I am completely remodeling a floor on my 3 family house as the 3rd floor has not been touched in 30+ years. I am talking with a contractor and originally asked for the floors to be refinished but he says they are in bad shape. He has suggested to go over the existing hardwood instead or refinishing them.
Iím curious to get some feedback, would it make sense to go over the old floor as he suggests or would it make more sense to rip the old floor up then install the new wood?
I am reluctant to recommend installing anything over anything. While its possible to do so its always best to go back to the original subfloor. Screw down the floor to the joists in 6-8" intervals and every 4" at the seams. This will protect you from vibrations and squeaking in the future. Depending on what's underneath the existing floor you make want to install some 5/8" plywood on top.