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Thread: Installing cement board behind my shower

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  1. #1
    DIY Junior Member KatrinaK's Avatar
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    Default Installing cement board behind my shower

    Hi Everyone,

    I am remodeling my bathroom and am at the stage where I need to put the cement board up behind my shower. There is some vapor barrier there, but on the interior walls it only goes about half way down the wall. Does anyone have any thoughts on if I need to add more vapor barrier? There used to be drywall behind the shower, I'm not sure if having cement board now changes things?

    Also, I am not sure how far down the cement board should go. The drywall that was there previously looked like it was just above the tub line, not touching it. This is one of those shower/tub combos.

    Any thoughts on this would be greatly appreciated, I am very new to the do-it-yourself world!

    Katrina

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    Retired Defense Industry Engineer jadnashua's Avatar
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    You do want a vapor barrier and bring it down lapped over the tub's tiling flange. You only need the cbu up to the height of the showerhead, but you can go further. To keep the cbu from bowing out, you can shim the studs, notch the studs (and recess the tub's flange so it is flush with the studs), or stop it slightly above the flange and make sure the tile is more than half supported on the cbu. The tile should not be touching the tub, but a slight gap that is caulked.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

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    DIY Junior Member KatrinaK's Avatar
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    Thank you Jim, this helps a lot !

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    ACO Shower Drain Sales johnfrwhipple's Avatar
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    post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-17-2014 at 04:39 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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    DIY Junior Member galerie's Avatar
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    Can LATICRETE Hydro Ban be installed on Durock Backberboard?

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    In the Trades mtcummins's Avatar
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    Correct me if i'm wrong, but I believe you should NOT have both a vapor barrier behind CMU and waterproofing over it. Its one of the other, and the waterproofing over CMU is the better option by far.

    Personally, I use Kerdi on walls and Ditra on floors with modified thinset (typically versabond), with no problems. I know that John Bridge over at his excellent tile forum (that JW above doesn't seem to like too much) does the same at least with Ditra, and he's been doing it a long time w/o problems. However, it will void the warranty if you're worried about such things, so its your call. The other options he suggested are also good ones, I just happen to like Schluter's products.

    Can't tell you about hydroban on CMU, maybe someone else can, or read the specs on it. it should tell you the suitable applications.

    With most waterproofing, CMU is overkill, though I like its stability and sometimes will use it. With Kerdi, I generally just apply directly to MR gyp board. Not sure what the other waterproofing methods require, but this is how Kerdi is specified to be installed.

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    ACO Shower Drain Sales johnfrwhipple's Avatar
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    post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-17-2014 at 04:39 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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