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National Glass Association

Founded in 1948, the National Glass Association (NGA), combined with the Glass Association of North America (GANA) on February 1, 2018 to form the largest trade association serving the architectural glass and metals industry supply chain, including glazing contractors, full-service glass companies, glass fabricators, primary glass manufacturers and suppliers to the industry. It is a technical powerhouse that brings some of the best minds to the table to create technical resources and promote and advocate for glass in buildings. NGA’s education and training programs—both online at and in-person at association-sponsored events—and its official publication Glass Magazine, keep the industry knowledgeable and well-informed. NGA also produces the industry’s largest annual trade show in the Americas, GlassBuild America, and hosts the Building Envelope Contractors Conference, the Glazing Executives Forum and other educational and networking events, bringing together thousands of industry professionals to help them build more profitable businesses.

Window & Door Dealers Alliance

The Window & Door Dealers Alliance (WDDA) represents the interests of retail, wholesale, and installing dealers of new and replacement windows, doors, skylights, and related building products. The WDDA is the only national business organization advancing the interests of independent window and door dealers. The WDDA is an initiative of the National Glass Association. More information can be found at

American Architectural Manufacturers Association

Based in Schaumburg, IL, the American Architectural Manufacturers Association (AAMA) is the leading trade association for the North American fenestration industry. AAMA's member companies include manufacturers and suppliers of windows, doors, skylights, curtain wall, storefronts and related materials and components for the residential and commercial markets. Focusing on both technical and marketing services, AAMA's activities include standards development, product certification, market research and educational programs for the fenestration industry. For more information on AAMA, visit

Insulating Glass Manufacturers Alliance

Based both in the United States and Canada, the Insulating Glass Manufacturers Alliance is a North American association of insulating glass manufacturers, suppliers of component materials, and other industry-related professionals. IGMA is dedicated to upgrading product performance by promoting awareness of technological developments in the industry through educational events, technical publications and certification. For more information on IGMA, visit