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Insulating glass is an evolution from older technologies known as double-hung windows and storm windows. Traditional double-hung windows used a single pane of glass to separate the interior and exterior spaces. In the summer, a window screen would be installed on the exterior over the double-hung window to keep out animals and insects.
A double-hung window where the upper sash is smaller (shorter) than the lower is termed a cottage window. [citation needed] A single-hung window has two sashes, but normally the top sash is fixed and only the bottom sash slides. Triple- and quadruple-hung windows are used for tall openings, common in New England churches.
A window is an opening in a wall, door, roof, or vehicle that allows the exchange of light and may also allow the passage of sound and sometimes air.Modern windows are usually glazed or covered in some other transparent or translucent material, a sash set in a frame [1] in the opening; the sash and frame are also referred to as a window. [2]
Double-paned windows are the norm in new residential installations, as they offer substantial energy savings in comparison to single-paned glass. Each individual glass pane has poor insulation properties, with an R-value (insulation), or measure of an object's resistance to heat conduction, of 0.9. However, when two panes are placed in series ...
Most modern windows use glazing spacers to keep the distance between their panes for sealing purposes. Many of these spacers are made from aluminum, which is a very conductive material. There is a better alternative for higher insulation performance: special plastic spacers, generally referred to as 'warm-edge spacers'. [5]
The 6.4 mm (1 ⁄ 4 in) and 7.9 mm (5 ⁄ 16 in) sizes are generally used for single hung windows, while the two larger sizes are used for double hung windows. As 9.5 mm ( 3 ⁄ 8 in) is not a common size, the 7.9 mm ( 5 ⁄ 16 in) thickness may be used instead and shimmed as needed.
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