Installing over old finish floor
I am looking to install flooring in our 1928 Bungalow that was built without a subfloor, the finish floor is 3/4 inch, T&G, narrow plank, close grained wood of unknown species (I cannot access the house right now to say exactly what the floor is). The old finish floor is installed as a subfloor in that it was laid before the interior walls were framed and the planks are continuous under the baseboards and walls, the floor is laid perpendicular to the joists.
At some point in the past, carpet was laid down over the floor and the doors were cut at the bottom (poorly, I might add) to accept the height of the pad and the carpet. All carpet is being removed and the old flooring is in rough enough shape (wear, gaps between planks, etc...) that I would like to lay a new floor down. The floors in the house are largely, but not exactly level with very minimal bounce.
Although I know it wouldn't be quite standard, is there any reason that I cannot lay 3/4 solid flooring perpendicular to the old floor (it would be parallel to the joists) using the old narrow plank finish floor as a subfloor. Adding a plywood or other subfloor over the prior finish floor would take up too much height and require adjusting exterior doors and thresholds, and ripping out the old finish floor to lay a proper subfloor is not an option.