Is it okay to install the 3/4 in. prefinished wood flooring (such as is manufactured by Bruce or Canwood or Century) over a vinyl floor? The sub floor squeaks but the contractor said he will shoot nails through the vinyl to stop the squeaks. He says he has done this before with no problems. The man on the local radio home repair show said he'd be concerned about differences in expansion but really wasn't sure of the answer. Also what about using the old molding, just freshing up the finish on it? Does that make the job look cheap in some way?