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Unread 08-11-2018, 02:06 PM   #61
cx
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You don't wanna fill that opening with thinset mortar.

Below is a picture of the only really correct way to install a bead of flexible sealant. You cannot properly do that in your situation, but you wanna get as close as you can.

With a backer rod in there you should be able to get the visible joint very close to the size of the current opening and I think you'll find that once finished it will be quite acceptable aesthetically. It'll probably never be technically correct.

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My opinion; worth price charged.
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Unread 08-11-2018, 02:52 PM   #62
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Im assuming grout is not in the same category as thinset mortar.

My thought was not closing the entire opening with grout, but just fill the void on the edge of the tile, giving the caulk something more to "bite" to and not having as much sealant on the face of the tile. I guess Im overthinking it

Do you think white latisil would be able to mask the light gray backer rod?

By the diagram, I technically only need the caulk to be 1/16th thick. Seems awefully thin.

Interesting fact about it being 4 times the estimated movement. Having rebuilt this bathroom, the corners are sistered 2x4s with blocking in the corners, all screwed together, well seasoned and acclimated lumber, hardieboard, mesh, thinset, crack membrane. Very little movement. One wall is an exterior wall in Vermont, so there's that factor.
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Unread 08-11-2018, 03:06 PM   #63
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Vertical Corners

I know according to TCNA guidelines all vertical corners are to be caulked.

Im just curious is there any situation that could warrant grouting corners?
You hear about that old house that had grouted corners and no cracks. Everyone Ive ever seen thats grouted has cracked.
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Unread 08-11-2018, 04:01 PM   #64
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Quote:
Originally Posted by Adam
Im assuming grout is not in the same category as thinset mortar.
In your application it would be the same.

Adam, you can do whatever suits you in your shower. Best we can do is tell you what the tile industry and product manufacturers recommend and where the smart money is betting.

Some tile installers would simply grout that joint.

My opinion; worth price charged.
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Unread 08-12-2018, 01:04 PM   #65
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CX,

I learn by asking questions. I thank you for your opinion and advice.
I still plan to caulk that joint.
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Unread 08-12-2018, 04:00 PM   #66
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Adam, mud walls is one situation where you can get by with grouted corners. My shower is 23 years old with mud walls. I've had some foundation issues all over my house and yet my corners are still in tact and have never been touched up. Any other method I would caulk the corners.
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