ASTM_C_841_-_03_2013.pdf

Designation:C84103(Reapproved 2013)Standard Specification forInstallation of Interior Lathing and Furring1This standard is issued under the fixed designation C841;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers the minimum requirements for,and the methods of application of,interior lathing and furringto receive gypsum plaster applied in accordance with Specifi-cation C842.Other materials are not prohibited from beingused provided that their physical characteristics and durabilityunder conditions of usage are at least equal in performance tothose described.1.2 The values stated in inch-pound units are to be regardedas standard.The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.3 Details of construction for a specific assembly toachieve the required fire resistance shall be obtained fromreports of fire-resistance tests,engineering evaluations,orlistings from recognized fire testing laboratories.1.4 Where a specific degree of sound control is required forplastered assemblies and constructions,details of constructionshall be obtained from reports of sound tests of assemblies thathave met the requirements of Test Method E492.2.Referenced Documents2.1 ASTM Standards:2A641/A641M Specification for ZincCoated(Galvanized)Carbon Steel WireC11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC37/C37M Specification for Gypsum Lath(Withdrawn2004)3C514 Specification for Nails for the Application of GypsumBoardC754 Specification for Installation of Steel Framing Mem-bers to Receive Screw-Attached Gypsum Panel ProductsC842 Specification for Application of Interior Gypsum Plas-terC847 Specification for Metal LathC933 Specification for Welded Wire LathC954 Specification for Steel Drill Screws for theApplicationof Gypsum Panel Products or Metal Plaster Bases to SteelStuds from 0.033 in.(0.84 mm)to 0.112 in.(2.84 mm)inThicknessC1002 Specification for Steel Self-Piercing Tapping Screwsfor Application of Gypsum Panel Products or MetalPlaster Bases to Wood Studs or Steel StudsC1007 Specification for Installation of Load Bearing(Trans-verse and Axial)Steel Studs and Related AccessoriesC1032 Specification for Woven Wire Plaster BaseD1784 Specification for Rigid Poly(Vinyl Chloride)(PVC)Compounds and Chlorinated Poly(Vinyl Chloride)(CPVC)CompoundsD3678 Specification for Rigid Poly(Vinyl Chloride)(PVC)Interior-Profile ExtrusionsE492 Test Method for Laboratory Measurement of ImpactSound Transmission Through Floor-Ceiling AssembliesUsing the Tapping Machine2.2 National Association of Architectural Metal Manufac-turers StandardHMMA 840 Installation and Storage of Hollow Metal Doorsand Frames43.Terminology3.1 DefinitionsFor definitions relating to ceilings andwalls see Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 base coat,nthe sum of the scratch and brown coatsor the total coats in place prior to application of finish coats.1This specification is under the jurisdiction of ASTM Committee C11 onGypsum and Related Building Materials and Systems and is the direct responsibilityof Subcommittee C11.03 on Specifications for theApplication of Gypsum and OtherProducts in Assemblies.Current edition approved Oct.1,2013.Published October 2013.Originallyapproved in 1976.Last previous edition approved in 2008 as C841 03(2008)1.DOI:10.1520/C0841-03R13.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.4Available from National Association of Architectural Metal Manufacturers(NAAMM),800 Roosevelt Road,Bldg.C,Suite 312,Glen Ellyn,IL 60137,http:/www.naamm.org.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.2 contact ceiling,na ceiling in which the lath isattached in direct contact with the construction above,withoutthe use of main runners or cross furring.3.2.3 furred ceiling,na ceiling in which the furring usedfor the support of the lath is attached directly to the structuralmembers of the building.3.2.4 suspended ceiling,na ceiling in which the mainrunners and cross furring are suspended below the structuralmembers of the building.3.2.5 main runners,nthe members that are attached to orsuspended from the construction above for the support of crossfurring.3.2.6 cro