Redwood City, CA

Crossing 900


Adjacent to the Redwood City Caltrain station, Crossing 900 includes two mid-rise office buildings sharing a landscaped podium over retail space and below-grade parking. The Level 4 podium connects the two towers, which are seismically separated with an expansion joint at each above-grade level up to the podium level. SGH was the designer of record for roofing and waterproofing systems.

SGH designed below-grade waterproofing, podium waterproofing, and low-slope roofing. Highlights of our work include the following:

  • Established performance criteria for the roofing, waterproofing, and expansion joint systems
  • Collaborated with the design team to coordinate the structural slab, landscaping, and drainage for the podium
  • Designed typical details for the roofing and waterproofing systems and developed details to integrate roofing and waterproofing systems with other enclosure systems
  • Designed the waterproofing system for the seismic expansion joint at the podium to accommodate movement up to 8 in.
  • Coordinated the expansion joint design with landscape finishes to make it as inconspicuous as possible
  • Assisted the project team with value engineering evaluations of concrete placement methods for below-grade walls
  • Provided construction administration services, including reviewing related submittals, responding to contractor requests for information, and visiting the site to perform special warranty inspections and observe as-built construction to compare with the design intent

Project Summary



Completion Date


New Construction
Building Enclosures
Commercial | Mixed-Use
Korth Sunseri Hagey Architects
Specialized Capabilities
Roofing & Waterproofing

Key team members

Kenneth Klein
Kenneth Klein
Senior Principal
James Mendygral
James Mendygral