b'EXTREME WEATHERThe evaluation of building envelope componentsWorks Cited[1] Canadian Commission on Building andFire Codes, National Building Code of Canada, Ottawa: National Research Council and systems based on the developed [2]of Canada, 2015. CSA Group, CSA A123.26-21, Performancerequirements for climate resilience of low slope membrane roofing systems, Ottawa: Standards weather shock conditioning is critical and will[3]Council of Canada.B. Baskaran and F. Shyti, "A new climate resilient tool for the commercial roofing help us better understand the durability of[4]community," Interface, pp. 8-16, 2021.Government of Canada, "Wind-RoofCalculators on the Internet (Wind-RCI)," [Online]. Available: https://nrc.canada.ca/en/building components and systems. research-development/products-services/ software-applications/wind-roof- calculators-internet-wind-rci.[5] National Research Council of Canada,Animportantstepforincorpo- components in the laboratory. The eval- https://www.naimacanada.ca/ ratingtheweathershockframeworkuation of building envelope componentscodes-standards. [6] P. Berdahl, H. Akbari, R. Levinson and W. A. into testing is the duration of hot andandsystemsbasedonthedeveloped Miller, "Weathering of Roofing MaterialsAn cold cycles to ensure practicality of theweathershockconditioningiscrit- Overview," Journal of Construction and Building experiments. An example of how thisical and will help us better understandMaterials, Vol. 22, No. 4, pp. 423-433, 2008. canbeachievedisbysettingaprac- thedurabilityofbuildingcomponents[7] I. M. Giammanco, T. M. Brown and H. E.ticaldurationoftheentireweatherSommers, "IBHS Roof Aging Farms2014 shock cycle and adjusting the durationandsystems.ThiscanprovidebetterMeasurement Summary," Insurance Institute of each cycle. This must be achievedin-service performance predictions. for Business and Home Safety, 2015.while ensuring that the total number of fluctuations for hot and cold weather shocks is maintained. An example of a dark-coloured roof covering (asphalt shingle) is shown in Figure4.Thehotandcoldweather shock cycle has a total duration of 15 days. Within each day, there are eight hot and six cold weather shock cycles. Thedurationof15days,alongwith thebreakdownofeighthotandsix cold cycles a day and the duration of each cold and hot cycle, can all change to better reflect the building envelope materialbeingevaluated.Anasphalt shinglewillnotabsorbandretain heat in a similar manner to beige wall siding. Therefore, the factors that must berespectedwhendeterminingthe composition of the cycles are:The cold and hot componentweather shock temperatures, andThe number of weathershock occurrences.CONCLUDING REMARKSThis paper presented a process to incor-poratecurrentandfutureprojected weathershockparametersintothe experimentaltestingofbuildingroof www.rcabc.orgl21'