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Old 03-01-2011, 03:56 PM   #9
Houston Remodeler
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Join Date: Oct 2009
Location: Houston Texas
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Shannon,

no 1/4" plywood in anything tile. 1/2" is fine. Yes you screw the plywood down to the first layer of ply, avoiding the joists, after reading this article

The cbu is thinset-ed then screwed into place using cbu screws
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