Gable and hip ridge systems.
The possiblities are endless.

Our Most Popular Skylight Systems


Standard, custom, and extended
The possibilities are endless.


Hip or valley, standard or custom.
The possibilities are endless.

Our Capabilities

With over 40 years of experience in the industry, E-GSI, formerly known as GSI, continues to thrive on our committment to excellence in the development and production of virtually any skylighting, shading, or roof system.

What we are well known for:
- Innovative and competitive systems
- Patented water and condensation control
- In-house design, fabrication, & assembly
- Excellence in materials and workmanship
- National and international capabilities

Quick Links

US Department of Energy
US DoE: Efficiency & Renewable Energy
International Code Council
US Department of Energy
Glass Association of North America
US Green Building Council
4specs.com
The American Institute of Architects

Resources

Whether you are an architect, developer, contractor, or homeowner visiting our website, we hope that we can not only serve as your one-stop-shop for projects, but also be a valued source of information.

- Terminology

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Skylights in Chicago