> What is the door jamb and how to reinforce security

What is the door jamb and how to reinforce security

Most people have the false belief that, only the door and the lock keep their homes safe. The reality is that the security of a home depends on multiple elements working together, for provide the ideal protection environment.

The entrance of a home not only includes a door and a lock; also the lintel, the sill, the hinges, the jamb and finally, the jamb. Possibly, the latter is the least known element of all and believe it or not, keeps your home as safe as the door itself.

If you want to know what a jamb is and how it reinforces the security of your home, continue reading. In this article we will tell you everything you need to know about door jambs, so that you protect your property like an expert. Let’s not wait any longer and let’s get started!

What is a door jamb?

Also known as “flaps”, The jambs are two vertically placed hollow pieces that support the lintel or arch, located below them. In other words, they are the ornamental accessories that cover the junction between the arch of the door and the wall.

The jambs fulfill a double function; since it protects the joints from potential external violations and allows to have a more visually polished image of the entrance of the house.

Although they are generally installed on doors, jambs can also complement window frames. In these, it provides protection against leverage; as well as a safeguard against leaks caused by water.

How many types of jambs are there?

In general, all the jamb models fulfill the same functions; even if depending on the style of the door or the exterior of the property, you can choose one or the other to harmonize with the decoration. Here are the types of jambs that we can currently find on the market:

Molded jambs

It is the most decorative model and therefore the most used by consumers. These trim are etched into composite or wood and give the doors a rustic yet attractive finish.

Usually, the union between the horizontal and vertical jambs is carried out, making a cut at a 45º angle so that they fit together perfectly, without losing the style.

Smooth jambs

They have a minimalist design and are especially used in homes with modern finishes. Contrary to
molded jambs, these do not need the 45º cut in the joints; since they lack a pattern to follow. However, some carpenters still do it, to add a little touch of style to a simple jamb.


Most of the jambs that we can find in the market are made of solid wood; which are obtained from a single piece of noble wood. Also, we can find models made of plywood such as MDF or pine wood fiber; which can have lacquered coverage, natural wood or laminated metal.

Sizes and thicknesses

To select the perfect jamb, we must take into account the place in the home it will occupy; since an entrance door is not the same as that of a room. Once we are clear about its function, we can decide:

  • Entrance door jamb: 9cm thick.
  • Jamb for interior doors: 7cm thick.

In both models, it is possible to play with a difference between 10 and 13mm. Additionally, their thickness usually comprises 1/2 inch, that is, about 1.27cm.

Front door: How to strengthen security

In many homes, we may find that the lock screws are too short to properly secure the receptacle bolt to the wall. This situation can easily lead to the door being the victim of techniques such as extraction or breakage. Although it is hard to believe, it does not matter if we have a high security lock and a solid wood door installed, if we do not have one jamb that protects the whole set.

Despite this, it is possible to improve the security of our home by installing door jambs. Here’s how:

Step 1: Using a flat bar, pry up your door frame or cut away from the side jamb found on the knob. Now, mark and cut out a rectangle in the plasterboard, which is next to the doorknob.

Step 2: Make a 1/2 “mark above the jamb latch plate and repeat, but this time below the knob strike plate. With the help of a ruler, extend the lines horizontally 3.81cm backwards. Now, draw a line joining the ends to create a rectangle. This should measure 3.81cm wide and 20.32cm high. Cut it out and save the piece.

Step 3: Remove any securing that may be between the jamb and the rivet, using a hammer and chisel. This will be the area in front of the drywall that we just cut.

Now, proceed to cut the cutters or nails that you can find in the area using a zipper. This way you will get a 1.27cm wide slot between the rivet and the jamb; which will be aligned with the rectangle that we cut in the drywall.

Step 4: Mark and cut out a piece of pine that is 8.89cm x 20.32cm and 1.27cm thick. Once you have it, slide it between the groove and hold it so that it falls to the end of the jamb with the help of the chisel. Now, drive two nails into the top and bottom of the slot; going through the jamb and plywood at the rivet to fix it in place.

With the help of the chisel cut the rivet material, the edge of the jamb and the edge of the plywood to 0.31cm. These will be right in front of the cuts made in the drywall.

Step 5: At a hardware store, buy a 7.61cm x 20.31cm repair plate made of 0.31cm thick steel that has pre-drilled nail holes. If you can’t find the pre-drilled sheet, you can do this yourself, using a drill and metal bit.

Once done, place the plate where you made the cut in the plaster. Nail the sheet to the rivet, plywood edge and jamb edge; fixing it the best you can.

Step 6: Put back the piece of plaster that you had previously set aside; position it correctly, then fill in the cuts with painters putty. Give it a smooth finish, using a finger dampened in water or with the help of a spatula.

Step 7: Now, put the bolts back to 3/4 ”in the bolt plates and the striker. Then, with the help of a drill, drive the 3 ”screws through the jamb and the 1.27cm plywood.

Step 8: To finish, place the finish nails in their original position and drive them into the edge of the jamb. Fill in the previous nail holes with painters’ putty or wood putty, and if necessary, apply some paint of a similar color.

And voila! successfully reinforced the entrance of your home. With your new custom jamb, reinforced door and security lock; your entrance is almost impenetrable. So now you can rest, travel or go to work; knowing that your home is 100% safe.

How to Reinforce and Burglar Proof Your Entry Door

How to Reinforce and Burglar Proof Your Entry Door

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