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Old 10-01-2018, 10:38 PM   #1
BrittanyATX
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Can 3/8" thick mud cap bullnose be installed next to 1/4" thick field tile? How?

I am planning to redo my master bathroom in a historically appropriate style with the old style mud cap bullnose trim. If the trim pieces are 3/8" depth, how hard is it, or is it even possible/worth it to use them if all the main field tile is 1/4" depth?

If it is possible, how could this be done?
Would it matter if the install was over a mud wall or kerdi wall?
Lastly, can this type of mud capped wall even be done over kerdi because it sticks out so far, and if it can how's it done?
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Old 10-01-2018, 10:50 PM   #2
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You can build out the field tile area with cement board to accommodate the use of mud caps.
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Old 10-01-2018, 11:07 PM   #3
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Ok, thanks that makes sense.

What if the installation is via a mud wall, how would the different thickness in tiles work for that?

I'm still deciding between diy schluter or hire out full mud bathroom.
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Old 10-02-2018, 09:51 AM   #4
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You're dealing with an eight of an inch difference, so I'm not sure how cbu would help.

One thing you might try is to get an 1/8", V-notched trowel and comb that all over the field area EXCEPT for where the mudcap would go. Let that cure say overnight. That would then provide a little pedestal or stilt, essentially making the field tile end up the same height as the mudcap. You could do it with a LFT mortar while setting all of the tile that allows a thicker bed, but that will make trying to keep everything in plane tougher. It will make combing out the fresh layer when setting the tile tougher, but possible, I think.
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Old 10-02-2018, 11:14 AM   #5
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Currently available mud caps that I've dealt with are actually designed for 1/2" return to wall. Typically used when installing 1/2" cement board on top of drywall or other 1/2" material. I assume the size is designed for a grout joint between wall and cap.
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Old 10-02-2018, 01:02 PM   #6
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Sorry, I was thinking bullnose. I'm guessing, the cap portion projects 3/8"? If so, building the wall up first is the right choice...and, cbu should work fine.
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Old 10-02-2018, 06:31 PM   #7
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Regular mud bullnose, A-4200 has a 3/8 inside radius.
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Old 10-02-2018, 06:57 PM   #8
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What Peter and Davy said.
Quote:
Originally Posted by BrittanyATX
What if the installation is via a mud wall, how would the different thickness in tiles work for that?
The mud cap tiles were specifically made to cover up a mud bed that's thicker than the adjoining substrate. It would work great if your mud guy is really a mud guy.
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Old 10-02-2018, 07:31 PM   #9
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We always used 1/2” wonder board or Durock, which left 1/8” or so against the wall which we caulked. I believe Hardi is a little thinner but we never use Hardi.
I like the look of the mud caps.
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Old 10-02-2018, 09:53 PM   #10
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So it seems like this maybe isn't a big deal the difference in tile thickness? My mud caps are vintage stock from the 50's A-4200 at 3/8" tile thickness, but my AM-4200, AN-4200 and main field tile are all at 1/4" thick.

If I'm understanding right, this should be no issue for a competent mud guy?
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Old 10-03-2018, 12:22 AM   #11
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So, the 3/8" is both the lip's height and the tile's thickness?
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Old 10-03-2018, 01:01 PM   #12
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Those are made to go together.
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Old 10-03-2018, 04:44 PM   #13
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@jadnashua

I went ahead and drew a picture to better explain my tiles.
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Old 10-03-2018, 06:49 PM   #14
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I've never seen mud BN that's 3/8 thick. It's usually about the same thickness as the field tiles. Are your field tiles as old as the BN?
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Old 10-03-2018, 07:37 PM   #15
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No. Field tiles are modern dal-tile, mud tiles are NOS that were made in Japan in 1960's.

The Mosaic Tile Co. which was a major tile manufacturer back then made 3/8" thick tile.
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