The Glassroom

Glass Conventions and Configurations of Glass (IGUs)

An insulated glass unit, or IGU, is comprised of two or more panes of flat glass – or glass “lites” - separated by a spacer material and sealed at the edges. Commonly, the end result is also known as double- or triple-glazing.

The glass in these lites can be clear, low-E, reflective, laminated, and decorative, depending on the performance requirements, and can also be heat-strengthened or tempered. The space between the glass panes is filled with dehydrated air and/or a noble gas, which can be argon or krypton, and can help enhance the unit’s insulating properties.

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