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Unread 04-17-2011, 09:22 PM   #4
Brian in San Diego
AC Specialist -- Schluterville Graduate
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Join Date: Oct 2005
Location: La Quinta, CA and Usk, WA
Posts: 10,791
Originally Posted by Tom
I think I also read that I don't glue/adhere the 1/2" plywood to the subfloor only screw it down to the joists correct?
No, that isn't what you want to do, Tom. You want to fasten the plywood to the subfloor NOT the joists.

Usually lumber is marked in some place on dimensional lumber. Even if your joists fall under the unknown species in good condition you still pass muster with 2x10s, 16" OC and 12.5' span. Wouldn't worry as long as you are setting ceramic tile.
If that doesn't work, I'll always think it should have.
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