RDH was retained by Greenlite Glass Systems to provide Building Enclosure Consulting for the project’s roof-level walkable, two-hour fire-rated skylight system and the open-air Grand Hall. Developed as a series of “Light Columns,” the skylight assemblies bring natural light from Salesforce Park through the Grand Hall and toward the future train platforms below grade. The assemblies were required to address a demanding combination of performance requirements, including fire resistance, seismic movement, blast loading, pedestrian traffic, waterproofing, and long-term durability.
Working closely with Greenlite Glass Systems, Pelli Clarke Pelli Architects, and the broader project team, RDH provided design-assist consulting, reviewed design concepts and shop drawings, and advised on waterproofing, air infiltration control, thermal performance, drainage, and durability. RDH also supported the development of a full-scale assembly testing program to evaluate water and air resistance, puncture resistance at joints, UV exposure, adhesive durability, weathering performance, and water management through the system’s integral gutter assemblies. The design incorporated a replaceable sacrificial glass layer to support long-term maintenance and performance.
The project required balancing fire resistance, structural performance, waterproofing, and long-term durability within a highly transparent skylight assembly. The completed system contributes to a light-filled public environment while meeting the project’s life-safety and enclosure performance objectives. Recognized as one of the largest two-hour fire-rated walkable skylight systems constructed to date, the assembly supports the project’s design intent of bringing daylight deep into the facility.
