Step 7: Attach the split jamb

Tom Silva attaching the split jamb of a prehung door
Photo: David Carmack
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Starting at the bottom, gently push the edge of the split jamb into the groove in the main jamb. Tap the two jambs together using both hands.

Nail the casing to the wall on both sides of each miter, and about every 18 inches along the casing.

To hold the two jambs together, drive 8d finish nails through the stop and into the trimmers: one nail at each hinge location, one through the shims near the top and the bottom of the latch jamb, and one each just above and below the striker. Do NOT nail into the head jamb.

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    Tools List

    • hammer
      Hammer or nail gun,
      to attach casing and jambs to rough opening
    • four-foot level
      4-foot level,
      for checking plumb or level
    • drill
      Drill/driver,
      for fastening hinges
    • 16-foot tape measure
      Tape measure
    • chisel
      3/4-inch chisel,
      for fine-tuning mortises
    • Phillips screwdriver
      Phillips-head screwdriver,
      for mounting lockset
    • utility knife
      Utility knife (for trimming shims
    • plumb bob
      Retractable plumb bob,
      for plumbing jamb

    Shopping List

    1. PREHUNG DOOR WITH SPLIT JAMS

    2. SHIMS

    for adjusting and supporting jambs



    3. STRIKE PLATE

    to protect jamb from latch bolt



    4. LOCKSET

    to hold door closed



    5. 4D FINISH NAILS

    to tack shims in place



    6. 8D FINISH NAILS

    to nail through casing