Project at a Glance
Architect: Pelli Clarke Pelli Architects; New Haven, Conn.
Artist: Julie Chang; San Francisco, Calif.
Owner: Transbay Joint Powers Authority; San Francisco, Calif.
Terrazzo Contractor: Associated Terrazzo Company; San Francisco, Calif.
General Contractor: Webcor/Obayashi, Joint Venture; San Francisco, Calif.
Resin Supplier: Terrazzo & Marble-Supply Companies
Aggregate Supplier: Terrazzo & Marble-Supply Companies
Precast Supplier: Tectura Designs, a Wausau Tile Inc. Brand
Divider Strip Supplier: Manhattan American- Terrazzo Strip Company
The National Terrazzo and Mosaic Association (NTMA) has named the San Francisco Salesforce Transit Center as its 2019 Job of the Year.
Over 10 years in the making, the terminal’s Grand Hall features an intricate public art installation in terrazzo. Sixteen colors and 375 waterjet-cut elements of brass and zinc form the “Secret Garden” design, showcasing a collection of hummingbirds, poppies, brass insects and abstract shapes.
The terrazzo was installed on a concrete topping slab that contains a radiant flooring system over several inches of rigid foam insulation.
The design and installation of the floor also had to take into account a second phase of construction in which large structural slabs will be removed for the installation of escalators to provide access to projected commuter and high-speed rail.
Besides the Grand Hall installation, another 6,000-square-feet of single-color epoxy terrazzo flooring was installed in five different areas of the building at the same time, including five staircases of precast terrazzo and 11 elevator cab floors.
When installers were asked to expedite the six-month installation schedule, they trimmed a month off and increased the quality of the bent divider strip patterns by pre-fabricating the divider strips on panels, many as large as 11-by-17 feet, aligned on the construction site.