The origins of the sash window are believed to be in England in the 1670′s. This style of window and method of operation has retained its popularity since that era, both in restoration of historic homes and in new construction.

A sash refers to a panel of glass (or today it could be plastic) that is set as one or more panes of material into a frame which slides up and down, or side to side, to open a room to the outside or shield its interior from the weather.

Those who understand the principles of a sash window will see that many of Hooke’s other studies may have contributed to his invention of a moving panel of glass that could slide up or down or sideways to open a room to the outside air. Encasing one or more sashes in a frame equipped with a weight and pulley system to keep the sash opened to a set height resulted in the attractive and convenient sash window.

Over time, sash windows made of wood will loosen in their frames, as continual opening and shutting wears the jambs and tracks, and the wood itself expands and contracts with the changing seasonal temperatures and shows the effects of weather. Older windows may rattle in the wind and let air leak in or out around the joints. They also may refuse to open as paint builds up in the seams, or refuse to stay pushed up when the sash cords get brittle and break with age.

New houses have this style of window as well, although the materials may be more modern. Either soft or hard wood is still seen in many houses, since it gives a traditional look and is a good insulator. Modern commercial buildings and cement block houses may have more informal vinyl or metal windows, often using aluminum which does not rot or corrode. Another durable material is fiberglass, which has the advantage of expanding and contracting the same as the glass panes. It is stronger than vinyl or aluminum, neither rots or corrodes, may be painted, and has a higher insulation rating than metal or plastic.

The sash window has not been changed much over the years, although single glazing has often given way to double and even triple glazing for energy efficiency. Glazing is a term for a transparent panel in a wall; single means one thickness, while double and triple glazing simply fist more than one panel in a frame, with air spaces in between.

The origins of the sash window are fun to trace, as are the changes, not so much in design as in materials. Today’s windows may be made of soft or hard wood, metals such as aluminum and vinyl, and even fiberglass.

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