Büro Ehring

Beginning on the 7th floor and terminating on the building’s penthouse level, 21 Garden Street’s 20-feet cantilever hovers well over the adjacent townhouse’s roof as the main expression of the project.

One of the most complex issues the design and construction team encountered during the final stages of the design phases was how we were going to support the cantilever formwork.

Ultimately, Peri Formwork System, Inc. were brought on board and tasked with providing a solution to the cantilever formwork in question. Temporary modular steel trusses were installed and anchored into the building’s newly constructed roof.

Vertical cables, hung off the trusses, support the crash deck in preparation for the construction of concrete diagonals, the cantilever transfer deck, and the stories above. The overhead truss system proves to be versatile because of its capacity to allow for vertical adjustment of the formwork as the concrete is poured and deflects due to concrete weight, if needed.

Diagonal cables supporting the crash deck, along with connections back onto the structure’s main core keep the platform from swaying in the wind.

Services Provided: Structure (+ Façade)
Architect: DXA Studio
GC: Cavan Builders
Formwork: Peri Formwork