I have a home that was built in the 1950's that has no floor insulation in a vented crawl space. Flooring is all hardwood, with tile in the kitchen and bathroom installed over the hardwood. As was common at the time, the hardwood floor was installed directly onto the floor joists, meaning no subfloor. 15lb felt paper was layed onto the floor joists before the flooring was installed. The felt paper is what you see when you look up in the crawl space.
I would like to insulate between the floors with bat insulation rolls rather than encapsulate the crawl space, so I have a couple of questions that need to be answered. 1) Can I even consider insulating between the floor joists given that I have no subfloor 2) If I can insulate this way, do I need to remove the felt paper to ensure contact between the paper side of the insulation and the flooring above? 3) would removing the felt paper create a moisture issue for the flooring above?