Designation:E2788−11StandardSpecificationforUseofExpandedShale,ClayandSlate(ESCS)asaMineralComponentintheGrowingMediaandtheDrainageLayerforVegetative(Green)RoofSystems1ThisstandardisissuedunderthefixeddesignationE2788;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationcoversthequalityandgradingofthefollowingmaterialsforuseasamineralcomponentofgrowingmediaanddrainagelayerforextensiveandintensivevegetative(green)roofsystems.Therequirementsareintendedtocoveronlymaterialshavingnormaloraveragegradationcharacter-istics.Procedurescoveredinthisspecificationarenotintendedforevaluatingtheperformancenutrientsassociatedwithveg-etative(green)roofgrowingmediaWhereothermaterialsaretobeused,appropriatelimitssuitabletotheirusemustbespecified.1.2ThevaluesstatedinSIunitsaretoberegardedasstandard.Thevaluesgiveninparenthesesaremathematicalconversionstoinch-poundunitsthatareprovidedforinforma-tiononlyandarenotconsideredstandard.1.3Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.1.4Thisstandardoffersanorganizedcollectionofinforma-tionoraseriesofoptionsanddoesnotrecommendaspecificcourseofaction.Thisdocumentcannotreplaceeducationorexperienceandshouldbeusedinconjunctionwithprofessionaljudgment.Notallaspectsofthisguidemaybeapplicableinallcircumstances.ThisASTMstandardisnotintendedtorepre-sentorreplacethestandardofcarebywhichtheadequacyofagivenprofessionalservicemustbejudged,norshouldthisdocumentbeappliedwithoutconsiderationofaproject’smanyuniqueaspects.Theword"Standard"inthetitleofthisdocumentmeansonlythatthedocumenthasbeenapprovedthroughtheASTMconsensusprocess.2.Referenc...
