I'm going to be installing solid wood flooring on my second floor .. 711 sqft to be exact. My house was built in 1921 and after ripping up the rugs, I have found a layer of plastic tile on top of a layer of masonite on top of the original floor boards. The tile and masonite measure about 1/4" in height. The tile is completely intact across all the rooms.
My question is:
1. Do I need to rip all the tile and masonite up or just screw some 1/2" or 3/4" plywood right on top of the tile/masonite?
2. Will this make any difference besides adding height to my subfloor?
Thanks so much in advance. I attached some pics of the floor to give everyone an idea of what the tile looks like.