Quote:
Originally Posted by batman911
The hollow sound means there is an open void between the bottom of the tile and the cement or slab. This could cause the tile to crack if something heavy is dropped on the tile or placed on top of it. I believe most tiles become more brittle with age. Not something that will happen today but years from now it could be a problem.
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How much of a problem it is depends on the size of the hollow and the thickness of the tile. As the slabs age they shrink a little. I was told they continue to shrink a tiny bit over several years. We had tiles in our Atlanta house crack after two years. If I were you I would make them reset them or at least get extra tiles so if they crack in the future you have ones that match if they do crack. IMHO