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Old 09-12-2017, 09:26 AM   #2
Kman
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Join Date: Nov 2006
Location: NW Arkansas, Ozark Mountains
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Welcome to the forum, David.

If we're talking ceramic tile and not natural stone, you can certainly get by with two layers of plywood, the first being a minimum of 5/8" tongue and groove properly installed, and the second being a layer of 1/2" installed over the first.

You can also use 3/4" for the first, and 3/8" for the second, but 3/8" is pretty difficult to work with, so we typically recommend 1/2".

Either of those setups will give you the strength you need for ceramic/porcelain tile over joists that are 24" on center.
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