First off, our old house is 82 years young, has survived at least one house fire (who knows when), is post and beam construction with standard 2x4 and lath/plaster walls on the main floor. Several beams in the basement were replaced years ago. Possibly after the fire occurred. Let's just say there's been some "settling" over the years!
So is it any surprise that as I was determining the length to cut my jambs, I discovered the wall and floor have sagged 5/8" just in the 36 1/4" rough opening for the door.
Adding to our dillema is a very uneven cleft slate floor. A couple high spots dictate raising the door nearly 1/4" in the rough opening to clear those high spots. Luckily, the hinge side of door is the high side of the floor.
Any suggestions? Or do we just have to live with a roughly 3/4" gap on the strike side of door when it is closed?