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Unread 03-24-2011, 08:42 PM   #2
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
Welcome, Andy.

Given the measurements you quoted the Deflecto says you are good for ceramic at L/506 if you have Doug Fir or SYP in good condition.

I'm more concerned with the 1/2" plywood. There are ways to install plywood under the existing if cleated and installed properly. Not sure I could adequately describe the method. Would taking up the 1/2" and putting down 3/4" be out of the question? To me it would be less work than trying to fit all the pieces into the joist bays and do so properly.
If that doesn't work, I'll always think it should have.
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