Use a measuring tape to record the distance from the drywall to the door edge to determine the length.
Drywall extends past door jamb.
Step 2 create the extended door jamb.
What he ended up doing is to extend the jam in order to split the difference i e at maximum the jam was 1 8 past the dw at minimum 1 8 behind.
A buddy of mine does trim work for a living.
As an amazon associate i make.
Doorjambs are designed to fit standard width walls made out of 2 by 4 or 2 by 6 lumber plus a layer of 1 2 inch drywall on each side of the wall.
Determine the length of the side jambs and the horizontal jambs.
Not everything is perfect.
The door casing is nailed to the jamb and to the wall and covers the space between the doorjamb and the wall.
Tools used on this job.
In the place we re modeled he did much of our trim work and like the op we had many jams that were not parallel nor flush with the walls.
I have a homeowner who has window and exterior door jambs that extend past the drywall by about 1 1 2 inches.
The ripped out the plaster and put in drywall and now all of the jambs protrude past the drywall.
These jambs span from one side of the wall to the other.
The first thing you need to do is to determine how long the door jamb extension needs to be.
Watch a simple way to build and install your own wood trim that also solves a common problem with drywall that extends too far past door and window jambs.
Window jambs extend beyond drywall.