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Backerboard To Drywall Seam

 
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Old 11-14-2018, 10:52 AM   #1
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Backerboard To Drywall Seam


Have a case of installed backerboard around a tub surround that was already tiled. But they left the unfinished backer extend about two inches on the sides into the drywall area.

So to tape and skim the two surfaces - 20 min mix with mesh? Is okay over backer material?

Also, where the side backer walls meet the ceiling, how to treat the gap? Mesh'd be hard to use on the inner corner, and I hate to caulk !


BTW: searched this forum, thinking there was something about this...
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Old 11-14-2018, 11:11 AM   #2
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Re: Backerboard To Drywall Seam


I've treated it like sheetrock and used mesh tape and 45 (I'm not fast enough to spread 20 and clean it up)

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Old 11-14-2018, 11:25 AM   #3
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Re: Backerboard To Drywall Seam


Use paper tape or fibafuse. Mesh does nothing when it's all dry. (And the debate continues...) I would use 5 or 20 and get it all done.
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Old 11-14-2018, 11:43 AM   #4
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Re: Backerboard To Drywall Seam


Agree with other replies, tape and mud no problems .
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Old 11-14-2018, 11:51 AM   #5
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Re: Backerboard To Drywall Seam


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Use paper tape or fibafuse. Mesh does nothing when it's all dry. (And the debate continues...) I would use 5 or 20 and get it all done.
Didn't know if paper tape was alright over the backer... You are quicker than me, with that 5.

Whenever I apply backer/cement board, I end up just shy of the border so it's clean, no seams to deal with. So long as it's sealed.

- Does the backer need primed with the mud or 20 min?

Last edited by artinall; 11-14-2018 at 11:55 AM.
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Old 11-14-2018, 11:56 AM   #6
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Re: Backerboard To Drywall Seam


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Didn't know if paper tape was alright over the backer... You are faster than me, with that 5.

Whenever I apply backer/cement board, I end up just shy of the border so it's clean, no seams to deal with. So long as it's sealed.

- Does the backer need primed with the mud or 20 min?
Primer not necessary, but you might want to damp wipe any cement dust off. It doesn't have to be bone dry, either.

You can mix your setting compounds, so 5 and 20 will give you something in between.
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Old 11-14-2018, 01:13 PM   #7
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Re: Backerboard To Drywall Seam


Believe it to be Hardiebacker but will have to confirm...
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Old 11-14-2018, 07:43 PM   #8
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Re: Backerboard To Drywall Seam


Could also run another row of tile or bull nose to cover the seam? Or some complimentary mosaic tile?

Obviously the mud would be faster though
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Old 11-14-2018, 08:22 PM   #9
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Re: Backerboard To Drywall Seam


Use Kerdi band, bedded with mortar, covered with hot mud for finish.

Tom
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Old 11-14-2018, 08:43 PM   #10
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Re: Backerboard To Drywall Seam


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Use Kerdi band, bedded with mortar, covered with hot mud for finish.

Tom
I like the looks of that, and lightweight. Next time I do!


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Originally Posted by onmywayup View Post
Could also run another row of tile or bull nose to cover the seam? Or some complimentary mosaic tile?

Obviously the mud would be faster though
Nice thought but that would extend beyond the wall of the tub, at the base...and a window interferes.

Last edited by artinall; 11-14-2018 at 08:49 PM.
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Old 11-17-2018, 09:05 AM   #11
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Re: Backerboard To Drywall Seam


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Use Kerdi band, bedded with mortar, covered with hot mud for finish.

Tom
Do you plan your seam behind the bullnose tile then hot mud to the tile after its installed
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Old 11-17-2018, 09:47 AM   #12
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Re: Backerboard To Drywall Seam


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Do you plan your seam behind the bullnose tile then hot mud to the tile after its installed
Normally end up doing 1 coat of hot mud about 1/4" into the tile area, prior to setting the tile.

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Old 11-17-2018, 09:57 AM   #13
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Re: Backerboard To Drywall Seam


Two different situations. The blueish is Noble brand.

On the straight wall just the liner was used, no need for a band. It covers the seam by 4-5". The pencil line is where the tile trim goes. No bullnose on this one.

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Old 11-17-2018, 09:59 AM   #14
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Re: Backerboard To Drywall Seam


I thinset the cracks and mesh and at times thinset seams for fill but use Aqua Defense to embed fleece in transitions. I dont know whats better or correct.


Just like the tub flange on acrylic tubs......the tile setter I use says he just packs it with thinset and mesh while setting but that seem like a crack waiting to happen to me. I may be wasting my time but I will silicone the gap the use Aqua defense in those transitions onto the tub for some flexibility.
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Old 11-17-2018, 10:09 AM   #15
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Re: Backerboard To Drywall Seam


I use Kerdi Fix to fill the gap, normally leave 1/4" gap, place a piece of band over it. Make sure you mask the tub deck if using Kerdi-Fix....

I also relieve the back so the board sits flat on the flange. No screws within 6" of the deck.

Tom
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Old 11-17-2018, 12:37 PM   #16
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Re: Backerboard To Drywall Seam


Quote:
Originally Posted by tjbnwi View Post
I use Kerdi Fix to fill the gap, normally leave 1/4" gap, place a piece of band over it. Make sure you mask the tub deck if using Kerdi-Fix....

I also relieve the back so the board sits flat on the flange. No screws within 6" of the deck.

Tom
Never used kerdi fix. I guess it's flexible/elastic.
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Old 11-17-2018, 04:52 PM   #17
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Re: Backerboard To Drywall Seam


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Never used kerdi fix. I guess it's flexible/elastic.
Yes, and sticky as——well.....

Good luck getting it off something you don’t want it on.

That’s why you tape off the deck completely. Leave yourself courtesy tabs to pull the tape off. Don’t run a piece of tape more than a couple of feet. Shorter pieces give you better control when removing the tape.

Tom
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Old 11-17-2018, 07:32 PM   #18
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Re: Backerboard To Drywall Seam


He didn't do the tile or backer he's left having to tape a seam 2" from the tile which is messed up. I almost always bring the tile past the seam, which ends up outside of any possible water if not I'll fibafuse, mud if needed then Redgard just short of where my tile ends.

And who the hell uses mesh tape anymore?

Last edited by avenge; 11-17-2018 at 07:34 PM.
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Old 11-17-2018, 08:16 PM   #19
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Re: Backerboard To Drywall Seam


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Originally Posted by tjbnwi View Post
Yes, and sticky as——well.....

Good luck getting it off something you don’t want it on.

That’s why you tape off the deck completely. Leave yourself courtesy tabs to pull the tape off. Don’t run a piece of tape more than a couple of feet. Shorter pieces give you better control when removing the tape.

Tom
Is it preservable? As in using today and cutting out a niche tomorrow and the tube still useable?
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Old 11-17-2018, 10:23 PM   #20
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Re: Backerboard To Drywall Seam


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Is it preservable? As in using today and cutting out a niche tomorrow and the tube still useable?
Yes, I tape the nozzle or put a new one on the tube that has not been cut cut open. I've used tubes that have been open for 6 months or or more.

Tom

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