Timber Sash Windows

Timber Sash Windows: Some Historical Background for UK Homeowners

Timber sash windows have a rich and varied history in the UK and elsewhere. From ultra-modern homes to traditional and historic houses, timber sliding sash windows are a popular and cost effective option to consider when looking for replacement windows. Here's some information about wooden sash windows that you may find interesting and instructional.

What is a Sash Window?

Sash windows are wood windows in which 2 sashes slide within a frame to open and close. A sash is the wooden frame that holds the pane of glass in place. Older sash windows are counterbalanced by weights hung on ropes known as sashcords. In the beginning, the weights were made from lead. In more modern sliding sash windows, the weights are made from cast iron. The term "double hung" refers to a sash window in which both panes are weighted and therefore operable. Recesses in the frame known as sash boxes hold the cords and weights and the meeting rail is the point where the bottom of the top sash meets the top of the bottom sash. A sliding lock is often installed on the meeting rail to prevent either the top or bottom sash from being opened. The sashes are "checked" or recessed into vertical grooves in the frame.

It's thought that the sash window came to the UK in the 17th century from France. Common in Victorian and Georgian houses, a classic sash window usually has six small panes in each sash separated by narrow moldings. This is known as a "six-over-six" window. Early wood sash windows were not checked and did not extend beyond the wall as modern windows do. This flush fit is especially common in brick walls. The hallmark of modern windows is the architrave or molding that surrounds the window. This molding usually extends an inch or two forward beyond the wall and into the room. In a Yorkshire timber sash window, the sashes slide horizontally and do not require weights.

Traditional wood sash windows are usually made of softwood like pine or spruce. Single glazing is normally the rule in these windows, but it's possible to replace single glass panes with more modern double glazed panes that have an insulating air space. While attractive, wooden windows are prone to problems like rattling and rot and require regular painting.

timber sash windows have remained a popular option for both historic and modern homes in the UK. Their ease of use and pleasant appearance makes them a perennial favorite with homeowners.

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