b'GREEN ROOFINGa RoofStar Guarantee. While we know(NRCA). We are grateful for this worktowarrantythroughasingle-source ourstandardsareusedorreferencedby others, and we readily acknowledgewarranty agreement.outside of our guarantee program, wetheirpioneeringeffortstomakeourEveryvegetatedroofsystemthe make it plain to every reader in Divisionundertaking possible. RGC will accept in this unique program AoftheRoofingPracticesManualmustbefullywarrantiedbytheasso-(RPM) that they do so at their own risk. AcceptedMaterials:Likethelimita- ciate member and must (at minimum) Justlikeanyofourotherstan- tions of our standards, RCABC limitsbecomprisedofarootbarriermate-dards, the Standard for Vegetated Roofwhichmaterialsmaybeincorporatedrial, drainage courses, filtration courses, Assembliesiswrittenspecificallytoin a project that is designed and builtwater retention materials, growing media supporttheRGCRoofStarGuaranteetoqualifyforourguarantee.Those(engineered soil), vegetation and a means program. It is not a how-to document;materialsareacceptedbytheRGCof restraining the vegetated roof system rather, the standard presumes the readerand listed in Division C of the RPM.against displacement (by wind, gravity, possesses a competent level of knowl- Acceptance does not mean endorsedwater, etc.). The RGC will not allow an edgeandunderstandingaboutgreenor that these materials are the best in la carte approach to vegetated roof roofing.Thestandardisalsowrittenthemarketplace.Itsimplymeansthatsystem design. This ensures control over todovetailwithotherstandardsinthe RGC can count on those materialsthequalityandfunctionalityofeach the RPM. to perform in expected ways, and thatmajor constituent component of a vege-associatememberswhomanufacturetated roof system, thereby reducing risk.OurStandardforVegetatedRooforprivatelylabelthemstandbehind Assembliesbuildsontheground- their products. Membership: Membership really means workalreadylaidbymanywhohaveTo deliver a RoofStar Guarantee forrelationship, and this includes the rela-pressedonbeforeus,includingthevegetatedroofassemblies,onlyvege- tionships the RCABC has with its active GermanLandscapeDevelopmentandtated roof systems offered by RCABCmembers(roofingcontractors),asso-LandscapingResearchSocietye.V.associatemembers(membranemanu- ciate members and affiliate members. In (FLL), Green Roofs for Healthy Cities,facturers)willbepermitted.Thiswilla similar way that a RoofStar Guarantee ANSI/SPRI,ASTMandtheNationalincludesystemsbyaffiliatemembersfor roof systems rests on membership, a RoofingContractorsAssociationthatassociatemembersarewillingRoofStar Guarantee for vegetated roof 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 lROOFINGBClSPRING 2024'