Sash windows (also known as ‘hung’ sash-windows) have been around for about 400 years and remain the most popular window configuration to date. The name is derived from the fact that these windows contain at least one moving ‘sash’ in their design. The sash is the name given to the part that holds the glass panes (also called ‘lights’) in place.
Some hung windows contain only one movable panal (sash) but most will have two. These panels most commonly open from top to bottom (vertically) but can also be made to operate in a sideways fashion (horizontally). The glass used in these units has traditionally been single-paned but recently double-pane and even triple-pane configurations have been available. When properly installed, extra panes give better insulation and efficiency.
Movement of the sometimes heavy sash(es) is usually facilitated through the use of a pulley/counter-weight system. Weights hidden within the window frame act as a counter-balance making it possible to open and close the window without too much effort. If your windows are difficult (or impossible) to open this may be a simple problem with the counter-weight system and is easily remedied.
Sometimes the design will include the presence of hinges which allow the window to be locked open while also being detached from the counter-weights. This will facilitate ease of cleaning and can also enable quicker escape in times of emergency. Sometimes the use of spring balances is substituted for the more common pulley and chain (or cord) system.
Configurations designed for movement of both sashes within the frame are commonly known as ‘double-hung’ windows. While traditionally constructed of wood, they are now available in other materials including tough, durable PVC (poly vinyl chloride) plastic. These plastic windows are generally less expensive to buy than the wood models and are used widely for new construction and for window replacement.
Speaking of replacement, owners of older homes are often faced with the decision of replacing or repairing existing windows that have become inefficient or nonworking. If possible, repair is usually advisable to replacement. It’s cheaper, generally looks better and can be made to be nearly just as energy efficient.
If you reside in a conservation area (or your home is ‘listed’) your options may be limited by what’s allowed. Sash windows are a tried and tested design that continue to be the most popular and the older versions can be made to look good and operate properly with some well-directed maintenance measures. Study the options and benefits and then decide. Your home deserves to look and feel its best!
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