Metal Construction News, November 2018

York University Station Toronto Completed December 2017 Total square footage 230090 square feet Owner Toronto Transit Commission TTC Toronto Design architect Foster Partners London www fosterandpartners com Architect of Record Adamson Associates Architects Toronto www adamson associates com General contractor EllisDon London Ontario Canada www ellisdon com Prime consultant engineer of record Arup Canada Toronto www arup com Roofing contractor Bothwell Accurate Co Inc Mississauga Ontario www bothwell accurate com Curtainwall Josef Gartner USA a division of Permasteelisa North America Corp Burr Ridge Ill www josef gartner permasteelisagroup com Circle 39 Metal sub framing system Radius Track Corp Minneapolis www radiustrack com Circle 40 Metal roof panels Kalzip Ltd St Helens United Kingdom www kalzip com Circle 41 Snow retention system S 5 Colorado Springs Colo www s 5 com Circle 42 Accurate Co Inc Mississauga Ontario Canada The complex geometry of the roof design and the support structure required us to produce 3 D digital models to produce the drawings explains McGrath We also 3 D printed many models of the roof design to test the geometry and the intersections of various components We found that the standing seam metal roof was the best solution for our complex roof geometry To achieve a lifetime roof assembly the inverted roof system was constructed with Radius Tracks Curved Right sub system that supported Kalzips standing seam panels which protect the two ply modified bitumen base layers The Curved Right sub system also adds space between the two ply membrane and the metal roof for exterior insulation which eliminates thermal bridging while providing lifetime support and shape for the metal roof panels For the project Radius Track supplied 4323 feet of its Curved Right framing system including its 16 gauge 1 5 8 inch curved hat channel 16 gauge 2 1 2 inch curved C stud and 16 gauge stand off clips all in G120 galvanized steel Kalzip supplied 12271 square feet of its 65 333 standing seam metal roof and Colorado Springs Colo based S 5 supplied 1000 feet of its ColorGard snow retention system Designed to meet Toronto Green Standards the York University Stations roof features a cool roof coating giving it high solar reflectance and which absorbs little heat The perimeter gutter system captures and reduces stormwater runoff into the municipal drainage system by using soft landscaped areas adjacent to the building runoff areas Natural Light According to McGrath the York University Stations design utilizes natural light to orient station users similar to the Canary Wharf station in London and the Bilbao Metro station in Spain This allowed us to simplify the movement of people and make the experience of using the station more intuitive and easy to navigate he explains A double height curtainwall from Josef Gartner USA a division of Permasteelisa North America Corp Burr Ridge Ill is glazed on every side creating a light well filling the concourse with natural light The stations exposed diagrid coffered roof structure is supported by V shaped columns which maximize the open area The mullioned curtainwall structure spans from a concrete upstand at the base and extends to the roof eaves soffit panels McGrath explains Structurally the mullions run through the soffit panels to connect the steel circular section roof ring beam that sits on four concrete walls Photo courtesy of Toronto Transit Commission November 2018 METAL CONSTRUCTION NEWS 21 www metalconstruct ionnews com