Curved Metal Framing System Sets the Roof Geometry at York University Station


York University Station | Toronto, ON, Canada


Provide a cold-formed steel (CFS) framing system for a 1,140 square meter compound curving roof with sufficient depth to incorporate continuous insulation and a vented cavity above the 2-ply modified bituminous membrane.

  • Digitally coordinate as-built structural roof deck, CFS framing, roof assembly layers to meet design intent, and project schedule.

  • Develop a CFS framing system to set the geometry for the doubly curving metal panel roof.

  • Fabricate and deliver approved CFS framing elements with installation instructions according to schedule.


Radius Track developed a two-way cold-formed steel framing system using computational modeling, physical prototypes and contractor coordination to optimize constructability and installation.

  • Custom cold-formed steel framing elements precisely curved to shape the roof’s compound curves.

  • A two-way system of framing elements divided into stick built and unitized layers to optimize installation.

  • Digital coordination with the roof panel manufacturer to ensure geometric accuracy between framing and finished skin systems.


The Radius Track two-way cold-formed steel framing system was GEOMETRICALLY PRECISE and thoroughly COORDINATED with both the as-built structure and the metal panel roof system to deliver the compound curved boomerang shaped roof that was a key design element of the metropolitan transit hub.


  • Design Architect: Foster + Partners

  • Architect of Record: Adamson Associates

  • General Contractor: Ellis Don

  • Roofing Contractor: Bothwell-Accurate

  • Architectural Sales Rep: Exterior Technologies Group

  • Pre-Curved Sub Framing: Radius Track Corporation


  • 2018 Metal Construction News Building and Roofing Award; Category: Metal Roofing

  • 2018 Canadian Roofing Contractors’ Association (CRCA) Award for Workmanship & Innovation



“We did not have to worry about the geometry and setting out points. Radius Track provided a very clear layout system the we used to set everything from the curved hat-channel to clip angles, site assembled curved framing units and finally the standing seam metal roof. It all fit and was quite amazing.”

– Trevor McGrath, Estimating Manager, Bothwell-Accurate (Roofing Contractor)