Technical Advice | Structural Glazing
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We do not make up topics just to get clicks. Our topics come from the questions people really ask us. Architects ask us when they plan a building. Builders ask us on-site. Homeowners ask us when they plan their project. If the same question keeps coming up, we write about it.
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A completely transparent, walkable glass structure that connects seamlessly to a frameless balustrade is the holy grail for architects in need of the lightest, most open aesthetic. We’ve refined this approach to perfection, with all-glass supports at the floor’s edge. Traditionally, a steel beam would be needed to prop up that open side of the floor, and you’d usually need some form of post or railing on top. However, this adds more visual intersections to the glass floor design. To overcome this design issue, we have developed a bespoke solution: a structural glass beam (an unsupported glass beam) that sits under the glass floor and continues above it to form the balustrade.
Architects usually have two priorities in mind when they ask about an all-glass balcony or walkway. They want maximum transparency and a minimalist look, but your glass can’t just float in mid-air. Something has to support the glass floor and be strong enough for the required pedestrian load. Now you can achieve complete design purity by replacing the steel support with a structurally engineered glass beam, which supports the floor and acts as the balustrade. It’s a single piece of glass doing two jobs at once, avoiding visual clutter and maintaining an uninterrupted sightline.
At Artist Studio, a glass floor was specified to bridge a void leading to a staircase. From below, you can see just how clean the construction is. There’s no steel beam slicing across your view, just a glass walkway and a barely noticeable unsupported glass beam underneath. Because the floor meets this void, the beam also extends upward to serve as a balustrade. This means that everything, support and barrier, becomes a single, continuous piece of glass. Up close, you can appreciate the polished edges and the careful lamination that allow this piece to double as both a floor support and a guardrail.
Lowndes Square takes a similar approach and adds a subtle etched pattern on top for slip resistance. Once again, an unsupported glass beam runs beneath the open edge and continues above to form the protective barrier. By removing any need for a steel channel, we created a “floating” walkway, allowing light to penetrate down to the lower level. It shows how reliable, simple and innovative our structural glazing can be. Find the case study here!
Behind the scenes, a lot of engineering goes into making these floors and balustrades functional and with the project performance specification. First, we calculate the loads the unsupported glass beam will carry, and not just in terms of the pedestrian load. Balustrades have separate horizontal load requirements and impact considerations, so the glass can handle both the downward forces of foot traffic and the lateral forces that might come from someone leaning against it. We typically use laminated glass with specialised interlayers that provide additional strength and ensure that if one layer of the laminate is damaged, the entire panel doesn’t suddenly fail.
Equally important is the structural silicone bond between the glass floor panels and the glass beam. The joints at the edges are carefully engineered to prevent water from seeping into the laminate. These details are crucial for longevity and for keeping the entire assembly free of haze or delamination, so no weak points or unsightly edges show up in the longer term.
From a design perspective, you get maximum light, uninterrupted sightlines and a guaranteed focal point. Architects are keen to explore merging two structural requirements into a single glass element with a consistent design language. Developers take notice of the added wow-factor that can elevate a property’s profile, whether it’s a private residence, a boutique hotel or a high-end commercial site. Everyone loves a clear view, and removing steel girders with an unsupported glass beam makes spaces feel more spacious, refined and futuristic.
If you’re considering this approach for your next build or renovation, think about the structural opening, your aesthetic goals and how early you can involve us. A glass floor with an integrated balustrade can be installed in a mezzanine, a balcony overlooking a living area, or a bridge connecting two parts of a building. IQ can help you get the detailing spot-on and ensure installation goes off without a hitch. As you can see, the result is truly spectacular.
Standing on a bridge of glass is a bold statement in modern design, and combining that with a frameless balustrade heightens the drama. Are you looking for a crisp, modern aesthetic with maximum visual impact?
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