ASTM_C_840_-_17.pdf

Designation:C84017Standard Specification forApplication and Finishing of Gypsum Board1This standard is issued under the fixed designation C840;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.Scope*1.1 This specification covers the minimum requirements forthe methods of application and finishing of gypsum board,including related items and accessories.1.2 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.1.2.1 Where this specification is more stringent(size orthickness of framing:size and spacing of fasteners)than thefire-rated construction,this specification shall govern.1.3 Where sound control is required for a gypsum boardassembly,details of construction shall be in accordance withreports of acoustical tests of assemblies that have met therequired acoustical values.1.4 Unheated spaces above gypsum board ceilings shall beproperly ventilated(see Appendix X2).1.5 The various application systems are located in thefollowing sections:IApplication of Single-ply Gypsum Board to WoodFramingMembers8IIApplication of Two-ply Gypsum Board to WoodFramingMembers9IIIApplication of Gypsum Board by Adhesive Nail-on toWood Framing Members10IVSemi-solid Gypsum Board Partitions11VSolid Gypsum Board Partitions12VIApplication of Gypsum Board with Adhesives to InteriorMasonry or Concrete Walls13VIIApplication of Gypsum Board to Rigid Foam Insulation14VIIIApplication of Gypsum Board to Steel Framing andFurring15IXArches and Bending Radii16XApplication of Gypsum Board to Receive Tile byAdhesive Application17XIExterior Application of Gypsum Wallboard andExterior Gypsum Soffit Board18XIIFloating Interior Angles19XIIIControl(Expansion)Joints20XIVFoil-backed Gypsum Board21XVApplication of Vinyl Faced Gypsum Board221.6 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.1.7 The text of this specification references notes andfootnotes which provide explanatory material.These notes andfootnotes(excluding those in tables and figures)shall not beconsidered as requirements of the specification.1.8 The following precautionary caveat pertains only toSections 6 25.This standard does not purport to address allof the safety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.8.1 For specific precautionary statements,see 4.1.1,4.1.2,and 23.5.1.9 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C11 Terminology Relating to Gypsum and Related BuildingMaterials and SystemsC475/C475M Specification for Joint Compound and JointTape for Finishing Gypsum Board1This 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 April 1,2017.Published April 2017.Originallyapproved in 1979.Last previous edition approved in 2013 as C840 16.DOI:10.1520/C0840-17.2For 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.*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 StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 C514 Specification for Nails for the Application of GypsumBoardC557 Specification for Adhesives for Fastening GypsumWallboard to Wood FramingC645 Specification for Nonstructural Steel Framing Mem-bersC754 Specification for Installation of Steel Framing Mem-bers to Receive Sc