I have a floor that I want to level. It was a covered lanai at one time that has since been enclosed and finished. Unfortunately the prior owner opted not to level the floor. The floor has approx 2" step down, and then a running slope of about 1 1/2" more. The area is 8' x 14 and currently carpeted wall to wall, I believe the surface underneath has been painted at one time. Any suggestions as to tackeling this? I want to eventually lay tile over a nice level surface.