I'm in a 100 year old house and I believe the floors are original. They don't seem to be tongue and groove, but just flat boards nailed into the subfloor with finishing nails.
Periodically, the nails start to inch themselves up. We hammer then down but they just come up again. This happens all over the house.
Is there a way to secure them more permanently? Replacing them with different nails? Coating them in some kind of adhesive?