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Unread 01-12-2022, 12:05 PM   #2
cx
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Join Date: Jul 2001
Location: Boerne, Texas
Posts: 96,107
Welcome, Barry.

First you need to evaluate your joist structure to determine if it is suitable for a natural stone installation without some improvement. Hint: It's not.

Then you must install a minimum of nominal half-inch exterior glue plywood with no face of grade lower than C on top of your existing subfloor. Then your tile substrate of choice.

My opinion; worth price charged.
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