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Unread 10-11-2019, 12:55 PM   #4
cx
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Join Date: Jul 2001
Location: Boerne, Texas
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1. Yes. With your 12" joist spacing the single layer 3/4" plywood will exceed any tile substrate manufacturer's requirements.

2. Any AC, BC or CC plywood you find with T&G edges and an exposure rating of EXT or Exposure 1 will suffice. You must orient the plywood with the strength axis perpendicular to the joist structure.

3. With your joist spacing I would be comfortable with a single layer of nominal 3/4" plywood under Ditra. More is always better, and if you're actually considering a natural stone tile the second layer is mandatory.

My opinion; worth price charged.
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