Are you planning to install new windows in your house but do not know what window jambs are?

If so, then we are glad you found us. Standard wooden windows have advanced significantly throughout the past 75 years, notably in innovation and components.

However, no part could ever replace the window jambs to this day, as they are the structural foundation of windows. Getting the right window jamb assures the long life of a window. But what are window jambs exactly?

This blog post features everything you need to know about them. So, keep reading to find out!

What Is A Window Jamb?

The vertical portion that forms the edges of the window frame is named the Window Jamb. It serves as a component of a window's foundational support, and the jambs are positioned within the window frame, covering the corners and the top.

What is the most accurate approach to defining a window jamb for those who still do not understand?

If you had to disassemble it into all its individual elements, the window itself would come first, followed by the jamb along each side of the framework. We hope you understand it clearly (if you had not previously)!

The manufacturer usually installs window jambs, but some people do it themselves to save expenses. To install it:

  1. Take the window measurements.
  2. Trim the jamb according to the alignment.
  3. Secure it to the window opening with nails.
  4. Close the jamb using caulk to maintain optimum insulation and closure.

Types Of Window Jambs

Now, let us have a look at the two types of window jambs:

  1. Head Jamb:The horizontal portion that extends over the top of a window framework is called a head jamb.
  2. Side Jambs:The primary vertical components that make each side of a window frame are called side jambs.

In addition to the description, we added a pictorial representation of a labeled window jamb so that you have absolutely no ambiguity.

Difference Between Window Jambs And Sills

If you tend to confuse window jambs and sills, you are not the only one because this confusion is common.

As seen in the picture above, the vertical portion that holds up each side of the framework is a window jamb, whereas the base is called the window sill. This region of the window supports the glass piece while the window is shut in windows that operate vertically.

The sill also features a track that facilitates the movement of the window. In short, both components play a crucial role in supporting the window.

What Is A Jamb Liner?

Now that you know what window jambs are, this section features what a jamb liner is and its role. A jamb liner is a piece of substance that fits into the sidewalls of the window structure to ensure a secure grip for the pane. Based on the sort of window you wish to install, and the supplier, a jamb liner might be placed over or somewhere in the surrounding frame in many ways.

Jamb liners are also situated to fill in spaces and fractures, and the additional insulation increases the energy efficiency of windows. These get constructed from compact, sturdy, and long-lasting materials like vinyl or aluminum. How cool is that, right?

What Is A Jamb Extension?

Whenever you look for window jambs, it is unlikely to ignore the term jamb extension. Have you heard it before? If not, do not worry because this section contains the answer to your question. Continue reading!

A window jamb extension is an inner element that enables the window framework to accommodate its opening. It may be refitted after the installation of the window or inserted as an extension. Jam extensions are available in different thicknesses, and their insertion depends on the final requirements of the window. They may extend from the head, vertical sides, or the base.

Jamb may be built to meet a specific level of depth to ensure that the window assembly will be flat with the inner wall, resulting in a tight fit and making it simpler to attach the casing. The usual depths for jamb extensions are:

  • 15/16 inches
  • 1 3/8 inches
  • 3 3/8 inches
  • 8 3/8 inches (Possible, subject to the company)

Are you wondering what would happen without jamb extensions? Without them, you would need an expert trim woodworker or drywall laborer to cover the empty gap with hardwood, drywall, or a different substance prior to the trimming. Therefore, getting jamb extensions positioned through the window builder can reduce labor costs on the worksite. Incredible, right?

Jamb Extension Options

Now that you know everything about window jambs, this brings us to the last section of the article: Jamb Extension Options. Jamb extensions come in various designs and dimensions to fit every installation demand. The options are listed below:

  • Kolonial oak jamb extension
  • 3/4 return
  • Wood/Drywall Receptor
  • 3-3/8" or 1-3/8" extruded vinyl
  • 15/16" extruded vinyl
  • PVC wrapped
  • Foam wood
  • Walnut Laminate
  • Stainable pine jamb extension
  • Veneers
  • Primed wood

You see, there are so many options to choose from. Whether bought coated or untreated, wood adds richness to an indoor area and may coordinate with the color of the existing wood trims in the house. As a substitute, PVC-encased jamb extensions integrate vinyl's beneficial features with wood's resilience. But, it all comes down to your choice and house interior, whatever you think goes best with your decor.

Summing Up

In this blog post, we have provided all the information regarding window jambs, their types, jamb liners, extensions, and the various options.

Now, it is up to you to choose what you think is the best for you. It might feel challenging but hey! After reading our post, you have more knowledge than 90% of the buyers, and we believe you will make the right decisions while installing your new window. Good luck!

June 20, 2023 — YanJoanne