How To: Install a New Door

Pre-Hung Doors

If you go the pre-hung route, the steps are the same but much simpler. Carefully remove the trim or casing around the door. If you’re hanging a new jamb, you’ll need to remove all framing parts. The pre-hung door comes with all the hardware and hinges attached.

Open the package but do not remove the cross bracing that holds the door jambs in place. Set the complete door in the framed opening and shim the header jamb and side jambs with wooden shims. Make sure that you place shims behind the hinges. Don’t force the shims in or you’ll bow out the jambs. Slide the shims in gently until they stop.

Check to make sure the door is square in the frame and check both jamb sides for plumb. Check the top jamb for level. If everything is square in the frame, you can nail the jambs to the frame using finishing nails. Countersink the nails after they’re driven in and fill the holes with putty. An alternate method is to attach the door frame with trim screws. The head is a bit larger than a trim nail, but is still easily covered with putty once countersunk. An added benefit is that you can take them out if the door frame shifts during installation. Cut off the excess shim material, and install the trim around the door.

Finishing Touch

If you’re planning on painting rather than staining the door, use automotive body filler. Use this two-part product to fill the trim nail or trim screw holes and any other imperfections in the door or jambs. It’s quick, easy to work with, sets up fast, and sands beautifully for an extremely fine finish.