Cambridge, MA

Twenty|20 at 20 Child Street

Scope/Solutions
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Project Summary

Scope/Solutions

Leading the development at East Cambridge’s NorthPoint site, Twenty|20 brings 355 apartment units to the growing neighborhood. The building also offers 8,600 sq ft of retail space and numerous amenities, including patios, an event room, a fitness center with a yoga terrace, an indoor basketball half-court, a courtyard lounge, landscape plaza areas, and underground parking. The nearly full-story glazing maximizes the great city views. SGH consulted on the building enclosure design.

SGH consulted on the design of the building enclosure, including below- and above-grade waterproofing, roofing, opaque cladding, and glazed systems. Highlights of our work included the following:

Reviewed the building enclosure design, featuring a sloped terrace with a hardscaped and vegetated stairway, long flanged strip-windows fabricated from curtain wall and corrugated metal panels, a green roof, a courtyard with private terraces and fire pit, and a roof deck
Recommended ways to improve performance and developed details to integrate the various building enclosure systems
Observed construction of a two-story wall mockup and recommended ways to improve construction sequencing, material compatibility, and constructability
Provided construction administration services, including reviewing contractor submittals and visiting the site to observe ongoing construction to compare with design intent
Oversaw an extensive quality control water testing program and helped the contractor resolve field issues