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Thread: greenboard and hardiboard issues

  1. #1

    Default greenboard and hardiboard issues

    I am remodeling my bathroom and I have installed hardibacker in the tub and shower areas and greenboard everywhere else. I have been told too many different things on how to finish the joint between the hardibacker and the greenboard. Do I use tape and joint compound or do I use fiberglass mesh and thinset?
    My next issue is: I am tileing on both the hardibacker and the greenboard. Do I have to use mastic on the greenboard and thinset on the hardibacker? My project is at a stand still until I find out. Thanks

  2. #2
    Plumber jimbo's Avatar
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    Default

    Best advice is to visit our friends at the tile forum, www.johnbridge.com They are really good.


    Just for discussion, I would offer that there is not necessarily one right answer. I would use mesh tape and waterproof joint compound. You may be able to use regular tape and joint compound. I would not use thinset.

    I believe that for areas not actually in the shower, you can use mastic or thinset on greenboard or hardibacker.

    That's my two cents. Check the forum I mentioned for more complete advice.

  3. #3
    Retired Defense Industry Engineer jadnashua's Avatar
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    Thinset will work fine on the junction of the cbu and greenboard. If the seam will be entirely underneath the tile, treat it just like you would a cbu/cbu seam.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  4. #4
    Homeowner geniescience's Avatar
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    Default Vapor barrier behind the wet areas?

    Bob

    What waterproofing did you put behind the wet area? Better put a liquid membrane now if you have nothing yet. Redgard and Laticrete 9235 are known to be good.

    Thinset is a must in wet areas. Works well everywhere else too. Mastic is an optin in dry areas.

    David

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