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Unread 03-24-2011, 09:01 PM   #3
builder, anti-builder, rebuilder -- Retired Moderator
Join Date: Mar 2009
Location: oahu
Posts: 13,164
1/2 plywood would be very unusual for subfloor. Double check that at a few places. It may be 5/8 which measures around 9/16 when bone dry, maybe a hair more.

With only 10-1/2 or less between joists, i don't think you could beef it up properly from below... if needed. If it really is 1/2 plywood over the joists, remove it and replace with 5/8 minimum tongue & groove or blocked edges. 3/4 would be better, like BSD said.

edit: having a transition at adjacent floors where elevations are different is not a problem, as long as they are handled properly. We can help you with that if needed.

"the road to hell is paved with osb, mastic, pre-mixed latex 'grout' or 'thinset', "
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