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Unread 04-17-2011, 10:43 AM   #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, Tom!

If your joists are Doug Fir or SYP then the deflecto indicates you are good for a tile installation. You are correct about the 1/2" plywood. It needs to be CC or better Exposure 1 or exterior.

I would secure all the planks to the joists. Screwing them down is a good way to accomplish that.
If that doesn't work, I'll always think it should have.
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