Weather Shield Blog

Home > News > WS Blog > March 2016 > What Is a Window Sash?

What Is a Window Sash?

3/10/2016 4:16:12 PM

As you shop for window replacements, you’ve probably come across various terms you don’t quite understand. By learning the names of different window components, you can be a more educated shopper, comparing features and qualities that allow some windows to perform better than others.

Today’s term we're defining for you is “window sash.” This is essentially the name for a window pane and all the components surrounding it. In double-hung windows, both the upper and lower sashes move for versatile ventilation. In older single-hung windows, only the lower sash opens. While sliding windows have two sashes, usually only one is operable while the other remains stationary. Still, both panes of glass are referred to as a sash.

Each window sash is comprised of multiple parts you might hear thrown around as you shop for replacement windows. These might include:

  • Glazing: The window glazing refers to how many sheets or panes of glass the window has. While double-glazed windows are the most common, single- and triple-glazed windows are also available.
  • Rails and stiles: The material surrounding the window panes can be made of wood, vinyl, fiberglass, aluminum or other materials. Horizontal components are known as rails and vertical pieces are stiles. Together, these pieces are called the frame.
  • Muntins: Not to be confused with mullions, which divide entire sashes, muntins divide individual panes of glass within a single sash. Traditionally, muntins were necessary because it was too difficult and expensive to manufacture large window panes. Today, some windows are divided into sections with false muntins inserted between the glass panes. These are purely aesthetic and serve no structural purpose. Modern windows with false muntins – or grille-between-glass – are more efficient than old windows with true wood muntins joining multiple panes of glass together.
  • Gaskets: Modern windows are sealed into their framework with gaskets made of rubber or thermoplastic vulcanizates (TPVs). These allow for better energy efficient, keep double- and triple-pane windows at a set distance apart, and prevent panes from rattling around in their frame.
  • Gas: Some double- and triple-pane windows are filled with harmless, colorless gas such as argon or krypton to increase the window’s insulating ability. A tight seal ensures the gas remains in place and does its job for years to come.
If you’re seriously considering replacing your windows soon, look to Weather Shield for more information. We can help you decide what window styles are best for your home depending on your lifestyle and aesthetic preferences. With so many customizable options from Weather Shield, you can choose just what your window sashes look like and what components they include.

To learn more about window products from Weather Shield, feel free to contact us directly or find a Weather Shield dealer near you.

Find A Dealer
Dealer Login
CAD Details

Download the latest Weather Shield CAD Symbols and 3D models for your next project.

Learn More