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Unread 10-24-2012, 09:32 PM   #8
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Cliff, I'm not sure I could get any useful info out of your spreadsheet even if I could read the numbers, but I can tell you that for the tiles you intend to use the actual industry standard for flatness is no deviation from intended plane of more than 1/8th" in any 10 feet nor more than 1/16th" in any 2 feet.

Those large (long edge) format tiles want a very flat substrate.

If you're not within those parameters, I think Andrew's recommendation might be your best bet.

How flat are you tiles?

My opinion; worth price charged.
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