St. Lawrence Market North, Toronto

With its green roof initiative, the City of Toronto is meeting its sustainability goals and creating an impressive green space in the heart of the city – one that not only serves as a habitat for many plant and animal species but also significantly enhances the city's visual appeal. As with traditional pitched roofs, for barrel-vaulted roofs, a roof pitch exceeding 35° requires a site-specific feasibility study as well as more extensive measures regarding shear transfer and erosion control. The roofs of St. Lawrence Market North cover a total of 2,000 m², of which 1,500 m² was available for greening after accounting for ventilation systems and other roof structures. Of this, 1,100 m² is accounted for by the gently curved surfaces of the barrel-vaulted roof with a pitch of 0° to 25°, for which the Zinco "Pitched Green Roof" system with Floraset® FS 75 was ideal. Another 400 m² is accounted for by the steep edge areas on both sides, each with a slope of up to 45°. Here, the Zinco "Steep Pitched Green Roof" system with Georaster® was used, including additional measures to prevent shearing.