b'EXTREME WEATHERCanada were analyzed for hourly fluctu-ations. The data available for these loca-tions spanned 10 to 20 years, with the majority of the locations having 15 years of data available. A threshold value of 5C was chosen to identify the instances ofhourlyfluctuationsabovethe threshold. The number of these cycles per year obtained from the time series were fit to a Poisson distribution (prob-abilityofexceedanceistwopercent) andthenumberofcyclesfor50-year return periods were determined. For the analyses, the period from May to August wasconsideredsummer,duringwhich a hot weather shock would occur, and December to March was winter, during which a cold weather shock would occur. The above is summarized in Figure 2. Thehotandcoldweathershock valuesareinitiallyobtainedbasedon airtemperature.Thesurfacetempera-ture that a roof component will reflect underaspecificairtemperaturewill differ based on the component and its position within the system. Thats why establishingtherelationshipbetween thecomponenttemperatureandairtemperature is required. Figure 2: Weather shock framework summary. Thereafter, the hot and cold weather shock that the component will be expe- riencinginascenarioof2Cglobal shock parameters and incorporate themtical application was discussed with thewarmingmagnitudeisdetermined. into testing methodologies is critical inindustry.Basedonthediscussions,aThis framework can be followed for all establishing durability characteristics. framework was developed using futurebuildingenvelopecomponentsandis climatic loads and how to incorporatenot limited to roof components. As well, FRAMEWORK DEVELOPMENTthemintotheexperimentalmethod- theparameterscanbeestablishedfor Howtoquantifytheweathershocksology. Initially, hourly temperature timeother global warming magnitude ranges that will occur in the future for prac- series available for 564 locations acrossfrom 0.5C to 3.5C.Bothwell-Accurate has enjoyed 90 successful years in business and now employs over 500 professionals to meet all your waterproofing, architectural metal and roofing project requirements. With a management team that represents some ofthe most experienced professionals in the industry, and more than 60,000completedprojects,weareoneofCanadasoldestandmostexperienced construction firms. We proudly service our growing roster of industrial, commercial and institutional clients providing innovative, superior installations in the lower mainland and interior of British Columbia and across Ontario.604-282-7960bcestimating@bothwell-accurate.combothwell-accurate.com18 lROOFINGBClSUMMER 2023'