20-foot-tall curved channel glass walls by Bendheim set a high standard for daylighting at the new University of Iowa Visual Arts Building. Steven Holl Architects selected the three-dimensional, U-shaped glass for its unmatched ability to create seamless curved walls of seemingly impossible spans, defying the norms of traditional glass architecture.

“It would be virtually impossible to create curved glass walls

of these dimensions without channel glass”

 

The light-diffusing channel glass walls bring high-quality, filtered natural light to the studios and open-loft spaces within, creating a bright and productive environment where students and instructors can mingle and work. The concave glazed openings are carved into the rectilinear building form, creating multiple “centers of light.” The undulating glass walls break up otherwise flat expanses, and draw the eye to explore and connect.

The unique geometry of the U-shaped channels makes the glass self-supporting, allowing it to span much greater distances than the architect could feasibly achieve with flat glass. Installed vertically – as in the Visual Arts Building – the glass can span heights up to 23 feet and limitless lengths, while requiring minimal metal framing.

“It would be virtually impossible to create curved glass walls of these dimensions without channel glass,” remarked Said Elieh, Director of Technical Design for Bendheim Wall Systems. “Even if the equipment and expertise to custom-bend 20-foot-tall glass were accessible and affordable, the openings would have required some form of intermittent vertical framing. Channel glass creates uninterrupted sightlines and an elegant, seamless appearance.”

The surface texture of the glass channels and the encapsulated translucent thermal insulation evenly diffuse light, acting as built-in glare control devices. Even the brightest direct sunlight is morphed into ideal, soft daylight, providing students greater comfort and flexibility within the space.

In addition to the impressive glare reduction and a high Visible Light Transmission (VLT) of approximately 40%, the insulated channel glass walls offer improved thermal performance, achieving a U-value of 0.24.

At night, the expansive glass curves and screened window openings evenly project interior light to the outdoors, creating a lantern effect.

To learn more about Bendheim channel glass, please visit www.bendheim.com/professional/systems.

The Children’s Hospital of San Antonio has put the finishing touches on a major retrofit, featuring a new Lamberts^® channel glass façade by Bendheim Wall Systems. The vibrant, ceramic-fritted glass units rise along the building’s 10 stories and a 2-story-tall ‘lantern’ cupola. The striking colors of the glass are visible from a distance in the day or night, while the smart technical design of the system makes this project truly stand out by answering a number of unique design challenges. It is the first and only installation of vertically-unitized, multi-colored ceramic-fritted channel glass in North America.

“Bendheim helped us with the pre-assembled panel design, which saved us thousands on the installation and allowed us to beat the schedule.”

 

The redesigned hospital exterior seeks to improve the patient experience. The translucent glass channels are visible from within the rooms, bringing children and families comfort and a sense of playfulness through color. The positive experience of the space reflects current attitudes and research into enhanced healing through sensitive clinical architecture and design.

Overland Partners, the architects charged with the project’s exterior, developed a range of criteria for the new glass façade elements: durability, structural capacity, custom colors, translucency, back-lighting ability, and ease of installation, among others.

They selected Bendheim’s channel glass – a three-dimensional, U-shaped architectural glass – for its remarkable structural qualities, light-diffusing surface texture, and vast range of translucent hues.

“The Children’s Hospital borders the Zona Cultural, a downtown district that is rich with history and culture distinct to San Antonio. The use of bright and vibrant colors is extensive in the area,” said Kris Feldmann, AIA, NCARB, LEED AP, Overland Partners. “The inclusion of color in the façade of the transformed hospital further solidifies it as an important institution to the cultural fabric of downtown San Antonio.”

The precise glass color selection was based on the hospital’s 8-story-tall mosaic mural, “The Spirit of Healing,” by local artist Jesse Trevino (see below). Bendheim was able to expertly match the colors of Trevino’s mural with our colored ceramic fritted channel glass.

The translucent frits are fused into the glass under high temperatures. Unlike paint, an applied coating, they deliver durable, weather- and scratch-resistant hues that can stand up to the elements.

One of the main design challenges for The Children’s Hospital was creating tall and light façade units that could sustain high wind loads. The unique geometry of Bendheim’s channel glass allowed it to achieve continuous vertical spans of 10 to 16 feet (3 to 5 m) in relatively lightweight ¼-inch (7 mm) glass thickness – weighing only 4.5 lbs. per sq. ft. (22 kg/m²) – a feat unachievable through conventional flat glass.

Another technical challenge was the installation of the glass assemblies on the building’s slim concrete eyebrows, located on the south and west façades. Speedy installation was essential, as well as avoiding the need for scaffolding, which would normally be required.

Bendheim Wall Systems’ technical experts met the challenge by working with Overland Partners and the installer, Sharp Glass, to develop a custom vertical unitized channel glass system.

“The close collaboration between Overland and Bendheim in the development of the colored glass panel system was key to overcoming the technical challenges of installing on existing facades with numerous unique conditions,” said Kris Feldmann of Overland Partners. “Bendheim’s technical expertise and willingness to roll up their sleeves to help figure out solutions for each application also gave the design team and contractor the confidence to lobby for the colored panels as an integral component of the project.”

The custom unitized channel glass system enabled the installer, Sharp Glass, to pre-assemble the glass units in its facility, transport them to the hospital, and hoist them into place as each floor became ready. A proprietary attachment mechanism allowed each unit to be easily pivoted and lifted into place, perfectly aligned, and secured to the structure.

 

“Our experience with Bendheim on The Children’s Hospital of San Antonio was nothing short of great,” said Alan Sharp, CEO of Sharp Glass. “Delivery schedules were met and the quality of the finished product was never an issue. Bendheim helped us with the pre-assembled panel design, which saved us thousands on the installation and allowed us to beat the schedule.”

Bendheim’s adjustable unitized system enabled the glazier to install, on average, an entire floor per day, without the need for costly, unsightly scaffolding. The speed and precision of the installation marked a significant achievement in the construction field.

The Children’s Hospital of San Antonio unveiled its newly enhanced facilities on May 25, 2016.