Insulating Glass

Insulating glass units are designed to offer improved thermal performance by reducing heat gain or heat loss through the glass. Based on the various glass types specified, the insulating glass can meet multiple building code requirements and design aesthetics. GGI makes specifying high-performing glass easier because of the broad range of specialty glass types produced and stocked, combined with state-of-the-art technology used to fabricate multi-functional insulating glass units for commercial building applications.


  • Double and triple glazing up to 2-1/4” overall
  • Dual sealed units for commercial applications
  • Super Spacer® T-Spacer™ warm edge technology
  • Black primary and secondary sealants
  • Secondary silicone seal
  • Air and argon gas filled options
  • Annealed and heat-treated
  • Offset units, shapes and arches
  • Oversize tempered and insulating capabilities
  • Minimum size: 14” x 14”
  • Maximum size: 106” x 157”
  • High performing [soft coated] low-e glass
  • Pyrolytic [hard coated] low-e and 4th surface units
  • Decorative and other specialty glass options
  • Energy efficient for greater indoor comfort
  • Safety, impact and sound control glazing options

Note: Maximum recommended sizes are subject to the glass thickness and configurations specified.

Information & Samples


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Super Spacer® T-Spacer™
Warm Edge Technology: Learn More


Insulating glass units are made utilizing two or more lites of glass that may be separated using a spacer material around the perimeter. The glass and spacer materials are enclosed using a hermetically sealed air space. The spacer contains a desiccant material that functions to keep the cavity (airspace) of the insulating glass unit free of visible moisture.

Varying glass types, thicknesses and configurations may be used to meet the design requirements for bird friendly glazing, daylighting, energy-efficiency, impact resistance, outdoor views, and sound control while also achieving a unique aesthetic.

GGI insulating glass units follow the performance requirements and testing procedures as defined in the ASTM International documents:

  • E 2188 Standard Test Method for Insulating Glass Unit Performance
  • E 2189 Standard Test Method for Testing Resistance to Fogging in Insulating Glass Units
  • E 2190 Standard Specification for Insulating Glass Unit Performance and Evaluation



GGI is a member of the U.S. Green Building Council in support of sustainable building design and environmentally friendly manufacturing processes.