Planing ceiling plat and second floor sill.
Sorry if the nomenclature is all wrong. Situation is half way up an 18" wall there is a horizontal line in the surface of the drywall. The line is roughly 4: above the height of the plywood suface of the second floor. I always thought it was due to the bottom of the second floor not beign flush with the top plate of the first floor. As it is so high above the surface of the second floor, I am thinking that can't be the problem.
If it is cause by framing protruding beyound the plane of the rest of the wall, is it best repaired by removing the drywall and planing down the "bump" in the wood or should I let a drywaller work some magic?
Speaking of drywall, my best guess now is the original drywall was hung pretty bad.
I donn't think this is something caused by settlement or earthquakes. If it was it happened 20 years ago and hasn't shifted since. I suspect it was sloppy original construcion. Unfortunately, I only noticed it after the builder filed for bankruptcy.
My thinking is to wait until I am ready to repaint the room and then cut a small inspection window to see what the problem is. If it is something that can be planed, cut some dry wall away, and square the frame. If it was a lousy drywall job, get a good mud guy in. Either way, I will want a professional dry waller. I have done enough patching to know that if I do it the repair won't be that nice. At the same time I may as well have them refloat the patch job I did after some plumbers did a number on the ceiling of the kitchen.