Well my kitchen is down to the bare walls and floors, getting set to level up a low spot prepping to start the hard wood floor tomorrow morning. Decide to lay out a couple rows of flooring to aid in my visual on levelness. Then at the bottom of the box of flooring is the instructions so I take a look at them and there are the words I did NOT want to see....."DO NOT INSTALL OVER PRESSED WOOD OR FIBERBOARD" OK my sub floors are MDF ie: Fiberboard So what is next? Pull the entire floor up and put down T & G plywood? Put plywood over existing floor? Can I put hardwood over the MDF? Man I knew something would come up but.............DANG! So lay on the ideas, suggestions, Etc.