If you want to make sure that the surface of the jamb sides and
head are all in a single plane, the easiest way is to put a proud
finish nail in the four corners. Tie off a dry line to create the
diagonals of the jamb (make an x going from top right to bottom
left and top left to bottom right. When the strings touch at the
center where they cross, the jamb is in plane.

For those who do not know, simply nailing off the jamb to run with
the drywall on each side of the opening may not give you a jamb
that is in plane. If it is not, the door will gap at the top or
bottom of the strike side jamb. The condition can often be
disguised with creative installation of door stop often resulting
in a door that needs to be pushed a little hard to latch as you
warp the door into location.

You probably won't see many carpenters do it this way, but you may
see them shim and tack a jamb, hang the door, and modify the plane
of the jamb with a heavy hammer to accomplish the same thing that
the strings tell only using the door itself to determine plane.

(top posted for your convenience)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Keep the whole world singing . . . .
DanG (remove the sevens)




"Eric and Megan Swope" wrote in message
news:baece.9338$WX.4786@trndny01...
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. Is there a special
tool to check for this. I will draw a picture below, using J
for the door jambs and l for the level. However I don't think
this is how to check this. Any help is greatly appreciated.
Thanks.


J J
J J
JLLLLJ
J J
J J