I recently bought my first home (1925) and pulled out all the carpets
to find 3/8" hardwood floors underneath. My floorers refused to sand
the downstairs floors because the boards were coming apart as they were
taking the staples and nails out form the carpet. They think it has
already been sanded and that there isn't enough to sand on the lip now.
I have had another floorer recommend that I put engineered hardwood
down over the orginal. Is there an advantage to this?