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Old 06-29-2018, 07:34 AM   #1
owenpga
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hairline crack in grout

Installed new tiles over new backerboard and redguard back in feb.
i noticed a small hairline crack in the grout between tiles.. whats the best way to fix this? I know if grout is to wet this can cause cracking, but i'm pretty sure this is not the case. thought about creating a little groove where the grout is cracked and filling with grout color caulk which i used a tub base and wall joints. Or, can i just remove existing grout and refill. I've read that that won't work due to bonding properties of cured grout and new grout?
Any suggestions would be great. Thank you







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Old 06-29-2018, 08:49 AM   #2
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Owen,

Where are these cracks? In the middle of the walls? Where walls meet? Where wall meets the floor?
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Old 06-29-2018, 10:45 PM   #3
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Hi, Owen.

Cementitious grout doesn’t crack when it’s too wet. Something else is going on. Do you have a picture to share?

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Old 07-05-2018, 05:04 AM   #4
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Owen,



Where are these cracks? In the middle of the walls? Where walls meet? Where wall meets the floor?
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Old 07-05-2018, 06:17 AM   #5
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Owen,

That may be shrinkage. What grout did you use?

In any event, remove the grout in those joints and re-grout. This time mix the grout a little stiffer. When cleaning, try to use as little water in the sponge as you can.
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Old 07-05-2018, 08:09 AM   #6
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thanks for your response. i’ve read on more than one post it’s not recommended to regrout unless your redoing all tiles as the grout has a tendency to crack where cured grout meets fresh grout. Thoughts?


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Old 07-05-2018, 08:53 AM   #7
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What grout did you use?
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Old 07-05-2018, 11:09 AM   #8
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What grout did you use?
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Old 07-05-2018, 12:46 PM   #9
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It looks like a movement crack to me. Shrinkage doesn't follow a stress plane.
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Old 07-05-2018, 02:03 PM   #10
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If grout is mixed soupier than by design, when it cures, it will shrink some, and that's more of an issue with unsanded grout verses sanded. After curing, things are pretty inert.

Movement is probably the more common reason grout cracks. Is that crack for chance along a cbu seam? Did you tape the seams before tiling?
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Old 07-05-2018, 03:12 PM   #11
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If the grout was over watered when mixed or sponged, it can crack. Movement normally causes cracking. Do look for movement.

If just these crack, and don't return after repair, then you don't have movement. If more crack, then you have movement.
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Old 07-05-2018, 03:41 PM   #12
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It's very possible it moved once, cracked the grout and may never move enough to cause problems again. In that case the repaired grout wouldn't crack again. I think if it was shrinkage, there would be more cracks than what you have. I would replace the grout and keep an eye on it. If it moves again, it'll crack the new grout and many times the tiles too. Or, leave it as is a while longer and see if more cracks appear.
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Old 07-07-2018, 04:39 AM   #13
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It's very possible it moved once, cracked the grout and may never move enough to cause problems again. In that case the repaired grout wouldn't crack again. I think if it was shrinkage, there would be more cracks than what you have. I would replace the grout and keep an eye on it. If it moves again, it'll crack the new grout and many times the tiles too. Or, leave it as is a while longer and see if more cracks appear.


can i remove the cracked grout only and regrout? would filling with the same color poly blend sanded caulk be an option? i used caulk for vertical seams in corners and were tile meets tub. colors are identical. thanks


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Old 07-07-2018, 06:15 AM   #14
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If grout is mixed soupier than by design, when it cures, it will shrink some, and that's more of an issue with unsanded grout verses sanded. After curing, things are pretty inert.



Movement is probably the more common reason grout cracks. Is that crack for chance along a cbu seam? Did you tape the seams before tiling?


checked the photos from project and these tiles were not on seam. thank you


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Old 07-07-2018, 10:03 AM   #15
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Yes, you can replace it with new grout. That's what I would do. Cut the old grout deep enough for the new grout to grab hold, usually 2/3's of the depth.
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