Guide to double glazing for homeowners

Double glazing, also known as insulated glazing, is a double or even triple glass window pane enclosing with multiple glass combinations separated by a sealed air space or other sealed gas. The air space minimises heat losses in buildings, which has a wide range of applications. One of the main benefits of insulated glazing is the dimensional stability it offers under a wide range of temperatures.


Insulated Glass Units (IGUs) or double gazing units are designed to satisfy various needs. Some IGUs are designed to keep heat inside buildings while others are designed to keep heat, light, glare and noise out of the home. The intended use of the glazing units determines the composition and manufacturing design used.

Generally, materials used to manufacture IGUs comprise of versatile components, such as PVC, aluminium and timber. Tempered or laminated glass is used for double glazing panes. The thickness of glass used is usually between 6mm and 12mm, although wider glass is also used for special applications, such as for acoustic purposes.


Insulated glazing is used to make low-emissivity glass, also referred as Low-E glass, which lets light and heat in and prevents the heat from escaping. Double glazing is also used to make tinted glass, reflective glass and spectrally selective glass that reduce the amount of ultraviolet light that gets into the house. Tougher glass than the standard glass in the market is also made for security reasons by double glazing.

Choosing the right double glazing unit for your home can make the home more comfortable both in hot and cold weather. Moreover, the right glazing unit keeps noise out, lowers home energy consumption, gives the perfect transparency for windows and reduces condensation of warm air in the home, which causes rapid deteriorate of furniture and other home decor.


Double glazing units typically last 10 to 25 years, depending on a number of factors including the quality of manufacturing material used, location of installation, size of gap between the outer and inner pane and workmanship. The units normally carry a manufacturer warranty. When purchasing your IGU, consider the warranty and follow the manufacturer’s installation and maintenance instructions to ensure your warranty remains valid for the life of the unit.

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