Designation:E2397/E2397M−19StandardPracticeforDeterminationofDeadLoadsandLiveLoadsAssociatedwithVegetative(Green)RoofSystems1ThisstandardisissuedunderthefixeddesignationE2397/E2397M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticecoversastandardizedprocedureforpre-dictingthesystemweightofavegetative(green)roofsystem.1.2Thepracticeaddressestheloadsassociatedwithvegeta-tive(green)roofsystems.Componentsthataretypicallyencounteredinvegetative(green)roofsystemsinclude:membranes,non-absorptiveplasticsheetcomponents,metalliclayers,fabrics,geocompositedrainlayers,syntheticreinforc-inglayers,cover/recoverboards,insulationmaterials,growthmedia,granulardrainagemedia,andplantmaterials.1.3Thispracticealsoaddressestheweightofthevegetative(green)roofsystemundertwoconditions:(1)weightunderdrainedconditionsafternewwateradditionsbyrainfallorirrigationhaveceased(thisincludestheweightofretainedwaterandcapturedwater),and(2)weightwhenrainfallorirrigationisactivelyoccurringandthedrainlayeriscompletelyfilledwithwater.Thefirstconditionisconsideredthedeadloadofthevegetative(green)roofsystem.Thedifferenceinweightbetweenthefirstandsecondconditions,approximatedbytheweightoftransientwaterinthedrainlayer,isconsideredaliveload.1.4Thispracticedoesnotaddresspointorlineloadsassociatedwitharchitecturalelementsthatarenotessentialcomponentsofaparticularvegetative(green)roofsystem.Thesearchitecturalelementsmayincludepavement,walls,andmasonry,andsoforth.1.5Thispracticedoesnotaddressliveloadsassociatedwithconstructionactivities.1.6Thispracticedoesnotaddressloadsassociatedwithsnoworwind.1.7ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother....
