Sash windows have been around since sometime in the seventeenth century. Like all windows they are there to allow light and ventilation into the house. The term sash means a panel or frame that holds one or more glass panes. The panel is installed in the window frame in such a way as to allow the both to slide up and down independently of each other.
The panels slide vertically in the vast majority of cases. Though it is rare, nonetheless it is possible to encounter an arrangement where they slide horizontally. Each panels is seated in its own groove which is the full height window frame height. This is what enables to two to slide independently of each other. It is what allows them to slide to any position on the length of the frame, even to overlap each other.
In most traditional styles each frame is made up of a number of glass panes. These are called “lights”. Each light is separated from the others by thin wooded strips called muntin bars. The whole assembly of panes and muntin bars is fitted rigidly into the bigger frame. Occasionally it is possible to find these types of windows with just a single large pane of glass in each panel. This is relatively rare.
Each panel is made up of side rails called styles style and top and bottom rails. The top rail on the bottom panel and the bottom rail on the top panel, which sit flush with each other when the window is closed, are thus called “meeting rails”.
The single most important component of such windows is hidden away. On each side window behind the wooden frame is a hollow area. This is called a box, or a case. Inside the box are weights. These weights are connected to the window frames and act as counter weights. Without them it would be next to impossible to open the windows.
Each panel has its own two counter weights. There is a cord called a sash cord attached to the panel’s hidden sides. This cord passes up the side window frame’s grooves and over a recessed pulley at the top. It then comes down inside the box section where it is attached to the weight. These weights together are nearly the same weight as the frame, so that with them attached, lifting is no longer a problem. They even allow the frame to remain at whatever height the owner wishes, with no risk of it falling down.
These attractive windows can last a lifetime and give few problems. Unfortunately, usually due to questionable workmanship, this is not all the case. Many people encounter one or all of these problems. Rattling. This caused by careless fitting or the expansion of wooden parts. It can also be caused by the wind. This problem can relatively easily be remedied by a skilled craftsman. As can the problem of jamming or sticking. This is usually caused by sloppy painting, or by the wood expanding over time.
Despite the few extra problems and maintenance issues, Sash windows are still regarded by many people as the most aesthetically appealing of all windows. There is one important proviso of course. It is that the sash windows should be appropriate to the building’s architecture, in which they are installed.
Sash window restoration London area gives new life to your worn and old windows. Your sash window company has the experience and knowledge to improve the look and operation of the windows in your home or business.