Whether you jst level the floor or fix the foundation, will be based on if the house has settled or was built that way. It may have been an outside porch originally that was closed in and made into an interior room.
As Neal stated it depend on which way your joist are running. You want to keep you shims on top of existing joists
If they run with the slope, rip 2" x's from 0" to whatever amount you want to take the slope out at the other end.
If the joist run the other way, just keep ripping them smaller until you get to 0"
Last edited by CharlieO; 04-05-2011 at 08:18 AM.