An important part of traditional windows, the window sash is the moving section of the window. Depending on the design of the window proper, there may be one or more sashes that allow the space to be opened or closed according to the preferences of the occupant. With some window designs, the window is permanently fixed in place and cannot be opened at will.
The components that make up the standard window sash are very basic. This type of window is composed of a simple frame that is built to allow easy insertion into window casements. Within the frame, glass is inserted and sealed into place. The glass may be composed of a series of small panes that are connected with an interlocking framework and attached to the larger frame of the sash. For standard windows, the panes are often clear, although some designs call for tinted or stained glass components.
The sashes may be attached to the casement by a set of runners that help to hold them in place. The runners also include the tracks that allow the window to be moved up and down at will. At one time, the runner mechanism was operated with a series of ropes that were built into the casement. Later models used simply metal tracks to achieve the same purpose.
At one time, the window sash was constructed of wood and glass. Over time, metal frames were created for use in public buildings as well as new home construction. Considered to be durable and more energy efficient, the metal sashes were often constructed of lightweight aluminum. Their installation is very simple, and they are still a popular option for windows that are included on outdoor porch and patio doors.
While the metal sash continues to enjoy a great deal of popularity, many new homes are being constructed with the traditional wood sash. Providing a touch of tradition, the modern day wood sashes and casement options may be simple in design or include detailing that provides a customized touch.