b'TechnologyNature-Based Solutions on Commercial RoofsHow they can mitigate urban flooding By Zahra Jandaghian and Bas BaskaranThefollowingarticleoriginallymunicipalities,buildingowners, appearedintheFall/Winter2022insurersandotherstakeholdersto issueofRoofingCanadamagazineusethevastunusedsurfaceof andisreprintedwithpermissioncommercial roofs in the dense urban from the Canadian Roofing Contrac- canopytomitigatetheadverse tors Association.impacts of urban flooding. In some I ncidentsoffloodingarerisingmunicipalities, roof cover accounts duetoclimaticchangesacrossfor approximately 30 to 50 per cent Canada,causingbillionsofof surfaces.dollars of damage to buildings andLow-slopedroofscanbe urban infrastructure, as well as lossequippedwithinnovativenature-of life and property. Previously, thebasedsolutions(NBS)tomanage focusofstormwatermanagementstormwater.NBSoncommercial was on urban infrastructure and theroofs (NBSCR) are a Vegetated urbanseweragesystem.However,RoofingAssembly(VRA),known there is now growing interest fromas a green roof, and/or a Stormwa-Commercial and Residential RoofingTrinity Roofing Ltd. specializes in a variety of roofing applications andwaterproofing for residential, commercial and institutional buildings.Phone: 416-630-9213URL: www.trinitycanada.com Fax: 416-630-1722 Email: info@trinitycanada.comFigure 1: NBSCR: (A) Vegetated Roofing Assembly (VRA), (B) Stormwater Detention Assembly (SDA).8ONTARIO ROOFING NEWSISSUE 4 2022/23 THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ORN'