New energy codes are placing strict limitations on the amount of glass that can be incorporated into a new building. In high temperatures, glass simply lets in too much heat, and in low temperatures, too much cold. Reducing the amount of glass in a building reduces heating and cooling costs significantly.
The Energy Crisis (as it was labeled) in the United States in the late 1970s initiated the widespread installation of above-deck thermal insulation boards on low-slope roof systems.
