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old man 08-23-2009 08:37 PM

underlayment on subfloor
I'm building a new house. When I put down the first layer of 3/4" T&G can I place a 1/2" cement backer board over the entire floor to get a total 1 1/8" subfloor before framing the walls? I plan to install tile throughout the house with the exception of the bed rooms which will be solid hardwood. Radiant heat will be installed below subfloor.

R&D Tile 08-24-2009 02:20 PM

3/4" is the minimum, I would frame the walls and everything first, then if possible, add 1/2" plywood over the 3/4" then Ditra.

That 1 1/8" makes no sense to me.

And, if you plan on stone anywhere, another set of rules apply.:)

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