already has 2x6 boards on the joists, if that's what underlayment is. They are in good shape.
tougher time
answers. Google
of the
have 3/4"
to smooth
subfloor is
you can bond
Well, thanks....it's been a month since I posted the question. Since then I learned some of the terms, already installed the cement board - like you say, directly to the subfloor. (I'm not laying tile, by the way).
unless your
deflect under
normal advice
Too late -- the floor's already fixed, but they were tongue-in-groove 2x6's. From what I gather, it's std 1961 tract home construction. Again, no tile invovled.
them in