engineered hardwood over regular plywood
I am in the process of preparing my subfloor for the installation of engineered hardwood. My home was built in the 1940's and has an existing subfloor that consists of 3/4" t&g boards installed on 16" OC floor joists. The subfloor is in good condition but I would like to stiffen and level it by covering it with a layer of plywood. The lumber store has high quality underlayment available but I feel that regular plywood would be adequate in my case. Do I need the sanded/clear underlayment for engineered hardwood or would regular 1/2" ply be ok (glued and screwed)?
Thanks a bunch,