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Unread 04-18-2008, 08:49 AM   #11
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Join Date: Jul 2002
Posts: 30,274
Amy, some of the causes of thinset not sticking to tile are:

1) Not enough thinset applied to floor.

2) Not backbuttering the tile.

3) Dry tile sucking the moisture out of the thinset before the thinset sets.

4) Mold release powder on backs of tile.

5) Thinset skinning over before tile was set.

6) Using a poor grade of un-modified thinset.

My guess would be a combination of 2 and 5. On a big floor, you tend to spread more thinset than you should. From the description of the tiles backs, he didn't backbutter.
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