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Discussion Starter · #1 ·
I'm redoing an attic and the daughter-in-law wants to put down a floating, interlocking wood floor. House is 60 years old with 3/4"x4" tongue and groove pine floor. Holiday's over and now back to work. I'm putting down 1/4" underlayment plywood over the tongue and groove and after looking at a home improvement book from a nat'l big box store, it says to space the underlayment 1/4" from walls and to gap the sheets the same 1/4". and then to fill and sand the sheet gaps with floor patching compound. The attic will be heated and AC'd when necessary. Is this spacing and particularly filling/sanding with compound necessary for my application? I'd really rather not do it if it is not necessary. Thanks for any input.
 
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