Please tell me if I can do this......
I have an attached car port that is in great shape, but the slab is 16 inches below the house floor. In order to bring the new floor up "close to" level with the existing house floor, I would like to lay 2x12s up on end on top of the slab as the floor joists (I'll run the HVAC/Plumbing/Electrical through these), then nail on the sub floor, then build the 3 remaining walls and stand them up to become the new outside walls.
Is this the right way to do this? Any advise will be greatly appreciated.