Question for the group. When we bought our house it had a detached 600 sq ft shop. The shop had mdf flooring which had multiple places of rot due to leaks. I had 3/4 chip board placed over it before I moved all of my shop equipment into it. I would like to lay a hardwood floor over that so it looks a little better and has tremendous durability. This is a shop that is not climate controlled unless I am out there. it has a wood stove for heat and 2 window units for cooling.

is there anything I need to do before laying the new floor? underlayment? vapor barrier? etc?