Split-jamb, pre-hung interior doors feature jambs that are
literally split in half lengthwise. The trim casing is
already attached to each edge of the jamb. That means you
don't have to fumble around trying to make perfectly
matched mitered corners – it's already done for you.
With a split-jamb door, each half of the jamb is installed separately,
beginning with the side that holds the hinges. Once the
first half is completely installed, the second half slides
neatly into place using a nifty tongue-and-groove joint.
First,
separate the two halves of the jamb. Set the side with the
door stop in the opening and tack through the casing about
12 inches from the top. Block and shim the jamb at the
hinge locations, and above the jamb. Plumb and square the
unit. Nail through the jamb (not the stop), and into the
door frame with 6d finish nails.
Cut the
shims flush with the first half of the jamb. Inset the
other half of the split-jamb into the first half and
gently push it into place until the casing reaches the
wall. Use 6d finish nails to nail through both halves of
the jamb right in the center of the stop. Nail the casing
to the wall with 4d finish nails.
First,
separate the two halves of the jamb. Set the side with the
door stop in the opening and tack through the casing about
12 inches from the top. Block and shim the jamb at the
hinge locations, and above the jamb. Plumb and square the
unit. Nail through the jamb (not the stop), and into the
door frame with 6d finish nails.
Cut the
shims flush with the first half of the jamb. Inset the
other half of the split-jamb into the first half and
gently push it into place until the casing reaches the
wall. Use 6d finish nails to nail through both halves of
the jamb right in the center of the stop. Nail the casing
to the wall with 4d finish nails.