Designation:C847−14aStandardSpecificationforMetalLath1ThisstandardisissuedunderthefixeddesignationC847;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.ThisstandardhasbeenapprovedforusebyagenciesoftheU.S.DepartmentofDefense.1.Scope*1.1Thisspecificationcoverssheetlath,expandedmetallath,diamondmesh,flatandself-furring,andribmetallath,1⁄8and3⁄8in.(3.2and9.6mm),allwithorwithoutbackinganddesignedtobeusedasabaseforgypsumorportlandcementplaster.1.2Thevaluesstatedininch-poundunitsaretoberegardedasstandard.ThevaluesgiveninparenthesesaremathematicalconversionstoSIunitsthatareprovidedforinformationonlyandarenotconsideredstandard.2.ReferencedDocuments2.1ASTMStandards:2A653/A653MSpecificationforSteelSheet,Zinc-Coated(Galvanized)orZinc-IronAlloy-Coated(Galvannealed)bytheHot-DipProcess3.Material3.1Metallathshallbefabricatedfromcold-rolledcarbonsteelsheetofcommercialqualityconformingtoSpecificationA653/A653M.GalvanizedmetallathshallhaveaG60coatinginaccordancewithSpecificationA653/A653M.3.2Backingshallbeattachedtothelathsufficientlyenoughtopreventaccidentalremovalduringshipping,handling,orinstallation.Attachmentofbackingshallalsoallowlappingofmetaltometalandbackingtobacking,1in.(25.4mm)ontheendsand1⁄2in.(12.7mm)onthesides.4.Dimensions,Mass,andPermissibleVariations4.1Thickness—Thenominalthicknessofdiamondmeshandflatribmetallathshallbe1⁄8in.(3.2mm).Thenominalthicknessofotherribmetallathshallbeasdesignated,3⁄8in.(9.6mm).Thenominalthicknessofself-furringdiamondmeshshallbe5⁄16in.(7.9mm).4.2Width—Theminimumwidthofmetallathshallbe27in.(686mm).4.3Length—Theminimumlengthofmetallathshallbe97in.(2464mm).4.4Weight—Theweightofmetallathshallbeasfollows:4.4.1U.S.Weights:Type:Weight,lb/yd2(kg/m2)Diamondmesh2.5(1.4);3.4(1.8)Flatrib1.8(1.0);2.75(1.5);3.4(1.8)3⁄8-in.rib3.4(1.8);4.0(...
