Designation:D3679−21AnAmericanNationalStandardStandardSpecificationforRigidPoly(VinylChloride)(PVC)Siding1ThisstandardisissuedunderthefixeddesignationD3679;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationestablishesrequirementsandtestmethodsforthematerials,dimensions,warp,shrinkage,impactstrength,expansion,appearance,andwindloadresistanceofextrudedsingle-wallsidingmanufacturedfromrigid(unplas-ticized)PVCcompound.Methodsofindicatingcompliancewiththisspecificationarealsoprovided.1.2TheusePVCrecycledplasticinthisproductshallbeinaccordancewiththerequirementsinSection4.1.3Rigid(unplasticized)PVCsoffitiscoveredinSpecifi-cationD4477.1.4SidingproducedtothisspecificationshallbeinstalledinaccordancewithPracticeD4756.Referenceshallalsobemadetothemanufacturer’sinstallationinstructionsforthespecificproducttobeinstalled.NOTE1—Informationwithregardtosidingmaintenanceshallbeobtainedfromthemanufacturer.1.5Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.1.6Thefollowingprecautionarycaveatpertainstothetestmethodportiononly,Section6,ofthisspecification:Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafety,health,andenvironmentalpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.NOTE2—ThereisnoknownISOequivalenttothisstandard.1.7Thisinternationalstandardwasdevelopedinaccor-dancewithinternationallyrecognizedprinciplesonstandard-izationestablishedintheDecisiononPrinciplesfortheDevelopmentofInternationalStandards,GuidesandRecom-mendationsissuedbytheWorldTradeOrganizationTechnicalBarrierstoTrade(TBT)...
