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Unread 07-18-2021, 07:58 PM   #1
netrate
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Corner Grout small holes - how to fix?

The shower I put in a few years ago has some little holes the size of a grain of rice in the corners. How should I go about fixing this? I don't know how much water is getting through, but I want to hopefully fix it before it causes issues.
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Unread 07-18-2021, 08:23 PM   #2
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First off, industry guidelines are that any changes of plane or materials that are tiled should have a movement accommodation joint...IOW, that shouldn't be grouted, as grout is rigid. Now, some people grout it and don't have issues, but many do.

Second, a shower should not be damaged by water, even prior to the tile being installed. So, a gap in the grout should not be reason for a fault.

But, if you want to fix it, by trying to fill in the hole, go for it. If the hole isn't deep enough, grout tends to not stick, though. And, the color may not match new stuff versus old stuff.
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Unread 07-18-2021, 08:40 PM   #3
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After re-examing it, the hole is in the caulking where the vertical and horizontal walls meet. Knowing that, should I just try to add some caulking to the hole?
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Unread 07-18-2021, 08:44 PM   #4
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Are the corners grouted or caulked, David?

With what, in either case?
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Unread 07-18-2021, 08:48 PM   #5
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If it's caulked, you may need to cut the caulk out, clean up the joint, and recaulk. The hole likely has some crud in it, and applying some on top may not work well.
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Unread 07-18-2021, 10:36 PM   #6
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Either way, you won't be fixing anything by caulking over it because the caulking wasn't your waterproofing to begin with. You have moisture behind the tiles already. The caulking is just there instead of grout so it doesn't crack from movement over time.
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Unread 07-19-2021, 07:38 AM   #7
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They are a bit squishy, so yes they are caulked.
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Unread 07-21-2021, 07:30 PM   #8
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So should I just leave it as such?
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Unread 07-25-2021, 07:35 AM   #9
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As long as those holes aren't weeping any water you could try to fill the holes with caulk, David, but no guarantee of success. The current caulk should be silicone, and new silicone tends not to stick to old, cured silicone.
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