Designation:F2678−10StandardPracticeforPreparingPanelUnderlayments,ThickPouredGypsumConcreteUnderlayments,ThickPouredLightweightCellularConcreteUnderlayments,andConcreteSubfloorswithUnderlaymentPatchingCompoundstoReceiveResilientFlooring1ThisstandardisissuedunderthefixeddesignationF2678;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thispracticeincludesrecommendationsforpreparingandsmoothingpanelunderlayments,gypsumconcreteandconcretesubfloorswithpatchingcompoundsuponwhichresilientflooringmaybeinstalled.1.2Thispracticedoesnotcovertheadequacyofthesubfloorassemblytoperformitsstructuralrequirements,whichisgovernedbylocalbuildingcodes.1.3Thispracticedoesnotsupersedeinanymannertheresilientflooring,underlaymentoradhesivemanufacturer’swritteninstructions.Consulttheindividualresilientflooring,underlaymentoradhesivemanufacturerforspecificrecom-mendations.1.4Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.5Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappro-priatesafetyandhealthpracticesanddeterminetheapplica-bilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2C109/C109MTestMethodforCompressiveStrengthofHydraulicCementMortars(Using2-in.or[50-mm]CubeSpecimens)C472TestMethodsforPhysicalTestingofGypsum,Gyp-sumPlastersandGypsumConcreteF141TerminologyRelatingtoResilientFloorCoveringsF710PracticeforPreparingConcreteFloorstoReceiveResilientFlooringF1482PracticeforInstallationandPreparationofPanelTypeUnderlaymentstoReceiveResilientFlooringF2419PracticeforInstallationofThickPouredGypsumConcreteUnderlaymentsandPre...
