Double Glazed Units for Windows, Doors, Skylights

window glass panels
double glazed units
roof window
Double glazing is double or triple glass window panes separated by a vacuum or other gas filled space to reduce heat transfer across a part of the building envelope. Insulated glass units are manufactured with glass in range of thickness from 3 mm to 10 mm (1/8" to 3/8") or more in special applications. Laminated or tempered glass may also be used as part of the construction. Most units are manufactured with the same thickness of glass used on both panes[citation needed] but special applications such as acoustic attenuation or security may require wide ranges of thicknesses to be incorporated in the same unit. Most standard double glazed units are constructed with cavities around 16mm to 20mm and filled with Argon gas. The wide cavities are necessary to achieve the required insulation or U Value. Argon is a light gas and necessary for wider cavities. Argon cannot produce the best insulation in small cavities which require Krypton and Xenon to provide the best results. Some standard double glazed units still use an aluminium spacer to provide the required cavity.