cause things to stay wet! The drain has two levels of entry: the weep holes that drain the setting bed (the liner directs any moisture there), and the tile on the finished side direct water to the top of the drain. With another layer below the tile, there'd be a lip at the drain blocking any moisture that did get there from going anywhere but evaporating through the grout. This process can take awhile, and thus, you'd have the grout wet all of the time, opening things up for mold and other issues.

    If you wanted to keep any moisture from getting to the setting bed, an acceptable method would be to use a surface membrane (sheet or liquid) that then mated up with a drain designed for it. You can't do that now unless you wanted to tear things up and replace the drain.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  3. #3
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Jul 2009
    North Vancouver, BC
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    What are you using as a mud bed overtop of the Aqua Defence?


    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

    Always get construction advice double checked by your local city hall. Flood Test Every Shower - Every Time.

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