Help: 24" rectified porcelain hollow voids

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Old 09-04-09, 10:47 AM
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Help: 24" rectified porcelain hollow voids

I am having 24" rectified porcelain laid "like" marble", i.e. laid in mud, and abutted with minimal grout lines. The installation to date appears level with very minimal lippage, but i have tapped the tiles and most tiles have a hollow-sound area or areas, especially around edges and corners. Do i have a problem, and do the "hollow sound" tiles need to be taken up and replaced.
 
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Old 09-04-09, 11:05 AM
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You should have 100% coverage on the bottom of the tiles. Were the tiles back buttered with thinset as well? Hollow sounds are not good because that means voids. I would mark all the hollow sounding areas with painters tape and have this fixed.
 
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Old 09-05-09, 12:13 PM
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How long were the tiles down after you tapped on them. There could be a hollow problem and that would need to be addressed but it also can take a few days for the full coverage thinset to cure out and the hollow sound to go away, especially on a tile that size which would use a lot of thinset under it.
 
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