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Unread 04-17-2019, 07:32 PM   #1
krader
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Cracked grout in tile curb

So, I've been stewing over this very question because I have a house that is about 3 years old and the grout on the shower curb is all cracked both inside and outside the shower.

I was leaning toward caulk so it can flex. Everywhere I can find says where the plains change direction use caulk, but I can't find anything about an inverted corner. All the online instructions I can find talk about inside corners, but they say where expansion joints are. These seem like expansion joints.

My tiler used grout, but as you can see, it didn't work or I have other internal problems.

I'd like to hear more on this, and please give good reasons instead of just saying, "because that is how it is done."

Attached are pictures!

To note, I cleaned out that vertical crack of grout on the outside of the shower pan where on the corner already, so that is why you don't see any grout at all there. My plan is to grind out the grout every where, then either use caulk or re-grout.
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Last edited by krader; 04-17-2019 at 07:38 PM. Reason: Clarification
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Unread 04-17-2019, 08:16 PM   #2
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Welcome, Jeff.

I've separated your post from the other visitor's thread to avoid confusion on both.

We need to know how your shower was constructed to get much further, but my first impression is that you have a problem other than your grout.

The tile industry standards call for a flexible sealant in all joints where the backing material changes plane and generally between ceramic tile and anything not ceramic tile.

Some of your cracking appears to be at the edge of your non-tile edging material and that is generally a manufacturer's prerogative as far as whether grout or a flexible sealant is to be used.

The cracking I see on your curb looks more like a problem with the rough curb expanding or moving, which is why we need to know very specifically how that portion of the shower was constructed and waterproofed.

My opinion; worth price charged.
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Unread 04-17-2019, 10:26 PM   #3
smifwal
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I would be willing to bet that your curb is holding water and is swelling and that is why your grout cracked. But as CX said more information would be great to better narrow down the cause
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Unread 04-18-2019, 01:37 AM   #4
Jim Farrell Tiler
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i bet the curb or as we call it "hob" is timber, its getting wet and swelling/moving
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Unread 04-18-2019, 10:43 AM   #5
ZZZK
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I predict cement board screwed into the curb.
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Unread 04-18-2019, 04:48 PM   #6
evan1968
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I predict cement board screwed through the liner into the 2"x4"s they made the curb out of.
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Unread 04-18-2019, 06:12 PM   #7
Davy
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Jeff, to clear things up, there's nothing wrong with making the curb out of 2x4's as long as they aren't treated. Treated wood tends to warp and twist as they dry out. Regardless of what the curb is made of, if you have a leak, you've got problems. But if wood is used and the waterproofing is leaking at the curb, it swells and causes the problems you are seeing.
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Unread 04-18-2019, 10:09 PM   #8
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When I see this I think the liner has already failed to the point the shower water has gotten to the curb and made it swell.

Set one hand on a tile then wrap your other hand knuckles on the same tile to test for loose tiles. How many are loose?

Have you done a flood test?
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Unread 04-20-2019, 02:21 PM   #9
Jim Farrell Tiler
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i never use wood for the curb, do you have this product in the usa....xhttps://www.marmox.co.nz/product/ready-to-tile-over-shower-bases/
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