Insulated glazing (IG) more commonly known as double glazing (or double-pane and increasingly triple glazing/pane) is double or triple glass window panes separated by a vacuum or gas filled space to reduce heat transfer across a part of the building envelope. Normal double glazed glasses, double glazed glasses with Argon, double glazed glasses with spider dongles, laminated double glazed glasses, double glazed glasses with Louvers, double glazed glasses with Georgian bars, triple glazed glasses.
