How To Install A Prehung Interior Door With Casing Attached

How to Install a Prehung Interior Door With Casing Attached

Replacing an interior door with a prehung unit is a straightforward task that can be completed in a few hours with the right tools and materials. Prehung doors come with the door, frame, and casing already assembled, which makes installation much easier than installing each component separately. Here's a step-by-step guide on how to install a prehung interior door with casing attached:

Materials You'll Need:

Prehung interior door
Level
Tape measure
Pencil
Screwdriver
Hammer
Construction adhesive
Shims

Step 1: Remove the Old Door

Start by removing the old door. Use a screwdriver to remove the hinges and then lift the door out of the frame. If the door is stuck, you can use a pry bar to gently loosen it.

Step 2: Prepare the Doorway

Once the old door is removed, you need to prepare the doorway for the new door. Inspect the frame for any damage or rot and repair it as necessary. Use a level to make sure the frame is square and plumb.

Step 3: Position the Prehung Door

With the doorway prepared, you can now position the prehung door. Place the door in the doorway and center it. Make sure the door is level and plumb using the level. If necessary, use shims to level the door.

Step 4: Secure the Door Frame

Once the door is positioned correctly, you need to secure the door frame. Use screws to attach the frame to the studs in the wall. Make sure the screws are driven in securely, but do not overtighten them.

Step 5: Install the Casing

The next step is to install the casing. The casing is the trim that goes around the door frame. Start by attaching the side casing pieces. Use a nail gun or hammer and nails to secure the casing. Then, attach the top and bottom casing pieces.

Step 6: Apply Construction Adhesive

To ensure a secure installation, apply a bead of construction adhesive to the back of the casing. This will help to hold the casing in place and prevent it from coming loose over time.

Step 7: Finish the Installation

Once the construction adhesive is applied, you can finish the installation by touching up any nail holes or gaps with wood filler. You can also paint or stain the door and casing to match the rest of your decor.

Tips:

Make sure the prehung door is the correct size for your doorway before you purchase it.
Use a level to ensure that the door is installed level and plumb.
Don't overtighten the screws when attaching the door frame and casing.
Apply construction adhesive to the back of the casing for a more secure installation.
Touch up any nail holes or gaps with wood filler before painting or staining the door and casing.

By following these steps, you can easily install a prehung interior door with casing attached. With a little planning and preparation, you can have a beautiful new door in your home in no time.