Installing pre-hung doors is the most popular method of hanging new doors
or replacing old ones. All you have to do is install the unit into a rough
opening. When ordering a pre-hung door, you will have the choice of a
right- or left-hand swing, as well as having the manufacturer drill the
holes in the door for the locksets. If the unit arrives with a brace to
keep the door and frame aligned, leave the brace on until the door unit
is plumbed, shimmed, and secured into place.
Tools and Supplies needed:
Basic tool kit and items on this page.
Hanging an Interior Pre-Hung Door
A. Trim any excess drywall around the doorway to make sure the new
door will hang plumb. B. Check that the floor is level, marking for
any shims that are needed under the level.
C. Measure and mark against the jamb where any shims
are needed. D. Cut the door to the appropriate length.
E. Remove the plug that comes on the pre-hung door, as well as the
temporary trim on the bottom of the door. F. Tack one nail on a shim
in the doorway to get started.
G. Place the door inside the opening. Position the door so it's plumb, and the door is able to swing open. H. Secure the jamb with nails along
its length. I. Use a straight edge to check the door opening, ensuring
that it has room to open and close.
J. with the door closed, place a shim by the bottom hinge to accommodate
any adjustments from the previous step. K. Check the top gap above
the door, and check the door again to make sure it's level.
L. Check the center shim and the gap to make sure the door is plumb.
Nail the door in place, from the jambs through the shims. M. Use a
nail set to set the nails beneath the wood, creating a smooth finish.
Fill the holes with spackle.
N. Check the door to make sure it opens and shuts properly.
A. Place a level on the vertical surface to check that the door is
plumb. B. If you need to adjust the door, try using a sledgehammer
with a very gentle tap.