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Unread 01-17-2019, 01:21 PM   #13
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Join Date: Jul 2005
Location: Fairfax, Va
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For your purposes, Paul, and because you're using ceramic and not stone, I'd say it doesn't much matter. Use whatever you can find that is dry.

To me, though, what does matter is finding boards that are not cupped if you plan to use adhesive between the two. If some are cupped, then match them with any of the existing joists that might also be cupped.

Have you decided yet what fasteners you're going to use?
If I recall correctly my memory is excellent, but my ability to access it is intermittent.
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