Like more or less all window in buildings of relatively tradition design, Sash windows are there primarily to let light in and to permit easy ventilations or the room if and when that is required. The definition of “sash” as it applies to windows and what most people understand the word to mean is a window consisting of two frames of glass panes that slide in order to open. Each of these frames is knows as a “sash”.
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”.
A crucial aspect of most traditional sash windows is the “box”. This is where the term “box windows” comes from. On both sides hidden inside the window frame, there are hollow areas roughly the same height as the window itself. Inside this box section are weights. These are usually made of steel or lead. The weights are there to make it easy and safe to lift the heavy panels for opening. Big windows would be impossible to lift without such counter weights.
Attached to the hidden sides of each frame is a cord (or occasionally a chain) which passes up and over a recessed pulley. It then goes down into the box section where it is attached to the weight. With the weighs attached, the window can be opened with ease. Because of weight balance with the frames, each frame can be left open at any height without the risk of it falling back down.
For all their ingenuity, these windows are susceptible to unique problems. If they are not painted very carefully, they have a tendency to stick or jam. If they are not fitted correctly they can allow significant drafts into the house. Related to that they tend to rattle in strong winds. All these issue can be put right by a trained window fitter. There are many effective draft proofing systems now available specifically designed for these types of windows. The same systems solve the rattling problem simultaneously.
Most people find Sash windows to be very aesthetically appealing. This is generally only true, though when they are installed in a period style residence. Installation in an inappropriate building usually has the opposite effect.
Sash window restoration London locale gives new life to your old and worn windows. A sash window company has the knowledge and experience to improve the look and operation of the windows in your home or business.
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