Designation:C1177/C1177M−13StandardSpecificationforGlassMatGypsumSubstrateforUseasSheathing1ThisstandardisissuedunderthefixeddesignationC1177/C1177M;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thisspecificationcoversglassmatgypsumsubstrate,whichisdesignedtobeusedasanexteriorsubstrateforaweatherbarrier.1.2ThevaluesstatedineitherSIunitsorinch-poundunitsaretoberegardedseparatelyasstandard.Withinthetext,theSIunitsareshowninbrackets.Thevaluesstatedineachsystemmaynotbeexactequivalents;therefore,eachsystemshallbeusedindependentlyoftheother.Combiningvaluesfromthetwosystemsmayresultinnon-conformancewiththestandard.1.3Thetextofthisstandardreferencesnotesandfootnotesthatprovideexplanatorymaterial.Thesenotesandfootnotes(excludingthoseintablesandfigures)shallnotbeconsideredasrequirementsofthestandard.2.ReferencedDocuments2.1ASTMStandards:2C11TerminologyRelatingtoGypsumandRelatedBuildingMaterialsandSystemsC22SpecificationforGypsumC473TestMethodsforPhysicalTestingofGypsumPanelProductsC645SpecificationforNonstructuralSteelFramingMem-bersC1264SpecificationforSampling,Inspection,Rejection,Certification,Packaging,Marking,Shipping,Handling,andStorageofGypsumPanelProductsE119TestMethodsforFireTestsofBuildingConstructionandMaterials3.Terminology3.1DefinitionsshallbeinaccordancewithTerminologyC11.3.2DefinitionsofTermsSpecifictoThisStandard:3.2.1glassmat,n—amatofglassfiberswithorwithoutabinder.3.2.2edge,n—theboundedgeasmanufactured.3.2.3weatherbarrier,n—amaterialthatpreventsthepas-sageofrain,sleetandsnow.4.MaterialsandManufacture4.1GlassMatGypsumSubstrateshallconsistofanoncom-bustiblewater-resistantcore,essentiallygypsumcomplyingwithSpecificationC22,surfacedwithglassmatpartially,orcompletelyembeddedinthecore.4.2GlassMatGypsumSubstrate,typeX(specialfire-resistant)...
