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Old 06-22-2010, 07:31 AM   #1
frustratedhomeowner
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cracked grout can it be expired grout causing this? please help

We had 1,050 square feet of tile installed and grouted now 4-5 weeks later 4 areas have started to get cracked grout.

I was given two-three bags of grout out of the storage area of the local supply store and he brought me several additional bags the next day. I think the grout from his storage area was old grout because I have two bags left over and one of the coded numbers on the bag start with 10 for 2010 and the other one starts with 05 so the manufacture date of the grout must have been 2005 and it has been sitting in his shed for 5 years unclimate controlled.

He is telling me there is no expiration date on grout and it does not get old.

can i please have some input could this be bad grout or is it something else? He says my house must be shifting My house was built in 99 so I think the shifting must be over.
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Old 06-22-2010, 08:33 AM   #2
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Entirely possible that shifting could be the culprit. Equally possible that a faulty installation is to blame. Can you give us any particulars about type of floor, support and how the tile was installed?

Finally, YES....grout that is old can certainly cause the problem. Never touch any that is over a year old...and even THAT old can be problematic if not stored properly!

"No expiration date?" He doesn't know what he's talking about.
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Old 06-22-2010, 10:04 AM   #3
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Quote:
Originally Posted by Laz
Can you give us any particulars about type of floor, support and how the tile was installed?
I'm thinking also you might be looking for an out with the grout but it's probably
more along the lines of a weak sub floor or installation error.
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Old 06-22-2010, 11:21 AM   #4
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Welcome, Dustin.

What them others said.

Too old grout would likely have exhibited other symptoms much earlier on. Cracking 4 - 5 weeks later is more likely some other problem.

But do give us the brand name and model of the grout and the full date code you find on the old bags.

My opinion; worth price charged.
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Old 06-22-2010, 02:21 PM   #5
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more specifics

The subfloor is 3/4 inch plywood and the installer put down mud and then 1/2 in cement board and the mud then tile. The installer told me the cracks were not near the seams of the cement board in one area because he could remeber where the seam was in that are the other area he was unsure.

I am not looking for an out with the grout I am looking for an answer to the cracks and then figure out how to fix it. The supply store is not taking any blame at all and I highly doubt they will do anything for me even if it is bad grout. I do not want to pay to have the entire floor regrouted and then have it crack again.

The installer came back and spend about three hours replacing the cracks that formed over the last couple weeks. I just want to be done with the project at this point and not deal with the floor even if that means to pay to re-grout the floor if that is the problem.

I am at work when I get home I will log on and post the code and brand of the grout.

Thanks for your input and ideas they will all help me figure out how to fix this

Dustin
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Old 06-22-2010, 02:30 PM   #6
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Check the joist structure when you get home, too. Joist type, size, spacing, and longest unsupported span.

Is the grout cracking random, or are the cracks mostly in one direction?

Any cracking in any tiles? Any tiles appear loose or sound hollow when you bounce a golf ball or hard screw driver handle or similar on'em?

Did your installer fill and tape the joints in the CBU before tiling?

Have you been a truly good person since the tiles were installed?
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Old 06-22-2010, 02:31 PM   #7
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When the installer put down the 1/2" cement board, do you recall him covering the CBU joints with mesh tape? He might have also done it at the time the tile was installed.

Can you tell us if the cracks you saw were running parallel with the joists? Also be good to know if there were any parallel cracks running three feet or five feet apart. Those can be indicative of CBU joints that were not taped. It's one of the most common causes of cracked grout.

Also tell us the brand name of the thinset and grout if you can.
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Old 06-22-2010, 02:48 PM   #8
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What the others said.

Some photos of the install might help too. Maybe even some photos before & during the install if you have any.
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