Designation:D7851−17StandardGuideforDesignofSustainable,Low-SlopeRoofingSystems1ThisstandardisissuedunderthefixeddesignationD7851;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideprovidesguidanceandconsiderationsrelatedtodesigningsustainablelow-slopedroofingsystems,includingexposedmembraneroofs,membranescoveredwithvegetative(green)overburdensystems,ballastedroofs,andprotectedmembraneroofingassemblies.Asustainableroofingsystemminimizesenvironmentalimpact,conservesenergy,andhasmaximizedservicelife.1.2Theprimarypurposeofaroofingsystemistoweather-proofthebuilding’stopsurface.Implementingasustainableroofingsystemistheintentofthisguide.1.3Thisguideacknowledgesthatmanyfactorsoutsidethedesigner’scontrolaffectthelongevityofaroofingsystem.Thedesignermayrelyonindustryliterature(X1.1)andpersonalexperiencewithroofingsystemstoestimatethedesignlife.1.4Thepremiseofthisguideistofocusattentiononenvironmentalandotherfactorsthatmayaffecttheroofingsystemoveritsservicelife.Byconsideringthesefactorsandincorporatingintotheroofingsystemdesigncertainfeaturesthatmitigatethesefactorsandtheirpotentialadverseeffectsontheroofingsystem,theroofingsystemwouldbeexpectedtohavealongerservicelife.1.5ThisguideincludesmaterialsusedinroofingsystemsunderjurisdictionofASTMCommitteeD08onRoofingandWaterproofing.Theapplicabilityofthisguidetoothersystemsandmaterialshasnotbeendetermined.1.6Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D1079TerminologyRelatingtoRoofingandWaterproofing3.Terminology3.1General—TermsusedinthisguidearedefinedinTerminologyD1079,e...
