Glass has become one of the most versatile structural materials in commercial architecture. It carries loads, defines how people move through a space, and turns daylight into a design feature, whether it’s underfoot as a walkable floor or rising fifty feet as an illuminated tower.
Few companies understand structural glass better than Circle Redmont®, a manufacturer with more than 60 years of experience engineering custom glass systems for iconic projects across the country. Among the most recognizable is Chicago’s Crown Fountain, whose glass-brick towers show just how far structural glass can be pushed when engineering and design work in step. Let’s look at what makes structural glass possible, and where it’s reshaping commercial spaces.
What Makes Structural Glass Possible?
The short answer: laminated safety glass and careful engineering. Structural glass systems use multiple bonded layers of glass, so if one layer sustains damage, the assembly remains intact. That redundancy is built in by design.
Each component is engineered to meet specific structural requirements. In load-bearing applications like walkable floors, live loads—the weight of people moving across the surface—are calculated separately from dead loads, which account for the fixed weight of the installation itself. Surface and finish treatments add performance and effect without sacrificing clarity. Every project is custom-engineered to local building codes and its intended use.
Project Spotlight: Crown Fountain, Chicago
The Crown Fountain is one of Chicago’s most beloved public landmarks and a landmark of structural glass. Located in Millennium Park and designed by artist Jaume Plensa, it’s built from two 50-foot glass-brick towers that stand at either end of a shallow black-granite reflecting pool. Behind the glass, large LED screens project the faces of Chicago residents, and water spills down the towers and appears to spout from their mouths.
Assembling towers of this scale from glass brick—outdoors, in Chicago’s climate, wrapped around active LED and water systems—demanded exacting tolerances, durable materials, and optical clarity that holds up to constant public view. Circle Redmont® designed custom-engineered glass systems to meet those requirements without compromising the artistic intent.
The fountain is a vertical showcase of structural glass; a walkable floor is its horizontal counterpart. The loads and surfaces differ, but the discipline is identical: when a project asks glass to do something most materials can’t, the details decide whether it succeeds.
Engineering Considerations for Structural Glass
Whether glass is carrying foot traffic or standing as a tower, a few considerations shape every structural glass specification:
Load Requirements: Load-bearing systems must account for both live and dead loads. In high-traffic floor applications, that means designing for concentrated point loads. Pedestrian flow, emergency load scenarios, and equipment access all factor into the specification.
Safety Systems: Laminated glass construction is standard. Redundant structural support (typically a steel or aluminum framework) ensures the system performs even under unexpected stress. Circle Redmont®’s systems include all components: glass panels, framing, hardware, and shop drawings.
Environmental Performance: Outdoor and semi-outdoor installations must account for thermal expansion and moisture. Sealed systems prevent water infiltration, while engineered tolerances allow for seasonal movement without compromising structural integrity.
Where Structural Glass Is Used
Common applications include:
- Walkable Floors and Landings: Load-bearing glass floors that bring daylight down through a building and create openness between levels.
- Public Plazas and Civic Art: Interactive installations—like the Crown Fountain—where structural glass becomes the centerpiece of a shared space.
- Museums and Cultural Centers: Viewing platforms and architectural exhibit walkways that create memorable visitor experiences.
- Commercial Buildings: Office lobbies and retail environments where glass signals design ambition.
- Bridges and Elevated Walkways: Glass bridge applications and observation decks where the view is part of the point.
- Sidewalk Vault Lights: Time-tested structural glass that channels daylight into below-grade spaces.
Why Architects Choose Structural Glass
Natural daylight is one of the most requested features in commercial design, and structural glass delivers it in ways conventional windows can’t, moving light vertically between floors and into spaces that would otherwise stay dark. A well-designed system creates visual openness, gives visitors an experience they won’t forget, and signals a premium commitment to design that few other materials can match.
Beyond aesthetics, daylight has measurable value for commercial projects. USGBC notes that sufficient daylight has been associated with higher workplace productivity, better retail sales performance, and lower electric lighting energy use.
Circle Redmont® Engineering Expertise
Circle Redmont® doesn’t treat structural glass as a commodity product. Every system is fabricated to order, custom-engineered for the specific project’s load requirements, aesthetic goals, and site conditions.
Our team collaborates directly with architects, engineers, and contractors from early design through installation—bringing the technical depth and precision needed for complex, one-of-a-kind projects like the Crown Fountain’s glass-brick towers.
Frequently Asked Questions
Q: Is structural glass safe?
A: Yes. Properly engineered and installed structural glass is designed to meet strict safety and building code requirements. Laminated construction and redundant support systems ensure performance even under unexpected stress.
Q: How much weight can a structural glass floor support?
A: Load capacity depends on the glass system, support structure, and project requirements. Each installation should be engineered specifically for its intended use rather than relying on generic load ratings.
Q: What type of glass is used for structural applications?
A: Structural glass typically uses laminated safety glass—multiple bonded layers that provide strength, durability, and redundancy if one layer is damaged.
Q: How is a glass floor made slip-resistant?
A: Glass floors can include textured surfaces, frit patterns, sandblasted finishes, or specialty anti-slip coatings that improve traction while maintaining the desired visual effect.
Bring Your Structural Glass Vision to Life
Circle Redmont® has spent more than six decades engineering structural glass systems for projects that demand precision—from sidewalk vault lights to landmark installations like the Crown Fountain. Whether your project calls for a walkable glass floor, a glass bridge, or something no one has built before, our team is ready to help you spec, engineer, and fabricate a system built for your exact requirements.
Start a conversation with Circle Redmont today to begin your project right.
