Replacing Plywood Panel in Subfloor
I'm down to the subfloor in several rooms in the home. In one room, there's one subfloor board (4'x8') that's rotten, and fortunately, doesn't run under any walls. I plan on taking it up, pulling out any remaining nails, laying down Loctite's PL subfloor glue, and then screwing a new board in its place.
Question: what's the spacing for the screws going into each joist -- every 6", every 8", every 12"?
Also, in another room, I want to get under the subfloor and don't want to damage the ceiling on the other side (way too much demolition). Can I do the same thing, except rather than putting down new plywood, simply re-lay down the old-but-good plywood?