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I'm going to have to disagree with Boat and say take the time to make sure that hinge side is plumb
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I never said it not to be plumb that way. I said "Don't kill your self plumbing the hinge side Jamb.I can show you 6' levels that disagree"
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And, that is plumb in both directions. That is to say that not only should the hinge jam be plumb in th opening, the walls must be plumb. Otherwise the door will tend to swing open or closed by it self.
I disagree with hkstrud... The wall doesn't have to be plumb as you think at all. If We went with that then all the old homes in my town won't be able to get a new door. Most ALL our old walls are out of Plumb and many on New homes...
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If the wall leans you can usually move the bottom with couple of blows with a your hammer. At this time also check the latch side wall to see if it is plumb. If not try plumbing it by moving the bottom
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If that is done then make sure you take the pictures off the wall. If it's a old home with plaster better get out the Home owners insurance. Also lets not mention the banged wall in time possibly springing back to its wood memory position.. Also the plaster may crack right then or later.
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Your doors will have a split jam
We still have prehungs that aren't split jambs more so then not.
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It may be necessary to shim behind the casing on the interior side to keep the latch side parallel to the hinge side but not usually. Usually the casing will conform to the wall. In worst case you may have to caulk between casing and wall to hide shims.
Be careful shimming a split Jamb If you don't take the stapled casing off. If the shims are going in from one side then you can Twist the jamb and cause a bad installation real quick on what you thought you just had in swing and reveal. That is what causes a door to swing out on its own also.
Let me redefine some things Pythagorean theorem is more important of the frame to door then the door to the opening. Also if you finish nail a shimmed door jamb be prepared for the jamb to get wack out the jamb in being plumb and twisting the frame. The soft standard shims will compress more right when you go to set the nail. In turn the jamb may end up a tad out of plumb or to wide. God bless Passloads/air/battery nailer's. So quick in shooting the nail the compression isn't as prevalent.
Its not necessary to plumb the inside of the strike jamb. No matter what it has to be relative to the door swinging on the hinge side. The strike side has to mimic the hinge Jamb location and is turn the door hanging on it, its own footprint. Telegraphing is what's required in any door installation. Plumb or a tad out of plumb.
I Never needed to level a header or strike side of a prehung door on a wood frame or a KDF metal frame. If the door is there to swing on the set hinge jamb. The door becomes your square. Actually a Square is not needed at all if the hinge jamb is plumbed and set. The only worries is if the floor rises up when the door is opened and the bottom of the door hits the carpet or hardwood floors.