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bms42 t1_ixr161s wrote

Did you notice that it's the backer board itself that's sagging, not the tiles? OP is going to have to figure out how to secure that to the joist(s) and IMO any kind of adhesive would be dodgy. I'd want mechanical fasteners involved in that fix personally.

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Rgeneb1 OP t1_ixr4k04 wrote

Not at home to check just now but I don't think so. Looking through the crack it looked to me like the tiles were glued straight onto a board, that looks fine. You can sort of see the glue stretching but still holding to the board and tile. Does that make sense? The plastic coving at the front is helping keep the tiles in place which is maybe why it looks like the board is sagging in the pics. I'll know more when I take the tiles off to clean it and refix on Monday but I really hope you're wrong.

At the moment it's just propped into place with a bunch of empty amazon boxes and I'm not moving those until I have the time to work on it at start of next week.

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Canam82 t1_ixur7yw wrote

Yeah, you're seeing the tile trim. I've seen this before where whoever installed the tile used pl Instead of mortar. I'm guessing heat and moisture slowly stretched the pl out to what you see.

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bms42 t1_ixv5pwo wrote

Ah yeah, you're right. Mastic in a bathroom is bad enough, but on a ceiling? That's crazy.

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