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Old 08-20-2008, 11:30 AM   #1
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hollow sound after cement dried


Hi - My husband and I just installed ceramic tiles using mortar last night. This morning I was cleaning up and preparing for the grout finish. I went around knocking on the tiles. Most are solid as a rock but a few have a hollow sound in the corner. Is this normal - I have a sneaking suspicion that they will crack a month from now. If this is a horrible mistake can we correct this in any way (maybe push the grout in there more aggresively?) Do I have to remove them?
Any help would be appreciated before we continue with the job.
Thanks,
jeannieB

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Old 08-20-2008, 05:44 PM   #2
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hollow sound after cement dried


What type of adhesive did you use?

If the adhesive has had ample time to dry and you are getting a hollow report when you tap on the tiles - then, the tiles are not bonded to the substrate. They should be removed and reinstalled.

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Old 08-21-2008, 09:15 AM   #3
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hollow sound after cement dried


I'd remove the questionable tiles...look at the bright side...it'll be easier now than after it's grouted. What size tiles?
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