On 2005-04-28, Eric and Megan Swope wrote:

Hi everyone. I am putting a prehund door into the rough opening. I
want to make sure my door is not twisted in the rough opening. When
I say twisted, I mean that one door jamb doesn't stick out further
than the other.

My understanding is that ideally each edge of the jamb should line up
with the finish surface of the adjoining wall. This is so that the
backsides of the door trim will all be in a plane, the plane of the
wall. To line up the edge of the jamb with the finish wall surface,
put a straightedge on the wall perpendicular to the jamb, overhanging
the rough opening just enough so that the jamb can be brought up
against the level.

Often the jamb thickness will not exactly match the finish wall
thickness. If it is less, pick one side to line the jamb up with, and
install an extension jamb to line up the other side. This is just a
piece of 1x material cut to the necessary thickness, usually installed
with a small reveal, just as door trim is installed with a reveal. If
the jamb is wider than the wall, then it is best to cut it down or
procure a different jamb.

Not sure what the best strategy is when the wall is not plumb, since
the door jamb should be installed plumb, which implies the edge of the
jamb can't be aligned with the finish wall for the whole length of the
jamb. Perhaps taper the jamb or use a tapered extension jamb?

Hope this helps and answers your question, I'm not sure if I
understood it exactly.

Yours, Wayne