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Installing Split-Jamb Interior Doors

Project Overview

Installing Split-Jamb Interior Doors

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 mitred 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.

2 Steps

  1. Separate the Two Halves of the Jamb
  2. Cut Shims
Separate the Two Halves of the Jamb

Step 1

Separate the Two Halves of the Jamb

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 Shims

Step 2

Cut Shims

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 centre of the stop. Nail the casing to the wall with 4d finish nails.

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Project Details

Skill Level: Intermediate

Time: 3 hours

Before you start, read this »

Due to differing conditions, tools, and individual skills, The Home Depot® assumes no responsibility for any damages, injuries suffered, or losses incurred as a result of attempting to replicate any of the home improvement ideas portrayed in this website Before beginning any home improvement project, review it thoroughly to ensure you or your contractor can finish the project and if any doubts or questions remain, consult local experts or authorities. Because codes and regulations vary greatly, you always should check with authorities to ensure that your project complies with all applicable local codes and regulations. Always read and observe all of the safety precautions provided by any tool or equipment manufacturer, and follow all accepted safety procedures.


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