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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.
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