b'wind uplift resistance values for alllated risks due to their exposurefutureclimateseverities.TheSilverof global warming (0.5C to 3.5C).the user to select a resiliency index of roof zones. to increases and variation in tem- and Gold levels include provisions toBased on these inputs, the tool classi- 1, 2 or 3, wherein the selection of a While it is critical that the de- perature,windstormscausingcountertheimpactsofanticipatedfies the severity of wind, rain and tem- higher resiliency index means the in-signerexerciseprudenceduringwind uplift failures and extendedclimate severities and the level of resil- perature for the buildings location astent to achieve higher roof resilience. thedesignstageandverificationwaterandsnowretention.Ac- ience required for the type of buildingnormal, severe or extreme. Addition- Resiliency index 1 aligns performance attheprocurementstage,thesecording to Engineers Canada: 11 anduse.ally,thetoolprovidesquantitativerequirements with current provisions precautions will not be sufficientEngineers have a significantNRCChasdevelopedanonlinedesign parameters: 1/50 hourly windofNBCC 2 andNECB. 12 Resiliency if the installers on site are not in- role to play in addressing climatetool,Climate-RCI, 13 basedonthepressure and 1/50 one day rain, rep- index 3 is defined as follows: Roof-formedofordonotfollowthechange issues and incorporatinginformationfromEnvironmentandresentinga50-yearmeanrecurrenceing systems are fully functional with sameconfigurationsofassemblythem into engineering practice inClimateChangeCanada.Thistoolforwindandrain,respectively,andrequired performance for normal and securements that were used for theCanada Engineers, under theirallows users to input a buildings loca- anticipated maximum daily tempera- emergency operations irrespective of tested specimen (i.e., if they do notprofessional code of ethics, playtion in Canada and select a magnitudeture for heat. The tool then requirestheclimateconditions.Damageto use the same attachment methodsafundamentalroleinensuring fortheroofassemblylayers).Toconstructionandoperationare ensurethattheconstructedroofcontinuously adapted to the im-assembly meets the code require- pacts of climate change to ensure ments,itisimperativethatthepublic safety.project includes standard of accep-tance or mock-up reviews, generalScope and Applicability conformance reviews and qualityof CSA A123.26assurance inspections.To support the design com-Thewindupliftloadsatthemunity in countering the antici-corneraretypicallyhigherthanpated effects of climate severities, attheedgeandfieldconditions.the Task Group on Climate Re-Therefore, there is technically ansilience of Low Slope Membrane option to install a roof assembly atRoofing Systems developed CSA the field and edge conditions thatA123.26 5 undertheauthority isratedlowerthantheassemblyof the Technical Committee on for the corner conditions. Choos- BituminousRoofingMaterials ing to install varied assemblies atand the Strategic Steering Com-the field, edge and corner will havemitteeonConstructionand cost benefits, particularly on largerCivil Infrastructure. The docu-roofs. Such installations with vary- ment was published in 2021 as a ing performance ratings should benational standard that meets the carefullyevaluatedonacase-by- StandardCouncilofCanadas case basis to verify that the varia- requirements.Theobjectiveof tion will not have a performanceCSA A123.26 5is to outline spe-impact at the transitions betweencific quantitative and qualitative the assembly types. Certain con- requirements in the selection and ditions may apply in projects thatdetailing of low-slope membrane allowdifferentroofassembliesroofing systems to resist the im-for each of the zones; these con- pactsofanticipatedclimatese-ditionsincludemaintainingtheverities. The standard addresses sameroofcompositionforalltwo main elements of the antici- INDEPENDENT. zones in terms of materials, posi- pated climate severities: wind and tioning of layers and thickness of layers;maintainingaconsistentrain. Regarding wind, the pivotalUNBIASED. thicknessforalltheassemblies;requirement for the roofing sys-or using roof area dividers wheretemslong-termperformanceis variations are distinct. resistance to wind loads, whichCOMPREHENSIVE.includesthedeterminationof Projected Climateproject-specific wind uplift loads and the selection of an appropri-Severities ate assembly that can resist the In addition to meeting currentdeterminedload.Additionalwww.dycon.ca|info@dycon.ca|1.800.749.8609code requirements, designers andqualitativerequirementsinthe contractorsalsoneedtounder- standard are in line with the de-standthatfurtherenhancementstermined wind uplift loads. Re-to the way roof assemblies are con- gardingrain,thestandardhas Roof Replacement & Project Management & structedforlong-termdurabilitydesign requirements for the roof- Asphalt Pavement: Design,Work-In-Progress Quality maybenecessarytoprepareforing system to collect, manage and climate-change-driven events suchdispose of anticipated additionalSpecifications, Tendering &Assurance Inspectionsas intense wind storms, heavy pre- rainwater due to climate severi- Contract Administrationcipitation and increased tempera- ties, as well as several qualitative Preventative Maintenance ture. With the Earths current sur- requirements. 5Roof, Building EnvelopeProgramsface temperature already reachingCSA A123.26provides three& Pavement Evaluations: 1.5C warmer than pre-industrialperformance levels for low-slope Rooftop PV Solar levels, the occurrence of severe cli- membraneroofingsystems:Service Life Assessments,Consultations &mate-relatedconditionsisantici- Bronze,SilverandGold.TheCapital Planning &Installation Inspectionspatedimmediatelyandthrough- Bronze level represents the cur- Maintenance Plansout the course of the service livesrentrequirementsincludedin of existing and to-be-built build- theNBCC 2 andNationalEn-Thermographicing stocks. Among building enve- ergy Code of Canada for Build-Roof Leak Management Infrared Analysislope components, roofs tend to beings(NECB), 12 whichdonot especially vulnerable to climate-re- takeintoaccountanticipated ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 3 202517'