What is the maximum solar heat gain coefficient for all glazed fenestration?

The maximum solar heat gain coefficient (SHGC) for all glazed fenestration is set at 0.4 SHGC. This standard is established to minimize the amount of solar heat entering a building through windows and glass doors, which helps in reducing cooling loads and improving energy efficiency. A lower SHGC indicates that less solar heat is transmitted through the glazing, aiding in the overall goal of sustainability and energy conservation within building design.

By maintaining a maximum SHGC of 0.4, buildings can comply with regulations that promote reduced energy consumption and enhance indoor comfort. This threshold reflects a balance between natural daylighting benefits and the need to control unwanted solar heat gain, which is particularly significant in regions with high temperatures.