What is a Sash?

A sash typically refers to a framework or assembly that holds glass panes in place within a window or door. It is a key component of traditional windows, particularly those with multiple panes of glass divided by muntins or bars.

In the context of windows, a sash is composed of vertical and horizontal members that surround and secure the glass panes. The vertical members are called stiles, while the horizontal members are called rails. The sash may also include muntins or grids that divide the glass into smaller sections.

The sash is designed to be movable, allowing for the opening and closing of the window. It can be either single-hung or double-hung, depending on whether one or both sashes can be operated. In a single-hung window, typically only the bottom sash is movable, while in a double-hung window, both the top and bottom sashes can be opened and closed.