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Taping cement board / drywall seams

35K views 17 replies 4 participants last post by  jaketrades  
#1 ·
I'm redoing my bathroom and have a few cement board / drywall seams.

In between Sheetrock seams I'll use joint compound and tape.

In between cement board seams I'll use cement board mesh tape and thinset mortar.

What do I do between sheetrock and cement board seams?


Thanks guys!

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Discussion starter · #10 ·
So first time using thinset for the cement board seams and joint compound for the cement board to sheet rock transitions. It's not easy to get it right. Now I now why sheetrock needs to be perfectly flush.

Got a few questions-->

1. How do I fill in these large voids of space

2. How do I patch large holes? Cut out a larger piece and replace with fresh sheetrock?

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Discussion starter · #12 ·
I replaced large holes with new Sheetrock pieces.

With he smaller gaps in the curved areas I used mesh tape->mud -> multiple small strips of prefolded tape to follow the curve without creating bubbles.



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Now I've got a couple more problem spots to fill in.


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Discussion starter · #18 ·
I'm going to paint part of the cement board. Should I skim coat with mud first?

When Painting over thinset seams, should i sand them down first and then apply mud to get it smooth?

For the holes near the copper, can I put mesh tape and some mud, followed by redguard? Or do I need to use thinset?
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Thanks.




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