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Unread 01-10-2006, 03:38 PM   #1
tilingisfun
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joint btwn cement board/green board

i am tiling a tub surround. the cement backer board is screwed to the studs and matches up with the greenboard in areas that i am not tiling. should my edge tiles line up with the edge of the backer board or should they overlap the green board? how much overlap? do I tape and cement btwn the backer board and the green board? thank you!!
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Unread 01-10-2006, 04:39 PM   #2
bbcamp
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Yes, you tape and mud the joint between the backer and the green boards. Use either drywall tape and compound or thinset and backerboard tape. Your joint must be outside the "wet area" of the shower, or outside of the shower curtain or door. You can let your tile fall where it has to, but it will be easier if the edge falls on the greenboard.
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Unread 01-10-2006, 07:14 PM   #3
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Curious Bob - do you really need to tape the joint if the tile ends up spanning the gap, and it is outside the wet area? Thought I read somewhere that it really was not necessary, especially if we are talking about a slight overlap. I might be wrong on that one.
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Unread 01-10-2006, 07:16 PM   #4
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Welcome aboard, Tiling. Please drop a first name.

Don,

Taping is good. Might not be absolutely necessary, but why not?
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Unread 01-10-2006, 09:49 PM   #5
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Brian (a_cut_above):

You've got at least two threads started (one of which was started for you by a moderator to prevent the same situation we have here) and have questions out on at least three others. Makes it impossible for anyone who wants to help to keep up with the history of your project and just brings confusion to the other threads.

Please choose one of your threads to ask your questions on and we'll see if we can get it combined with your other thread so we can help you with your project. We can re-name the thread any way you might like. You can ask any kind of question there that you like. Help us help you, OK?
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Unread 01-11-2006, 05:21 PM   #6
Rather-Be-Boating
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I guess "why not" is a fair perspective.

Do you also tape the inside corner between the wallboard ceiling and CBU wall if tiling all the way up to the ceiling? I was thinking of this from the perspective of a second floor bathroom, with an attic above. Seems any wall that continues onto an untiled section would be a "yes", but what about walls that are fully within a tub/shower, such as a typical back wall??
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Unread 01-11-2006, 06:04 PM   #7
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I tape and mud all joints in the wallboard, Don. If for no other reason than to stop air movement.

Or perhaps because I'm obsessive. Hell, I dunno, but if there's a joint, it gets taped.

My opinion; worth price charged.
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Unread 01-11-2006, 06:35 PM   #8
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Air movement - exactly what I was thinking there CX.

Besides - we all know how much fun it is doing drywall work!!! So why not add a little more! I think I have a greater variety of drywall knives than I do beer in the fridge!!!
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Unread 01-11-2006, 06:38 PM   #9
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I got way more drywall knives.


And I don't do drywall.
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