ASTM_C_843_-_17.pdf

Designation:C84317Standard Specification forApplication of Gypsum Veneer Plaster1This standard is issued under the fixed designation C843;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 forand methods of applying gypsum veneer plaster.1.2 Where a specific degree of fire resistance is required forveneer plaster systems,applicable building code regulationsshall be followed.1.2.1 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.1.3 Where a specific degree of sound control is required forveneer plaster assemblies and constructions,details of con-struction shall be in compliance with official reports of testsconducted in recognized sound testing laboratories in accor-dance with the applicable sound tests of Test Methods E90,C423,or E492.NOTE1To ensure desirable results,coordinate this specification withSpecification C844.NOTE2General information regarding matters of a contractual natureconcerning veneer plaster work is found in Appendix X1.Additionaltechnical information related to veneer plastering is provided in AppendixX2.1.4 The values stated in inch-pound units are to be regardedas the standard.The values given in parentheses are forinformation only.1.5 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.1.6 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 SystemsC423 Test Method for SoundAbsorption and SoundAbsorp-tion Coefficients by the Reverberation Room MethodC587 Specification for Gypsum Veneer PlasterC588/C588M Specification for Gypsum Base for VeneerPlasters(Withdrawn 2005)3C631 Specification for Bonding Compounds for InteriorGypsum PlasteringC844 Specification for Application of Gypsum Base toReceive Gypsum Veneer PlasterC1047 Specification for Accessories for Gypsum Wallboardand Gypsum Veneer BaseE90 Test Method for Laboratory Measurement of AirborneSound Transmission Loss of Building Partitions andElementsE492 Test Method for Laboratory Measurement of ImpactSound Transmission Through Floor-Ceiling AssembliesUsing the Tapping Machine3.Terminology3.1 Definitions:3.1.1 See Terminology C11.3.2 Definitions of Terms Specific to This Standard:3.2.1 base coat,nveneer plaster trowel or machine ap-plied as the first coat of a two-component system.3.2.2 finish coat,nveneer finish plaster trowel or machineapplied as the second coat over the base coat plaster in atwo-component system.3.2.2.1 smooth-trowel finish,na finish resulting from steeltroweling with a minimum of water after the plaster has1This 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 May 1,2017.Published May 2017.Originallyapproved in 1976.Last previous edition approved in 2012 as C843 99(2012).DOI:10.1520/C0843-17.2For 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.3The last approved version of this historical standard is referenced onwww.astm.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 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 become firm.A smooth finish free of trowel marks,blemishes,or other imperfections.3.2.2.2 texture finish,na finish resulting from(1)trowelapplication followed by floating or texturing of the surface withany of a variety of tools using