Cannabis Impairment Are You Ready for Cannabis in the Workplace? Page 12 Inside the OIRCA OIRCA Submits Ontario Fire Code Changes Page 16 Membership Profile Sarnia and Windsor Page 17 A Flowing, Undulating Roof Bothwell Accurate gets top honours for its inspiring work on York University Station. …Page 14 Cover Story 2018 Roofing Canada Award A Native Green Roof for the Indigenous Commons S ome roofing contractors relish the challenge of taking on complex roofing projects. Even when they come with an equally challenging green roof installation. One such contractor is OIRCA member Simluc Contractors Ltd. of Ottawa. They were tasked with the roofing and green roofing of the new DARE District at Algonquin College. The DARE (Discovery, Applied Re- search and Entrepreneurship) District combines the college’s new digital library with student collaboration space, the Innovation and Entrepre- neurship Centre and the Institute for Indigenous Entrepreneurship all adjoining a new central outdoor gathering space for the college’s students and faculty at the Indigenous Commons. Diamond Schmitt Architects in joint venture with Edward J. Cuhaci Architects undertook the task of taking the former two-storey library and transforming it into a dramatic barrel-vaulted three-storey building with nail-laminated timbers. At the same time the single-storey Institute for Indigenous Entrepreneurship was added to the north side of the existing building. Brook McIlroy of Toronto and Thunder Bay was brought on board to design the Indigenous Commons and Gathering Circle through extensive consultations with Indigenous stakeholders and the college. A sloping, north-facing green roof next to the Indigenous Commons gather- ing space, complete with an array of native plants, was part of the design. The roofing project consisted of three distinctly different systems and roof areas. The barrel-vaulted roof with nail-laminated timber deck re- quired the installation of 18,600 square feet of a mechanically fastened 60mil felt-backed PVC roofing system. The penthouses and mechanical areas consisted of 7,500 square feet of a conventional two-ply SBS modi- fied bitumen assembly. And the 5,300-square-foot green roof area was roofed with a conventional two-ply SBS modified bitumen membrane over a sloping steel compos- ite deck topped with 75mm of concrete. The sloping roof was then topped with a 150mm deep pre-vegetated modular green roof system. The most challenging aspect of the project was the location of the building site, at the heart of the third largest educational institution in Ottawa. Algonquin College’s Woodroffe Campus has a little over 18,000 full-time stu- dents and almost 2,000 full-time staff on campus throughout the year in addition to numerous continuing education students. The area immediately adjacent to the building site contains the registration and administrative of- fices of the college and receives a lot of daily vehicle and, especial- ly, foot traffic. In this high traffic area, PCL Constructors and their subcontractors spent the better part of three years constructing the new building additions and the adjoining commons. The close proximity of the students and college staff, and the limited space for staging on site, required careful project and safety man- agement for the contractor and subcontractors and their suppliers to ensure a safe and expeditious building schedule. Deliveries and subsequent hoisting operations had to be coordinated for specific times of the day to ensure that none of the campus’ thorough- fares were closed and students and faculty activities were not compromised. In order to ensure a high suc- cess rate with the plantings of the green roof and to make an already challenging installation By Kees Govers First installation day: The crane can only reach the first 30 feet of the green roof to land the racks. Installation of the modules is progressing as per design. Installing a design is similar to installing tapered insulation.