Resources

Guides from our technical library, and the organizations, standards bodies and programs behind window performance in North America. External links open in a new tab.

GlasFëns guides

Choosing windows: Window & Door Types · Size Limits · Material Choices · Frame Width Comparisons · Glass and Glazing

Performance: U-Value & SHGC · Thermal Performance · Condensation Resistance · Air Infiltration · Daylighting · Structural & Weather Ratings

Ratings, codes and certifications: Overview · NFRC & ENERGY STAR · LEED · Passive House & Phius · Which Rating Applies? · Energy Codes, U.S. & Canada · Codes by Location · Key to NFRC Codes

Installation: Installation · Air Barrier Interface

Our products: Glass · Performance · Finishes · A-Series Hurricane

Standards and testing

• FGIA, Fenestration and Glazing Industry Alliance (formerly AAMA and IGMA): window, door and curtain wall standards, NAFS, installation training
• WDMA, Window & Door Manufacturers Association: co-publisher of NAFS
• CSA Group: Canadian standards, including CSA A440.2 and the NAFS Canadian Supplement
• NFRC, National Fenestration Rating Council: U.S. energy ratings and the Certified Products Directory
• ASTM International: test methods for air, water, structure, impact and installation
• ANSI, American National Standards Institute
• ABAA, Air Barrier Association of America: air barrier materials, installer certification and inspection
• Intertek Building & Construction: accredited product testing and certification

Codes and product approvals

• ICC, International Code Council: IBC, IRC and IECC
• DOE Building Energy Codes Program: state code adoption and compliance tools
• ASHRAE: ASHRAE 90.1 energy standard
• Codes Canada, National Research Council: National Building Code and NECB
• Florida Building Commission: Florida Building Code and Florida Product Approval
• Miami-Dade County Product Control: Notices of Acceptance (NOAs)
• U.S. Access Board, ADA Standards: accessibility requirements for doors and operable hardware

Energy efficiency and high-performance building

• Phius: Phius CORE and ZERO standards, certified windows and projects
• Passive House Institute (PHI), and its certified component database
• Passive House Network: education and policy in North America
• Passive House Canada
• ENERGY STAR windows, doors and skylights, and ENERGY STAR Canada
• USGBC, U.S. Green Building Council: LEED
• Lawrence Berkeley National Laboratory, Windows & Daylighting: THERM and WINDOW software
• Efficient Windows Collaborative: window selection tools
• DOE Office of Energy Efficiency & Renewable Energy
• NREL, National Renewable Energy Laboratory

Industry and professional organizations

• NGA, National Glass Association (merged with the Glass Association of North America)
• AIA, American Institute of Architects
• CSI, Construction Specifications Institute
• NIBS, National Institute of Building Sciences
• DBIA, Design-Build Institute of America
• APPA, Leadership in Educational Facilities
• The Aluminum Association