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Unread 04-28-2020, 08:48 AM   #1
Rman
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Caulk or Grout for mitered outside corners

I just completed setting tile for a tub surround that has mitered outside corners on the niche and on the columns on either side of the tub. I am using Mapei ultracolor Plus FA grout, and Mapesil T caulk that is supposed to match the color of the grout. I plan to use the caulk at the inside corners of the tub surround wall, and I am wondering if it is better to caulk or grout the mitered outside corners.
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Unread 04-28-2020, 10:37 AM   #2
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The "rule book" states flexible sealant in that corner, but I wouldn't. My only caveat would be that substrate corner was reinforced around said corner.
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Unread 04-28-2020, 11:47 AM   #3
Rman
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Thanks Peter,
The corner is reinforced with heavy duty backer board tape, set in with setting mortar, and covered by Mapei Aquadefense with a cloth strip embedded over the corner. I was thinking that grout would better protect the corner, and that I could use some sandpaper on it to smooth it out a little, but I had also read that caulk should be used at changes in plane.
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Unread 04-28-2020, 12:28 PM   #4
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When framing that corner with studs, Ron, did you mechanically fasten all the studs together?
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Unread 04-28-2020, 12:32 PM   #5
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You can try grouting it if you want. Worst case scenario, if it doesn't hold up, you'd have to remove the grout and caulk it.

I've found that outside corners seem to be the worst for movement, but that doesn't mean yours won't hold up. A lot goes back to how well you built it and secured the corner studs together. I think you did all you could do with the substrate.
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Unread 04-29-2020, 07:09 AM   #6
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Thanks Dan and Kevin,
The framing is very well secured. (corners are glued, clamped, straightened on a jointer and screwed to the rest of the wall framing) There is also blocking between all the wall studs, and a layer of 3/4" plywood well fastened with screws to the face of the framing.
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Unread 04-29-2020, 08:46 AM   #7
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Quote:
Originally Posted by Ron
The framing is very well secured. (corners are glued, clamped, straightened on a jointer and screwed to the rest of the wall framing) There is also blocking between all the wall studs, and a layer of 3/4" plywood well fastened with screws to the face of the framing.
The OCD is strong with this one it is.
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Unread 04-29-2020, 10:16 AM   #8
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Quote:
Originally Posted by Rman View Post
Thanks Dan and Kevin,
The framing is very well secured. (corners are glued, clamped, straightened on a jointer and screwed to the rest of the wall framing) There is also blocking between all the wall studs, and a layer of 3/4" plywood well fastened with screws to the face of the framing.
That's all?
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