pulled rugs off found old flooring. very old home 1920?. old flooring running perpendicular to joists. want to install 3/4" oak flooring. can it b installed over old flooring and can it run perpendicular to old flooring? will run same way joists run.
I will bet that old floor will look good when sanded and resealed. cost less than installing a second layer of finish floor.
the issue with installing floor parallel to joists is that houses shrug and sag a little bit with age and sharp changes in weather. doing wood flooring parallel to the joists risks things like separation gaps, buckles, and other failures.
I'd get some floor sanding companies in to verify this is finish flooring you have already, not just a subfloor of planks. likely they will write you a bid that is smaller than installing another floor of, frankly, inferior newer growth wood.
sig: if this is a new economy, how come they still want my old-fashioned money?
Not a good idea to install a nail-down T&G floor on top of another T&G floor - no matter which direction. Either remove the old floor and install new, or add a 3/8" to 1/2" layer of plywood and then the new flooring.
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