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Unread 08-11-2003, 03:27 PM   #1
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Here's a semi-complicated question; well, for me, anyway. In building my shower, I will be using Wonderboard (or other backer board) in the shower area itself, and sheet rock in other parts of the bathroom. I'm pretty sure I don't want any of the Wonderboard to extend beyond the tile, so the question arises, "what do I do to transition from it to the sheetrock?"

I guess I'm making an assumption here that one uses thinset on the Wonderboard to attach the tile on the walls. I suspect that thinset isn't good on the gypsum board; that mastic is proper there. True?

I also assume that there will be tiles that will partially cover Wonderboard and sheetrock at the same time. Adhesive? A little of each on the appropriate substrate? Mastic on Wonderboard? Thinset on gypsum?

Just for other conversation, yesterday (Sunday) I hung two sheets of drywall on the ceiling of the bathroom (each sheet was done in two pieces). I did it single handed, without a deadman or lift. My arms are so sore today I can hardly stand it. I never could have made it without my Milwaukee drywall gun.


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Unread 08-11-2003, 04:53 PM   #2
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Hi LRod...any relation to A Rod???

Welcome to the board.

Mastic isn't a good thing where it gets wet. The pros will be along to set you straight on that one.

On the transition in my bathroom I went from the CBU (backerboard) to the GREEN sheetrock. Tile was only on the concret board which abutted the sheetrock.

The pros will be along soon to set it right. I am a DIY'r with much still to learn!


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Unread 08-11-2003, 04:57 PM   #3
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If the drywall / CBU transition is outside the tile area - use sheetrock joint tape, compound, etc.

If the drywall/ CBU transition is inside the tile area - use CBU tape, thinset, etc.

Under no circumstances am I suggesting the use of mastic anywhere near a shower.

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Unread 08-11-2003, 05:37 PM   #4
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L-rod, if you're asking if the thinset will stick to the drywall, the answer is yes, better than mastic will. I assume you mean the tiles right over where the wonderboard and the sheetrock meet.
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Unread 08-11-2003, 06:22 PM   #5
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I've been pondering the exact same thing.

I have a corner to worry about at one end of the tub and a flat wall to worry about at the other. I'm thinking bullnose on both so that the edge of the bullnose just covers the joint (or buts up to the corner in that case). I might use a mud cap or something similar (I don't know all the names yet) if it were all corners.

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