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Thread: Thinset Thickness

  1. #1

    Default Thinset Thickness

    Hi,


    I have installed cement board surrounding the tub/shower alcove and am in the process of using thinset to cover joints. I have a small area that need some levelling and am wondering how thick I can go with the thinset to even out the inconsistenices. Any thoughts?

  2. #2
    DIY scratch-pad engineer leejosepho's Avatar
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    I believe you can build it up as much as you want or need as long as you do it a little at a time ... like about 1/4" or so.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Hopefully, you're using the special alkalai resistant mesh tape on those joints. It is ususally easier to tape them when tiling, otherwise it is likely you'll end up with a hump. Finishing cbu in prep for tile is not like doing drywall, it doesn't have to look pretty. Most thinsets can go up to 1/4" in one app. A medium bed mortar (often called granite and marble mortar) can go up to around 1" or so, depends on the brand. Also, while it is very important to get full coverage when tiling a floor, one technique that can be used for walls is the 'spot' method. Bascially, depending on the size of the tile, you back butter it, then put big dabs of thinset in 'dots' symmetrically on it...then smush it on the wall until it is lined up where you want.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    ACO Shower Drain Sales johnfrwhipple's Avatar
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    Default Thin-set Thickness = 1/4" for most 1" for a few

    Post(s) deleted by John Whipple
    Last edited by johnfrwhipple; 03-18-2014 at 07:47 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.

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    ANSI A118.3 defines the spot method of setting tile, and is an approved method. It is not applicable with some tile (such as transparent, translucent, or those subject to variations in color based on moisture), but is viable with many tile. It's still better to get your setting surface flat and true before you try to set the tile.

    Quote Originally Posted by jadnashua View Post
    A medium bed mortar (often called granite and marble mortar) can go up to around 1" or so, depends on the brand.
    And, John Whipple is saying the same thing about max depth of mortar as I. He just likes to throw more darts.

    Thinset isn't really designed as a surface filler/flattening material - using it as such might lead to problems. A medium bed mortar, as long as the max thickness does not exceed the manufacturer's recommendation, should work without issues, though.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6
    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 07:47 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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