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U-factor measures how well a product prevents heat from escaping.
Solar Heat Gain Coefficient (SHGC) measures how well a product blocks heat caused by sunlight.
Advances in glazing materials for windows (254 KB)
Until recently, clear glass was the primary glazing material used in windows.
Windows typically have a higher U-factor than the rest of the building envelope so structures with high glazing areas are less likely to comply with the energy code.
The solar heat gain coefficient (SHGC) for your window may be found on the National Fenestration Rating Council (NFRC) label affixed by the window manufacturer prior to sale.
Glass has been used for thousands of years to allow daylight into our buildings, while providing weather protection.
This article is based on questions regarding Windows asked during the May REScheck Webcast as well as questions received through email.
The terms "fenestration", "window", and "glazing" are often used interchangeably. However, window actually describes a system of several components. Window is the term given to an entire assembly comp...
Compliance for site-built glazing systems is comparable to other assemblies within the building envelope but can be challenging because documentation on glazing performance values-U-factor, Solar Heat...