Replacing a bathtub with a new one pictured. It will go into a 3-walled space. Durock and tile will be attached to wall to finish the job.
I've been reading many articles and they mention a ledger board for tub support.
I drew a picture. Is the ledger board supposed to be under the flange side (as pictured in black) or do you nail the flange to the ledger board (which means I'd have to shim all the studs to be flush)?