AquaDefense over top layer of mud.

Discussion in 'Shower & Bathtub Forum & Blog' started by CK, May 24, 2012.

  1. CK

    CK New Member

    Feb 14, 2012
    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    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.
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  4. johnfrwhipple

    johnfrwhipple BATHROOM DESIGN & BUILD for both Canada & the US

    Jul 20, 2009
    Design Work World Wide: Bathrooms Vancouver Area
    North Vancouver, BC
    What are you using as a mud bed overtop of the Aqua Defence?

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