b'RESILIENCYrated from each other, and it will limitandtoavoidpotentialdisaster,anyA resilient roof design will also antic-the number of details so there are fewerdesign for a new building should keepipaterenewalatperimeterdetailing. pointsofpotentialdamageorfailure.electrical service lines and junctions outMembranesatperimetersmustbe For example, consider clustering pene- of and away from the roof assembly (seeadhered to their substratea require-trations in a common curb and limitingmy article on this subject in the fall 2022mentinanyofRCABCsmembrane the number of penetrations exposed toissue of Roofing BC). RCABC standardssystemstandards.Inconventional weatherbydesigningpenetrationexitsrequireaclearseparationbetweentheapproaches,thismeansadheringthe throughahorizontalhood.Similarly,two. Those requirements are there formembranetoaninsulationoverlay, rooftopmechanicalunitscanbeclus- the safety and security of owners, occu- which is often mechanically fastened to teredtogetheronlargerpads.Even enclosing mechanical equipment insidepants and roofing contractors for as longthe wall or adhered to the insulation it a separate covered penthouse can elim- as the roof remains serviceable. protects. However, during roof renewal, inatedetailsandpromoteincreased longevity.Youmayalsofindthatby doing that, mechanical systems are less prone to leakage and may last longer as they are kept out of the weather.RENEWABLE BY DESIGNAssumingtheroofisconstructed underareputablequalityassurance (QA)programlikeRoofStar,aroof system should remain dry and (all things properlyconsidered)thermallystable throughout its service life because, if you are designing it using RCABC standards, the insulation system will be multi-lay-eredwithminimalthermalbridging, even at curbs and roof perimeters. 11Nevertheless,roofrenewalisan inevitability, and every roof should be designed for eventual renewal. Designing for renewal has implications for every-thing from primary material choices to how to show the intersection in draw-ings. When you design for renewal, you are building for resilience.Replacingorrecoveringasheet membraneispossibleandshouldbe considered when the rest of the roof systemisdryandcompletelyservice-able.Eitheroptioncangreatlyreduce waste and maintain the integrity of theroof system. Regardlessofeitherapproach, themostsecurewaytohandlethese renewalsisbymechanicallyfasteningRoof Consulting Servicesa cover board (at RCABC, we do not permitcoatingsinourRoofStarQA GuaranteeProgram).Fastenersallow new materials to be secured to the roof deck and do not rely on old and possiblyThird Party Rooftop Quality Assurance Project Management & AdministrationSubstrate Structural Testing Asbestos Testingage-compromisedadhesivelinksAdhesion & Fastener Testing Plaza Decks & ParkadesRoof Condition AssessmentRoof Anchor Design & Testingbetween existing materials. But fastenersRoong Design & Sepcications Green Roofs & Photovoltaicneed clear, unobstructed access to the604.295.8070ircgroup.comdeck. To ensure the roof is future-ready, www.rcabc.orgl29'