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How to Replace and Repair Broken Door Jambs: Complete Guide

When talking about in-house peripherals, doors are used the most. As a result, doors are prone to the most damage as well.

Between the different sections of the doors, the door jamb is the most vulnerable. Oftentimes, it just cracks and eventually breaks. In such cases, it needs repair and replacement. 

So, how do I replace and repair broken door jambs?

Firstly, take out the hardware and weather strips of the door. Secondly, pry off the door jamb and fill the empty space with a fitting wood piece. Thirdly, take the door jamb and door stop measurements and replicate them. Finally, mark out the door striker and deadlock, and attach them.

This is not all the information regarding the repairing of door jams. Head into the article and read it till the end for more information!

Get started now.

How to Fix Broken Door Jambs?

So you are in a situation where your door jamb is broken. Along with that, maybe your strike plates and plates attached to the deadbolt are damaged too. It has a bunch of cracks and stretching marks in all places, including the upper area.

You may be really frustrated in this situation. Since the doors are an essential part of a home, it’s prone to damage. 

On top of that, if the door is damaged, your comfort and security are compromised. This happens too with rubbing and sagging doors

I have got a piece of good news for you. I am here to help you overcome this door situation! Below, I have provided step-by-step guidelines to repair and replace door jambs! 

Try to follow the steps with precision and maintain the sequence. Let’s go!

Step 1: Take out Weather Strippings around the Door

The very first thing you need to do is strip the weather stripping around the door. It is a foam substance that is attached around the door frame in strips. Some people also use this to reduce incoming and outgoing sounds through the door.

If the weather strippings are around the door, it’ll be tough to remove the trims and frame. We will be doing that in the future steps, so stay tuned. 

Just pull the weather strips from one end to the other. There should be 3 strips on a door. The left strip, the right strip, and the upper strip. Simply pulling on the weather strip tabs will do.

If your door doesn’t contain any weather strips, you’re clear about this step! Proceed to the next one.

Step 2: Take off Hardware

For this step, we will be taking off all the hardware. Take off all the deadbolt hardware first. You can use an automated drill or a screwdriver to take them off. After the deadbolt hardware, take off the strike plate hardware.

Make sure that whenever you are taking hardware off, you are setting them aside. We will be needing these in the future steps, so do not throw them away. 

On another note, if you’re planning to buy new hardware, you can throw them out. You should also save all the locks and latches of the door. 

Step 3: Pry off the Door Jamb

Now it’s time to pry off the wooden framing/ door jamb of the door. Specifically the security sensors. You can very easily pry off the old security sensors because it is cracked.

To pry it off you can use a screwdriver. Use the tip of the screwdriver to bend the wooden piece. Alternatively, you can use a pry bar and a hammer to take off the wooden pieces. 

If you don’t want to take out the door casing, just knock off one side. After taking off the door jamb, it might be stuck with a nail. it depends on the door jamb you have.

If the door jamb is stuck with a nail use a handheld hacksaw to cut it. It will take time to cut the door jamb using a handheld hacksaw. 

So in this case, what you can do is, you can use an automated hacksaw.

These automated hacksaws will save you a lot of time along with making the process easier. They are also known as reciprocating saws.

If you are looking for a reciprocating saw, here are some top-tier suggestions from my end-

Product 1
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By using these reciprocating saws, you can easily cut through any wood material.  They last very long too! 

You should always be careful while using any type of saw. If you can wear protective gloves while working with saws. 

After you’re done prying off all the wooden strips,  vacuum the place. Clean out all the voids Inside of your door jamb.

Step 4: Fill the Void with a Piece of Wood

Typically, after prying off security sensors, the voids are filled with wood. If yours are not, you can fill it up with wood. 

First, measure the height and width of the door jamb. Accordingly, cut a solid piece of ½-inch wood. You can use a table saw to cut the wood. Again take safety precautions. 

After cutting the wood, place it in so that it can act as a filler. Screw in the piece of wood. For this step, make sure you drill pilot holes first.  It should be done before you nail in the screws. Without pilot holes, the wooden piece is prone to breaking again.

Use general-purpose wood screws. Since the wood piece is 0.5 inches thick,  you may use 2.5-inch screws. Use multiple screws throughout the filler. The screws should go in the top middle and bottom. 

If you’re combining two wood pieces, you will need 6 screws in that case. It does not need to look good but make sure that it is nice and flush. It should complement the drywall and the outside sidings. 

Step 5: Replicate the Door Jamb

You can use the old door jamb to measure the door jamb. Use a measuring tape for this task. After that, buy another wooden piece that is bigger than the door jamb.

Make sure the wooden piece has a notch at the bottom. If it does not have a notch, you can use a circular saw and cut it. Use a speed square to mark out the jamb measurements. Then you can use a miter saw to cut out the excess part of the wood. 

Keep test fitting the piece of the door jamb. When it fits perfectly, just put it in and tap it with a hammer to secure it. After the jamb is in place, drill the pilot holes again. 

Afterward, screw the 2.5-inch nails as well. 

Again, put the nails in at the top, the bottom, and the middle. You can use as many screws as you want. More screws and nails will result in a better foundation for the door jamb. 

Step 6: Replicate the Door Stop

From the bottom of the door jamb, and measure to the top section of it. The length you get will be the length of the door stop. The general door stop has a width of half an inch.

Similar to the jamb, use the miter saw to cut off the excess part. After that, you have to make a weather strip channel. 

For the channel, you have to have ½ inches going in and ¾ inches down. You have to use a table saw for this.

Set the table saw to ½ inch deep. Then, you can curve out the weather trip channel. It is advised to use a scrap piece as practice work before doing the door stop piece. Keep test fitting the weather strip channel.

After the wooden piece is ready, you can brad nail it from the sides. Place about 6 brad nails on the door stop. Put the extra nails because it’s the last defense for the door swinging to the other side. 

Finally, put the weather strips back on.

If you have some spare time and wooden pieces, you can make some door trim casings. That way, later, you can install door trim casings by yourself!

Step 7: Cut out Door Striker and Deadbolt Hole

For this step, first ensure the weather strips are one. Not having the weather strips on can actually bring out inaccurate measurements for the knob hole. A pro tip would be to use the mechanical pencil for doing the measurements of the knob hole.

Put the lid at the maximum position and it can trace out where the doorknob will hit. Also, it can provide accurate measurements of the deadlock holes. 

Mark over the door knob striker.

Mark all the holes and outlines for precision; cause you can’t afford to mess up. Then, flip over your door strike, and trace the section where it’s gonna be hitting.

After all the measurements, now it is time to cut out the sections. Take a 5 8 spade bit and attach it with an impact drill. Then start drilling a shallow hole.

Don’t make it too deep since that is not for the deadbolt one. After drilling, take a ½-inch chisel and chisel the section out. 

Remember to take your time while hitting the chisel with the hammer. Go through the linings made with the mechanical pencil; precisely.

Finally, keep driving, fitting the door strike and see if it fits. Hold the door strike against the marked section. It should be flush with the door stop. If it isn’t flush, you can keep chiseling till it fits. 

Alternatively, you can use an oscillating tool to cut out the section.

To the same steps with the deadbolt. Mark out the deadbolt section and use the oscillating tool to fit it into place. For the deadbolt hole, make it deep. You can also use a chisel throughout the entire process if you want.

Step 8: Attach the Door Strike and Deadbolt

This is the final step. You have to now attach the door strike to the door stop. To do that, first, make 1 pilot hole through the door strike holes. 

Then, use the hardware screws given with the door strike and screw them in. 

Do the same with the deadbolt. Make 2 pilot holes and use the hardware screws to attach the deadbolt. That will complete the entire door jamb repair. 

This process is somewhat similar to fixing jamb gaps after new floor installation.


What is a jamb kit?

The timber lining kit attached to the framework of the pocket door is the jamb kit. This kit helps cover the edges of a door in a closed position. This way, you cannot see the top section of the door. Although the timber lining kit does not increase efficiency, it does help with the visuals. It gives a pro finish.

What kind of wood is used for door jambs?

3 types of wood are mostly used for door jambs; fir, hemlock, and pinewood. These are the most common woods because they are cheap and provide a natural texture. Using other wood like oak can provide a stain-grade jamp. On top of that, oaks and other woods are hard to get and expensive for jambs.

What can I use to fill rotted wood?

To fill rotted wood, you can use the resin epoxy to fill it up. Of course, it is quite necessary to catch the rotting wood in time. Rotted wood can rot all the wood around it. Sealing the rotted wood with epoxy will stop this process. On top of that, it can provide a clean and professional look as well!

The Final Words

This is the final stretch of this article. I hope that you now know how to replace and repair broken door jambs

If you think this work is too professional for your hands, don’t worry. You can always take help from a carpenter regarding these works!

All the best!