Designation:D4601/D4601M−04(Reapproved2012)´1StandardSpecificationforAsphalt-CoatedGlassFiberBaseSheetUsedinRoofing1ThisstandardisissuedunderthefixeddesignationD4601/D4601M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheDepartmentofDefense.´1NOTE—UnitsinformationwaseditoriallycorrectedinJune2012.1.Scope1.1Thisspecificationcoversasphaltimpregnatedandcoatedglassfiberbasesheet,withorwithoutperforations,foruseasthefirstplyofthebuilt-uproofing.Whennotperforated,thissheetissuitableforuseasavaporretarder,withasolidmoppingofasphalticmaterial,underroofinsulationorbe-tweenmultiplelayersofroofinsulation.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.2.ReferencedDocuments2.1ASTMStandards:2D146TestMethodsforSamplingandTestingBitumen-SaturatedFeltsandWovenFabricsforRoofingandWaterproofingD228TestMethodsforSampling,Testing,andAnalysisofAsphaltRollRoofing,CapSheets,andShinglesUsedinRoofingandWaterproofingD1079TerminologyRelatingtoRoofingandWaterproofing3.Terminology3.1Definitions—Fordefinitionsoftermsusedinthisspeci-fication,refertoTerminologyD1079.4.Classification4.1Asphaltimpregnatedandcoatedglassfiberbasesheet,TypeIandTypeII,arecoveredbythisspecification.5.MaterialsandManufacture5.1Thematshallbeathin,porousmatofuniformlydistributedglassfibers,withorwithoutadditionalreinforcingstrandsofglassyarn,andbondedwithawater-resistantresinousbinder.5.2Intheprocessofmanufacture,asinglethicknessofglassfibermatshallbeimpregnatedwithhotasphalt,coatedononeorbothsideswithahotasphalticmaterial,andpermittedtobesurfacedwi...
