b'Figure 3: Exploratory opening investigation conducted post-failure. Figure 4: Removal of failed roof for repair. Figure 5: Installation of a roof assembly specimen.theissuesnotedherein,refertoproperly stored and proper pre-the article by Ramachandran et al.,cautions taken at the time of in-Wind Uplift Failure of a Roof As- stallation to ensure the effective sembly: The Perfect Storm. 6 functioning of the components. For installation of assemblies dur-Meeting Codeingwinter,thosecomponents Requirements for Windthat are affected by cold weather Uplift conditions, a winter-grade prod-Tosatisfycoderequirementsuctasofferedbythemanufac-forwinduplift,designersmustturer is to be used. Additionally, first calculate and/or use the avail- crews must pay attention to de-able online calculator to determinetails at the time of construction, theproject-specificwindupliftsuch as temporary seals at perim-valuesandincludethemintheeter scuppers and openings, and project specifications. In addition,along end of workday assembly it is advisable for the designer toterminations, to avoid loss of in-specify a requirement for the con- tegrity of the roof assembly due tractortosubmitreportsissuedto inclement weather including by third-party testing laboratoriesextreme weather conditions that to confirm that the procured roofmayoccurduringinstallation. assemblies are rated to exceed theQualitycontrolmeasuresby required project-specific wind up- the general contractor and roof-lift values. If the designer choosesing trades are essential to verify to include basis-of-design roof as- that materials and components sembliesinthespecification,theare properly installed. A general designermaychoosetoresearchconformance review by the de-and/orworkwithmanufacturerssigner and a qualified consultant toidentifyratedroofassembliesasrequiredisimperativedur-thatmeettheproject-specificre- ingconstruction.quirements.SomemanufacturersCalculating Project-andthird-partytestinglaborato- Specific Wind Uplift rieshavepostedonlinetheroof assemblyresistancereportswithRequirementstheir ratings that can help the de- Theproject-specificwind signeridentifyappropriateroofuplift load values are calculated assemblies. NRC is in the processbasedonload-resistance-factor of developing a portal with a data- design(LRFD)withinputs base of tested roof assemblies fromincludingthegeographicallo-various manufacturers to providecation,terrainoftheproject a centralized resource. At the timesite,openingsinthebuilding, of the roof assembly procurement,heightofthebuilding,sizeof theroofingcontractorcanworkthe roof area and height of the with manufacturers to identify aparapet.NRChasdeveloped roof assembly that is rated to re- andpublishedanonlinetool, sist the project-specific wind upliftWind-RCI, 7 thatcancalculate load requirements of all zones atthese values based on the users each of the roof areas of the build- project-specific input. This tool ing, and present as a substitutioncan be used to calculate the re-request for designers approval.quired size or width and corre-While the selection of a ratedsponding wind uplift resistance roof assembly is an important step,valuesforfield,perimeterand the general contractor and roofingcorner zones of each roof area, trade must take responsibility foras required, based on the build-goodworkmanshipandthecor- ing information and site location rectinstallationoftheselectedcharacteristics.Theonlinetool system. It is critical to follow thehas limitations: it is not applica-manufacturersinstructionsforble to buildings exceeding 45 m the tested assembly, including the(150 ft.) in height, and it should use of proper spacing, patterns andbe cautiously used for buildings installation timing for each of thelocatedindensemetropolitan components.Materialsmustbelocationswheremicroclimatic ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 3 202515'