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Unread 05-21-2008, 06:53 AM   #3
ceramictec
Tampa Florida Tile Contractor
 
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Join Date: Oct 2007
Location: Tampa, Florida
Posts: 26,409
Hi cdmariscal,

welcome to the forum.

as Dave said, we all here will agree its best to rip up the old tile and start from a clean slab.

your taking a chance of how well the tile was done, how well it was cleaned, how good of a bond the thinset got and how good the thinset is, and raising the new tile up at doorways and the edge.

porcelain tile is very hard and scuffing it will be a task. there are good quality thinset's out there that you can set tile over tile like a flex type of mortar that is highly modified, but there is now way you can use a regular thinset if you do attempt to tile over tile.

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