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Thread: Green/Cement Board Overlapping Tub Flange vs Leaving Gap Between Board and Flange

  1. #16
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 08:51 AM.


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  2. #17
    DIY Junior Member CF's Avatar
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    Now I'm adding to the confusion. I am NOT interested in using Kerdiboard or Wedi at this time.

    Is there a way to compare the durability of the waterproofing systems from Kerdi, Nobel, Laticrete, Mapei and Ardex? For example, how do the sheet waterproofing membranes from Kerdi and Noble compare to the liquid applied systems from Laticrete, Mapei and Ardex?

    As you say, the hardest part is the connection of the tub to the backer board. The Kerdi installation instructions show Kerdi-Band bridging the backer board to the tub. Thin set was troweled on to the backerboard and a bead of Kerdi-Fix on the tub flange. Then the Kerdi-Band was pressed into both of them. Your first picture in post #3 looks exactly like that. Your picture in post #5 shows another example with Hydro Ban liquid coating on the backer board and Kerdi-Fix at the tub flange. In this case did you fill the gap between the backer board and tub using Kerdi-Fix only? There doesn't appear to be a sheet membrane between the tub and backer board. I'm assuming the Kerdi-Fix is the dark grey material in the picture.

    Thanks for your help. This is very informative.

  3. #18
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
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    jfrwhipple@gmail.com - www-no-curb.com - 604 506 6792

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  4. #19
    DIY Junior Member CF's Avatar
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    Thanks again for your help. The confusion is much improved. For the sheet membranes, Noble appears to be the easiest for the DIYer to buy. The have an online store at noblecompany.com. Home Depot can get Schluter-Kerdi but I don't think they stock it.

    Is there a durability advantage to using cement backer board vs. fiber cement (Hardie) or gypsum backer board (DensShield or drywall)? The cost difference is not that significant. If somehow the membrane failed would the cement backerboard help or hurt or make no difference?

    For the Noble sheet membranes, do you prefer the Noble TS or the Noble Wall Seal for wall applications? The Wall Seal is 0.025" thick and Kerdi is 0.008".

    Is there still a debate as to whether Kerdi should be installed with modified thin-set vs non-modified thinset? Their instructions still call for non-modified thinset.

    Is there a problem with the membrane seams telegraphing through to the tile? Does that affect whether you install the sheet membrane vertically or horizontally (shingle style)?
    Last edited by CF; 10-18-2012 at 06:20 AM. Reason: Found Kerdi thickness was 8 mil

  5. #20
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 08:51 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. #21
    DIY Member Freddie's Avatar
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    Hi John,

    Not so keen on using drywall or Denshield (which has a layer of drywall) in the shower even with topical coverage...just in case. Cement board seems the obvious and proven alternative with hydroban on top. I will have a vapour barrier behind the cement board. Should water get into the cement board it's not getting into the wall. Now the question is where will that water go if the bottom of the backerboard is sealed at the base / at the junction to the shower acrylic base? Looks like it will run down the backer board and collect at the bottom with no place to drain to.

    Would it make sense to just not seal the bottom of the backerboard with hydroban , nor silicone the gap between the tile and the shower pan so that water candrain into the shower pan?

  7. #22
    Retired Defense Industry Engineer jadnashua's Avatar
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    Don't use a topical waterproofer with a vapor barrier behind the sheet goods...one or the other, not both.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  8. #23
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Post(s) deleted by John Whipple
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    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.

  9. #24
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    Default Using Kerdi Band over Green EBoard to seal to the tub's tile flange

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    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.

  10. #25
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    Default Green EBoard Shower Update

    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 08:52 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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