Sash WindowsWhat are they and how do they work?

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So, what is a sash window?

A sash window or hung sash window is made of one or more movable panels or "sashes" that form a frame to hold panes of glass which are often separated from other panes. Although any window with this style of glazing is technically a sash window, the term is used almost exclusively to refer to windows where the glazed panels are opened by sliding vertically, or horizontally. Sash windows are common in Britain and its former colonies including the United States. The design of the sash window is attributed to the English scientist and inventor, Robert Hooke.


The sash window is often found in Georgian and Victorian houses, and the classic arrangement of sash windows has three panes across by two up on each of two sashes.


How does a Sash Window work ?

The weight of the sash window glazed panel is usually balanced by a counter-weight concealed within the window frame. This is connected to the sash window by a sash cord or chain which runs over a pulley at the top of the frame, although spring balances are sometimes used. Sash windows may be fitted with simplex hinges which allow the window to be locked into hinges on one side while the counterbalance on the other side is detached, allowing the sash window to be opened for escape or cleaning.


Sash windows offer many advantages such as looks, durability, and use of natural resources etc. It is also possible to clean all the glass from within the building by sliding the two panes to different positions.


Fixing a Sash Window

Many people choose to replace sash windows and opt for uPVC. While these may be effective against draughts and give some noise insulation, they rarely match the original wood windows in appearance. These modern materials do get shabby remarkably quickly, the springs and nylon fittings break, the sealed units are often poor and suffer from internal condensation. These problems are expensive to remedy.


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