Envoy Hotel Boston

Boston, MA

The six-story structure features 136 guest rooms, ground floor retail space, and a 4,000-square-foot roof deck sporting the Lookout Rooftop and Bar with spectacular views of stunning waterfront, harbor and city views. A second restaurant, the Outlook Kitchen and Bar, is located on the ground level along a Harborwalk promenade. Other amenities include a state-of-the-art fitness room and lobby workstations and printers.

Girder-slab System
The 100,000-square-foot project was constructed using a structural steel frame with an integrated precast concrete planking system. The structure includes steel sheet pilings with cross-lot bracing and utilized 124 precast concrete piles. Exterior façade consists of glass and metal curtainwall.

According to Bernard M. Rouillard, P.E., of McNamara • Salvia Structural Engineers, “the steel-framed structure utilized the girder-slab system supporting 8” thick precast hollowcore concrete plank.” Planks, he says, are 8’-0” wide and varied from 22’ to 26’ long. The precast planks provide erection stability, allowing the erector to place both the steel framing and the precast concrete plank in rapid succession.

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Projects details

  • PrecasterJ.P. Carrara and Sons Inc., Middlebury, VT

  • OwnerHersha Hospitality Trust, Harrisburg, PA (current) Norwich Partners (through its subsidiary, FPC Hotel LLC), Lebanon, NH (original)

  • ArchitectStantec/ADD Inc., Boston, MA Group One Partners, Inc.

  • Structural EngineerMcNamara • Salvia Providence, Boston, MA

  • ContractorLee Kennedy Company, Quincy, MA


  • 100,000 (residential)

  • 4,000 (ground floor retail)

  • 65,700 (hollowcore plank)

  • Levels/Floors: 6-story

  • 345 pieces of precast concrete hollowcore (8-in thick, 8-ft wide, and 22-ft to 26-ft long).rces

  • 65,700 square feet of hollowcore in all.

  • 124,000 square feet of precast concrete piles.