greenboard and hardiboard issues

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Bob Affleck

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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
 

Jimbo

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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.
 

Jadnashua

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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.
 

Geniescience

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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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