Designation:D4477−16AnAmericanNationalStandardStandardSpecificationforRigid(Unplasticized)Poly(VinylChloride)(PVC)Soffit1ThisstandardisissuedunderthefixeddesignationD4477;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisspecificationestablishesrequirementsandtestmethodsforthematerials,dimensions,camber,impactstrength,expansion,andappearanceofextrudedsingle-wallsoffitmanufacturedfromrigid(unplasticized)PVCcompound.Methodsofindicatingcompliancewiththisspecificationarealsoprovided.1.2TheuseofPVCrecycledplasticinthisproductshallbeinaccordancewiththerequirementsinSection4.1.3Rigid(unplasticized)poly(vinylchloride)(PVC)sidingiscoveredinSpecificationD3679.1.4SoffitproducedtothisspecificationshallbeinstalledinaccordancewithPracticeD4756.Referenceshallalsobemadetothemanufacturer’sinstallationinstructionsforthespecificproducttobeinstalled.NOTE1—Informationwithregardtosoffitmaintenanceshallbeobtainedfromthemanufacturer.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thefollowingprecautionarycaveatpertainstothetestmethodportiononly,Section6ofthisspecification.Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimita-tionspriortouse.NOTE2—ThereisnoknownISOequivalenttothisstandard.2.ReferencedDocuments2.1ASTMStandards:2D618PracticeforConditioningPlasticsforTestingD635TestMethodforRateofBurningand/orExtentandTimeofBurningofPlasticsinaHorizontalPositionD696TestMethodforCoefficientofLinearThermalExpan-sionofPlasticsBetween−30°Cand30°CwithaVitreousSilicaDilat...
