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Thread: aqua defense over mud pan

  1. #1
    DIY Junior Member divisi's Avatar
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    Default aqua defense over mud pan

    I have just had a mud pan over vinyl shower pan liner installed. My question is can I put AquaDefense on top of the mud under the tile? Will this cause some kind of problem. I want the shower to be water proof and also plan to do the joints and walls.
    Thanks in advance for any hel

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    Retired Defense Industry Engineer jadnashua's Avatar
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    First, if the liner is flat on the floor without a preslope underneath it, it is not installed properly and you should start over! THen, multiple waterproofing layers is never a good idea. The waterproofing layer MUST be sloped to the drain, and that is NOT the tile. Depending on the type of drain you use, something like a clamping drain, which is probably what you have in there now, is not compatible with a surface waterproofing layer. There is definitely more than one way to produce a leak free shower, but it doesn't sound like yours got started out properly for any of them.
    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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    Default Aqua Defence over mud bed and liner "Belt and Suspenders"

    Post(s) removed by John Whipple
    Last edited by johnfrwhipple; 03-16-2014 at 07:33 AM.


    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.

  4. #4
    Retired Defense Industry Engineer jadnashua's Avatar
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    Waterproof and vapor proof are not the same thing. You can be one without being the other (think Gortex). I would not want two surfaces with that absorbent layer of deckmud in between. My personal opinion.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  5. #5
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Default Aqua defense over mud pan - yes or no?

    Post(s) removed by John Whipple
    Last edited by johnfrwhipple; 03-16-2014 at 07:33 AM.


    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.

  6. #6
    DIY Junior Member divisi's Avatar
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    Johnfrwhipple,

    I noticed in one of your other posts you said...

    "Using a liquid membrane over a fresh mortar bed can be tricky. Unless you have access to a rapid setting mortar like Mapei's Mapecem Screed Mortar Fast Setting you need to wait while the mud bed cures and most of the moisture has left the install. With a traditional 4-1 mix that can be 4 weeks. With a product like Latecrete's 3701 you can Hydro Ban over top in 72 hours and with Mapei's Mapecem Fast Setting Screed Mortar as fast as 24 hours"

    I can get the Latecrete 3701... So if I use it and wait the 72 hours before using a product like Hydro Ban on top of the mud pan will it cause a problem? The previous shower leaked and I would like to be extra sure there won't be a leak this time.

  7. #7
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) removed by John Whipple
    Last edited by johnfrwhipple; 03-16-2014 at 07:33 AM.


    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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