How to Install a Door Jamb Leg


The jamb of a door is made up of the three pieces of wood that form the inside of the frame. The vertical sections of the jamb are called the legs. Sometimes one leg of a door jamb will be damaged--usually the one with the lockplate--and need to be replaced, while the rest of it is in mint condition. You can easily remove the single leg; installing a new one is even easier.

Things You'll Need

  • Replacement wooden door jamb leg
  • Saw
  • Hammer
  • Finishing nails
  • Wood shims
  • Moulding
  • Lock plate or hinges, depending on the leg
  • Measure the height of the doorframe: the distances from the floor to both the bottom of the header jamb and the upper edge of it.

  • Cut the new jamb leg to the longer of the two measurements. Subtract the difference between the two, and angle the upper edge downward by this distance, so that it will smoothly interconnect with the angled edge of the header jamb.

  • Slide the jamb into place and secure it with finishing nails. Shim it as necessary. Reattach the moulding on both sides of the door.

  • Screw the lockplate or hinges, depending on which leg you're installing, into place. Add a few extra nails around this point for added strength, but make sure that they are not all along the same grain of the wood.

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