What Is Insulated Glass?
Insulated glass, also sometimes called double-pane, is made in “units” which consist of two (sometime three) panes of glass separated by spacers, and sealed with tough synthetic sealants. The air inside is either left in place, removed or replaced with a gas. If the seal goes bad, you will see condensation inside the unit. At that point, you will know that the insulating value of the glass has been lost, and the condensation will increasingly obscure your view through the glass. The unit must then be replaced. Insulated glass can be made with internal muntins, the grid that makes the opening look as though it has multiple panes of glass.
