Definition for word: Insulated Glass

Used in windows and doors, two or three panes of glass with a sealed airspace between panes that improves insulating value.

Referrence from

When multiple glass panes or "lites" are assembled into units, they are commonly referred to as insulated glass, double glazing, Double Glazed Units (UK and Europe) or Insulating Glass Units (IGU) (North America and Australia).

These units use the thermal and acoustic insulating properties of a gas (or vacuum) contained in the space formed by the unit. They can provide good insulation without sacrificing transparency (visual transmittance (VT)). Single glazed tinted and reflective glasses can provide similar thermal insulation, but for the same insulation performance are harder to see through and provide little protection against unwanted sound.

Most IGUs are double glazed, but IGUs with three sheets or more, i.e. "triple glazing" are becoming more common due to higher energy costs. Insulated glazing may be framed in a sash, frame or in a curtain wall.

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