Glazing (window)

[5] Glazing can be mounted on the surface of a window sash or door stile, usually made of wood, aluminium or PVC.

The glass is fixed into a rabbet (rebate) in the frame in a number of ways including triangular glazing points, putty, etc.

Glazing is commonly used in low temperature solar thermal collectors because it helps retain the collected heat.

Continuous plate production was invented in 1848 by Henry Bessemer, who drew a ribbon of glass through rollers.

However, the sodium ions are water-soluble, which is not a desired property, so calcium oxide (lime, CaO) is added to reduce the solubility.

[7] Approximately 25% to 30% of HVAC energy costs stem from heat gain and loss through the glazing in windows.

The strategy to reduce conduction is the use of Insulated glazing, where two or more panes of glass are used in series, each separated from each other by a space.

Double-paned windows are the norm in new residential installations, as they offer substantial energy savings in comparison to single-paned glass.

Higher R-values still can be obtained by filling the gap with a less conductive gas such as argon (or less commonly, krypton or xenon).

This technology was first launched commercially in 1996, and while several million units have been produced in the ensuing decades, it remains prohibitively expensive for most use cases and has yet to see widespread adoption.

However, the additional manufacturing step adds to the cost of production, and the coating will degrade when exposed to the elements, and so can only be placed on the inside faces of a double-paned window.