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Old 04-23-2014, 08:01 PM   #1
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What to do with cement board to drywall seam?


So Im working on my second bathroom project. I've got my cement board and drywall up but the gap on one of the walls where the to materials come to together looks pretty rough.

Does the drywall need to be fixed up more before I tape the seam and mortar it or could I go ahead and do it now?





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Old 04-23-2014, 08:12 PM   #2
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I would tape it now using thinset and spackle it after the tile is grouted.
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Old 04-23-2014, 10:56 PM   #3
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I would use drywall compound, using thinset will make that seam very difficult to hide unless you're tiling over it.
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Old 04-24-2014, 12:14 AM   #4
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Quote:
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I would tape it now using thinset and spackle it after the tile is grouted.
Drywall mud, when joining cement board to drywall. I would opt for setting-type drywall compound, in an area that could possibly see direct moisture. The setting-type compound will also fill in those larger gaps better than regular mud. Top coat with regular drywall mud, if necessary, on the areas that won't be under tile. Also, it looks like some of the paper facing has been removed on the edge of that drywall. I would put some more screws in, where there is paper.

Last edited by Seattle2k; 04-24-2014 at 12:16 AM.
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Old 04-24-2014, 07:31 AM   #5
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Drywall mud, when joining cement board to drywall. I would opt for setting-type drywall compound, in an area that could possibly see direct moisture. The setting-type compound will also fill in those larger gaps better than regular mud. Top coat with regular drywall mud, if necessary, on the areas that won't be under tile. Also, it looks like some of the paper facing has been removed on the edge of that drywall. I would put some more screws in, where there is paper.
Didn't think of that. I have used the Durabond Dual 90 and it is tough stuff. My thought was while grouting the regular drywall mud would get scratched.
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Old 04-24-2014, 07:53 AM   #6
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Well this whole area might be covered with tile. If so could I just use mortar?

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Old 04-24-2014, 08:16 AM   #7
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Well this whole area might be covered with tile. If so could I just use mortar?

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If you can get it smooth enough to put the tile you are using over it. But I would still tape it . I am guessing you are working on it now because it looks like you are using your phone to post (Sent from my Nexus 5 using Tapatalk). Not knowing all the facts it is hard to give you a good answer.
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Old 04-24-2014, 08:31 AM   #8
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No. I'm at work. They have this site blocked on our PCs for some reason.

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Old 04-24-2014, 09:21 AM   #9
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The more info about the project the better some one can help you. The pics are great but type of mortar and tile, size, thinset it is frustrating giving some one advise and then finding out that they are using a different application. Its like going to the auto parts store and asking for a spark plug. They want to know make, model, year,engine. Sorry for rambling on but I gotta go.
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Old 04-24-2014, 10:49 AM   #10
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6 inch ceramic tile, mapai thin set, don't remember the exact kind.

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Old 04-24-2014, 03:09 PM   #11
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If it were me I would actually cut out and replace that section of sheetrock to get a better edge. And if it were me I would tape the seams with fabric tape or FG matte and then apply waterproofing membrane to the entire shower walls overlapping onto the sheetrock. And I would have my tile layout spill over to the sheetrock so that the seam would be completely covered.
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