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Unread 03-03-2021, 02:23 PM   #10
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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Quote:
Originally Posted by Zoe
What we had was this: 1" tongue and groove on 16 inch joist spacing.
Tongue and grove what, Zoe? Plywood, OSB, sawn boards, other?

There is no "exterior grade plywood." What you want is an exterior glue plywood with no face of grade lower than C.

There is no 1 1/8th" subfloor requirement for natural stone tile installation. There are specific combinations or the mandatory two layer subflooring.

If you have an adequate subfloor, you can certainly use the Ditra. You could also use a CBU if you want.

Do you plan to improve your joist deflection or just tile what you've got?

My opinion; worth price charged.
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