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Old 04-29-2019, 07:18 PM   #1
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Uneven CBU seams


doing first time bathroom renovation so i'm making some mistakes while I go.

I did not put a stud in behind the 2 seams in the pictures. they are not flush together by about 1/3" at the worst spots. some spots are flush.
other than removing the cement board and putting a stud in can I thinset the seam, waterproof it with RedGuard and then put on coats of drywall mud until the seam is flush enough?
FYI I'm tiling over the walls in question with 12x24" tile so my room for error is less than usual.
thanks so much

PS sorry those pics should be turned 90degrees right
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Old 04-29-2019, 07:35 PM   #2
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Re: Uneven CBU seams


What is the most distance to the stud.

On the first one will you tile over to the edge of the window.
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Old 04-29-2019, 09:39 PM   #3
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Re: Uneven CBU seams


thanks for replying.
distance from seam to nearest stud is only 4-5 inches. i'd have to measure it.
i'm thinking best solution is just apply thinset until i can make the seam flush enough to tile on.
my dads in the business and thought because its cement board and pretty stiff it should hold up ok. he thought i should use drywall mud to cover the seam and make it flush but that doesnt sound right if i'm going to tile over it later.
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Old 04-30-2019, 06:02 AM   #4
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Re: Uneven CBU seams


Do it right, remove the CBU, install a stud or other support behind the edges and reinstall the cbu. You are at the stage now that you can not afford to cheap out. Drywall mud behind tile will be a disaster, so stick with the normal methods of sealing the joints.
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Old 04-30-2019, 09:02 AM   #5
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Re: Uneven CBU seams


thanks for the reply Chandler.
do you think using a couple of layers of thinset to smooth out the joint is not a good option?
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Old 04-30-2019, 03:34 PM   #6
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Re: Uneven CBU seams


Quote:
couple of layers of thinset
On a wobbly unsupported edge of CBU, absolutely not.
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Old 04-30-2019, 11:22 PM   #7
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Re: Uneven CBU seams


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Originally Posted by chandler48 View Post
On a wobbly unsupported edge of CBU, absolutely not.
thanks for your honest replies chandler. i'll put the studs in this weekend.
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