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Unread 10-29-2019, 10:17 PM   #4
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
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Done properly, you have a good shower system there. I can't say for sure what has caused the grout to come up in that area, but it's usually due to movement, like Goldstein said.

It's also possible that the grout just wasn't applied properly and there was an air bubble there. The grout held up for some period of time, then gave way. Who knows?

Considering the alternative, which is usually demolition, at this point I'd probably remove any loose pieces and re-grout. What color to use is anybody's guess, but there are different color charts online and in tile stores, just match it as close as you can.

If I didn't see any signs of leaking, I'd rather grout that one spot every year or two rather than tear it apart, just for that alone. But keep an eye on the ceiling below the shower for the future in case it does leak.
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