b'With the trend towards municipalities requiring building permits for roof replacement work in many jurisdictions, designers are reminded of their obligation to implement current building codes and municipal by-law requirements in the design.of installing membrane and insu- tions and obstacles of roof con-lation continuity can sometimesstruction and the notion that resemble a game of Twister ()what may look good on paper thatrequirescoordinationbe- may not be possible or practi-tween the roofing contractor andcaltoinstall.Weathercondi-representativesofothertradestions,safety,accessibilityand includingmechanical,electri- materiallimitationscouldall cal, plumbing, fenestration, clad- turn what looked like a good dingandinsulationcontractorsdesign idea into an impossibleduring new build constructionor costly endeavour.projects. Roofing contractors are oftenhiredasgeneralcontrac- Modern Roofing tors, subcontracting other tradesPractices and within a roof replacement projectResponsibilitiescontract as the only way to com- Todays roofing contractors plete a roof replacement withouthave, for the most part, adapted risking water infiltration. to the modern ways of roofing. Prior to designing a roof re- They send their crews to proj-placement,itisimportanttoectsiteswithmaterialsafety understandhowtheexistingdata sheets, life safety and res-building has been constructed, in- cue equipment and plans, engi-cluding the type of structure andneered shop drawings for scaf-roofdeck,existingmechanicalfolding and hoarding, building andplumbingsystems,parapetand road closure permits, and andadjacentwallconstruction,taperedinsulationdrawings. rooftop equipment and penetra- Todaysroofingtechnicians tions. It is counterproductive toare trained to install multiple design a roof incompatible withtypes of roof membranes and existing materials or building de- incorporate them with insula-tailing as the connections couldtion in various configurations fail, allowing for air and moistureof roof systems. How they in-infiltration(resultinginenergycorporate their ability to work lossandleaks).Removingwallwithroofingmaterialsinto parapet claddings to ensure con- the entire building envelope is tinuousbarriermembraneandwhere accurate contract docu-insulation transitions, lifting me- mentationandsitereviewof chanical units to complete curbworkinprogressbyadesign detailing and ensuring sufficientprofessional lead to successful drainage capacity and strategy areroof installations.all steps that must be intention- With the trend towards mu-allyandcarefullydetailedandnicipalitiesrequiringbuilding performedtoensuresuccessfulpermitsforroofreplacement roofreplacement. workinmanyjurisdictions, Relyingontheroofingcon- designers are reminded of their tractors technician to bridge theobligationtoimplementcur-transition between adjacent wallrentbuildingcodesandmu-andparapetdetailing,buildingnicipalby-lawrequirements materialsandroofaccessoriesinthedesign.Considerations withoutprofessionaldirectionforstructuralloading,wind opensthepossibilitythattheuplift resistance, roof drainage, technicians installation does notinsulation values and building meet building code and buildingoccupancyhavealwaysbeen science best practices. This is notrequired;however,theyare a slight towards a roofing techni- notoftenaccuratelyanalyzed cians ability but is an emphasisorcalculated.ontheco-operativeapproach betweentheroofingcontractorBalancing Design and and design professional that roof replacement work should follow.PracticalityInturn,thedesignermustbeInrecentyears,increased mindful of the difficulties, limita- demands have also come from ORN THE ONLY SOURCE FOR PROFESSIONAL ICI ROOFING CONTRACTORS IN ONTARIO ONTARIO ROOFING NEWSISSUE 2 202517'