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					Originally Posted by  nightfighter
					 
				 
				What was the tile laid on? Subfloor, luan, or hardibacker? 
			
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 I think subfloor....but I'm not positive. A couple tiles that were cracked, I lifted them up to find almost NO ADHESIVE. Under the tile was like sand? I had to shop vac it out in order to put a little glue on the tile to tack it back down. Was the sand an adhesive that just deteriorated?
That give you any clues? I'm clueless!!