What is a Window Sash?

What is a Window Sash?

There may be no part more important when it comes to your windows’ health than the window sash. But what is a window sash, and what makes it so important? Get the information you need in this guide to make sure your windows are in optimal condition.

Anatomy of a Window

Most windows are made of three basic parts: the glazing (or glass), the frame surrounds the perimeter of the window and holds the glass in place, and the sash that connects them. Some windows include other design elements, such as grilles, which can be aesthetically pleasing. These parts combined enable you to easily open and close your window while ensuring a tight seal that keeps air and moisture out.

What is a Window Sash, and Why is it Important?

Since the window sash is the point of friction that allows the window to open and close, it often needs more attention than the other components. If your windows are leaking or jammed, the solution is usually a window sash replacement.

Window Sash Parts

Several window sash parts make up this sliding juncture. Some windows include more, but these are the essential elements:

  • The lock and keeper are on top of the window, allowing you to lock the window as needed.
  • Tilt latches are another kind of lock that allows windows to be tilted into place.
  • The meeting rail is the part of the sash that slides along the frame when the window is opened and closed.

Top Window Sash Materials

Window sashes are most commonly made of wood, aluminum, and vinyl, and each option offers unique advantages. If you’re not sure which of these options is best for your home, get in touch with a window specialist to learn more.


Wood windows offer natural beauty that fits in classic and modern interiors perfectly. They’re also customizable with plenty of style, paint, and stain options. However, it’s important to keep in mind that wood windows may be prone to swelling over time, and require regular maintenance, so be sure to consult with a professional first.


Aluminum window sashes are exceptionally durable and a good choice for homeowners looking to invest in lasting quality. While they don’t have the same distinctive look as wood sashes, there are plenty of color and style options to choose from.  The downside to aluminum sashes is that they tend to pit and become discolored over time.


Vinyl window sashes are some of the most recent innovated materials available and great for energy efficiency, durability, and style. They tend to require less maintenance than other material options and made to last for decades.

Diagnosing Window Sash Problems

It’s always a good idea to pay close attention to the health of your window sashes to ensure they are working correctly. To do a quick checkup yourself, slide the window open and close. If it glides smoothly, your window sashes are in working order. If not, or they’re leaking air from outside, you may want to consider a replacement.

Consider a Window Replacement Today

A window replacement doesn’t have to be difficult or expensive, as long as you work with a reputable company that puts quality first. Thompson Creek has years of experience installing quality windows that are affordable and last for years to come.