Sure would appreciate hlep on this one... Am expanding bedroom and had 12x16 foot slab poured. The north-south foundation level (on both sides)slopes about 1 " over the 12 foot span. What is the best technique for correcting this when putting up the walls so that finished top plates are level? Should I shim up the bottom plates with a 2x4 PT ripped shim to go under the standard 2x4 botom plate - OR Adjust vertical stud lentgths (16" OC) over the 12 foot length which would mean the outside corner stud is 1" inch higher that initial wall stud? Thanks for any help.