Windows are one of the most complex and expensive facets of the building envelope as they can account for approximately 10% of a building’s air inltration according to the U.S. Department of Energy, and can cost up to several thousand dollars per unit. The number, size, material choice and orientation of windows can make or break the energy efficiency of the entire building.

With so much on the line, it is important for windows to be weather and water tight. There are slightly less than 100 different American Society for Testing and Materials (ASTM) tests and 40 American Architectural Manufacturer’s Association (AAMA) standards, in addition to various other NFRC, ANSI, ASCE, CPSC, NFPA, UL and GANA Standards pertaining solely to windows. One of the most specified glazing products in multi and single family construction is the vinyl window.

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