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Thread: Fiber cement board (hardibacker) question

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  1. #1

    Default Fiber cement board (hardibacker) question

    Hi everybody! I just installed hardibacker boards in my bathroom. But I had to remove 1 pc 'coz I made a mistake. Can I still use it again? I screwed it every 8 inches around the edges and along every stud. Can I just cover the hole with thinset? Thanks!

  2. #2
    One who lurks Basement_Lurker's Avatar
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    The board isn't structural and it's not the waterproofing, so it should be fine as long as it's still in good condition.

  3. #3

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    I am no master tile layer but, I did just tile my bathroom and kitchen. I would say sure go ahead and reuse it. Those little holes are not going to make much of a difference especially if you are using larger tiles. I had some large gaps between my hardibacker due to the strange shape of my kitchen and I just filled them in with thinset. No problems with it so far. I have one tip I tell everyone, if you are using porcelain tiles make sure to lay them with a thinset that contains laytex or use a laytex addative. Porcelain tiles are very heavy and regular thinset doesnt cut it. Your tiles will become loose if you use a regular thinset. So good luck with the project.

  4. #4

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    Basement_Lurker,

    It's still in good condition except for the holes. Thanks!

    Kylee,

    I'm going to use 1"x1" glass mosaic tiles in 12"x12" mesh. You still think it's ok? Thanks!

    cris

  5. #5
    Retired Defense Industry Engineer jadnashua's Avatar
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    The holes won't hurt. You need a vapor barrier behind the cbu, or a waterproofer on top of it. If you use one on top of it, then you need to tape and thinset the joints first (assuming you use something like RedGard which is a paint on one). The joints, regardless, should be taped with the cbu specific, alkali resistant mesh tape. It is easier to do this while tiling, otherwise it is easy to make 'speed bumps'. The tape and thinset on the seams is for reinforcement, not looks, so you don't want to create a hump and taper.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  6. #6

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    Jim,

    Thanks for the advice! I just finished installing the hardibacker over a vapor barrier. How can I join the hardibacker ends with the existing drywall ends on the wall and on the ceiling? And do I need to apply caulking between the tub and the hardibacker? Thanks again!

    Cris

  7. #7
    Retired Defense Industry Engineer jadnashua's Avatar
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    For any area under tile, use the thinset and the special tape. Try to plan the tile to lap over onto the drywall at the edges if you can, it is easier to cover those edges, and in a dry area, tiling to drywall is fine. If you aren't going to tile to the ceiling, and you already have cbu up, try covering the area with a thin skim coat of drywall compound, then prime and paint. Since above the showerhead is considered dry, you can tape the ceiling/wall joint with drywall tape and compound...preferably a setting compound rather than the premixed stuff in a bucket. That stuff doesn't soften when it gets wet. If you use a good quality paint and primer, though, you would be okay, but better to use the setting stuff.

    Ideally, the cbu comes to within about 1/4" of the tub surface. Caulk that joint unless you opt for something like Dilex from www.schluter.com. If you use that on the tub surface and one of their other expansion joint materials in the corners, you shouldn't need any caulk at all. It is also recommended to caulk the corners at the wall junctions rather than grouting.
    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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