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Unread 01-03-2006, 02:01 PM   #3
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Join Date: Jul 2002
Posts: 30,274
At 14'-6", your joists are a bit overspanned for tile, but I don't think that will be a problem, so long as the joists are in good condition and are not chopped up for the plumbing. Other structure in your house will help stiffen them.

3/4" T&G plywood is more than adequate subfloor for ceramic tile, no matter what underlayment you choose. Again, the plywood has to be in good condition, not rotted, etc. Of course, more subfloor is better, so if you can afford another 3/8", then add 3/8" plywood. You can use Ditra as your underlayment to save height.
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