707 Fifth Office Tower Offers an Attractive, Energy-Efficient Workplace

Glass Magazine
August 5, 2019
COMMERCIAL, FABRICATION
The new 707 Fifth "AAA" office tower in downtown Calgary,
Alberta, met its energy targets, due in part to the use of
Technoform's TGI Spacer M in the triple-glazed, curtain wall
system.

The new 707 Fifth "AAA" office tower in downtown Calgary, Alberta, features a distinctive, curved glass appearance with high energy efficiency and a comfortable interior, say officials. In spite of the cold climate, the 27-story, 564,000-square-foot building met its energy targets, due in part to the use of Technoform's TGI Spacer M in the triple-glazed, curtain wall system. The project is designed to achieve LEED Gold certification through the Canadian Green Building Council.

World-renowned architects Skidmore, Owings and Merrill designed the iconic, energy-efficient structure. The building's façade combines convex and concave forms to shape elliptical and undulating elevations. The floor-to-ceiling glass maximizes internal daylighting and comfort, minimizes unwanted solar heat gain and heat loss, and provides panoramic views of the city and the Rocky Mountains.

Bringing the vision to reality, construction manager EllisDon worked closely with Contract Glaziers West Inc. to engineer the custom, high-performance, unitized, structurally glazed, aluminum-framed curtain wall system, and to manufacture and install it to precise specifications.

The curtain wall relies on Tianjin North Glass' state-of-the-art, bent, triple-pane insulating glazing units with two low-emissivity coatings from G-Crystal Glass Group. Technoform's bendable, and durable, warm edge spacer separates the three panes of glass, creating an insulating barrier at the perimeter of the IGU to improve thermal performance. This combination of high-performance components allows the IGUs to meet the project's high thermal performance requirements and achieve the overall energy-saving, sustainability goals.

"Using Technoform's spacer for this application came from a recommendation by the Tianjin North Glass team," says Steve LeBlanc, Contract Glaziers West. "We affirmed their preferred spacer solution via our thermal modelling for the project, thus establishing that it would provide the performance values we required."

The thermal performance requirements of 707 Fifth included stringent whole unit U-factors of 0.16 hr/ft²F, according to Dirk Schulte, formerly with TNG. He says, "TNG proposed Technoform due to its unique portfolio of spacer systems, providing the ideal product solution for this high-end glass unit."

"Due to Technoform's industry reputation as a leader in providing thermal IGU spacers, thermal breaks and isolators, the product was readily accepted into the design,” says LeBlanc. “Overall, with the two layers of high-performance low-E and the warm edge spacers provided, we were able to achieve the wall performance desired by the design team and consultants."