How to Replace a Door Jamb

A loose or broken door jamb is one of the easiest problems to fix so you don’t need to hire a window cleaning for it. In fact, we’ve got some simple, step-by-step DIY tips for you on how to replace a door jamb like a professional handyman!

Take Measurements

Obviously, you want the new door jambs to fit in perfectly with the opening you’ll be installing them into. Plus, if your intention is to replace the old door jamb with a new one that looks similar to the elements in the rest of the room, then you have to take accurate measurements of the doorway, plinth blocks, and ornamental molding before you actually remove the old door jambs.

Cut the Pieces to Size

Get yourself a table saw which has a cutting fence so that you can get straight cuts even on the shortest pieces. You should also get a miter saw for the ornamental pieces. Then, make sure you cut everything according to the correct size.

Install the Jambs

First, check the door framing to ensure that it’s straight enough for you to vertically install the side jamb on the doorways side while it’s still on the floor. Place 2-inch nails inside a nail gun which you’ll use to nail the door to the nailing, all while checking to make sure that it’s straight. Do the same with the jamb on the other side. As any window installation will tell you, the most important thing here is to make sure that everything is straight and level.

Secure the Plinth Blocks

The plinth block is an elementary aspect of traditional architecture and is used as the main block that connects the baseboard and upright casing. Trim the plinth and baseboard pieces after cutting them according to the appropriate width. Then, nail the plinth blocks at the lowermost point of the casing trim sections.

Nail Up the Casing Trim Boards

Attach the external part of the casing trim boards, while making sure that the boards are slimmer than the plinth blocks. Attach them to show 1/4th of the side jamb. Put in the casing trim while ensuring that the nails are placed 12 inches apart. Also, nail a flat piece of decorative trim which measures ¼ inches by 1-1/2 inches below the top casing trim and just over the two vertical casing trim pieces. Then, attach the top casing trim as well, but only after you’ve made sure that the thin decorative pieces and side pieces are secure.

Install Decorative Molding

Start by measuring the spaces between the old decorative molding to make sure that you place parts of the right size in this space. If you notice that your decorative molding needs to be taken in, then cut 45-degree pieces on them using a miter saw. Then, nail all of the decorative molding and fill in any exposed nail holes and joint lines with wood filler that has paintable caulk by using a small putty knife.

Sand, Prime and Paint

Once the wood filler is dry, sand it down and then smear on a coat of high-quality primer. In the end, paint the door jamb to finish. If you need help, don’t hesitate to hire a window repair.