greenboard and hardiboard issues

Discussion in 'Shower & bathtub Forum & Blog' started by Bob Affleck, Apr 23, 2006.

  1. Bob Affleck

    Bob Affleck New Member

    Messages:
    1
    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. jimbo

    jimbo Plumber

    Messages:
    8,997
    Location:
    San Diego
    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. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,798
    Location:
    New England
    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.
  4. 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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