Kim said, If you do decide to remove the linoleum and have the plywood
exposed then
injecting penetrating epoxy from above (flows like water for dry rot
applications) into the T&G sections between the joists should help.
I'm not sure that is a good idea, the plywood or OSB needs to be able
to expand and contract. Epoxy could cause the subfloor to crack.
The blocking from underneath would be the best solution.
I think you'll find that if you use longer screws into the joists, this
will eliminate most of the squeaking.
Mr Fixit eh
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