ASTM C843-23

Standard Specification for Application of Gypsum Veneer Plaster

ABSTRACT
This specification covers the minimum requirements for gypsum veneer plaster and includes application methods on systems such as electric heat cable systems but not exceeding a specified temperature. Applicable building code regulations should be followed when a specific degree of fire resistance is required. Plaster and other cementitious materials should be kept dry until these are ready to be used and should be kept off the ground, under cover, and away from damp walls and surfaces.
SCOPE
1.1 This specification covers the minimum requirements for and methods of applying gypsum veneer plaster.  
1.2 Where a specific degree of fire resistance is required for veneer plaster systems, applicable building code regulations shall be followed.  
1.2.1 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.  
1.3 Where a specific degree of sound control is required for veneer plaster assemblies and constructions, details of construction shall be obtained from reports of acoustical tests of assemblies that have met the required or specified acoustical performance.
Note 1: To ensure desirable results, coordinate this specification with Specification C844.
Note 2: General information regarding matters of a contractual nature concerning veneer plaster work is found in Appendix X1. Additional technical information related to veneer plastering is provided in Appendix X2.  
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information only.  
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.  
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.7 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 28-Feb-2023
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.03 - Specifications for the Application of Gypsum and Other Products in Assemblies

Relations

• Refers: ASTM C631-09(2020) - Standard Specification for Bonding Compounds for Interior Gypsum Plastering
• Effective Date: 01-Apr-2020

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: C843 − 23
Standard Specification for
1
Application of Gypsum Veneer Plaster
This standard is issued under the fixed designation C843; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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* 1.7 This international standard was developed in accor-
dance with internationally recognized principles on standard-
1.1 This specification covers the minimum requirements for
ization established in the Decision on Principles for the
and methods of applying gypsum veneer plaster.
Development of International Standards, Guides and Recom-
1.2 Where a specific degree of fire resistance is required for
mendations issued by the World Trade Organization Technical
veneer plaster systems, applicable building code regulations
Barriers to Trade (TBT) Committee.
shall be followed.
2. Referenced Documents
1.2.1 Details of construction for a specific assembly to
2
achieve the required fire resistance shall be obtained from
2.1 ASTM Standards:
reports of fire-resistance tests, engineering evaluations, or
C11 Terminology Relating to Gypsum and Related Building
listings from recognized fire testing laboratories.
Materials and Systems
C587 Specification for Gypsum Veneer Plaster
1.3 Where a specific degree of sound control is required for
C631 Specification for Bonding Compounds for Interior
veneer plaster assemblies and constructions, details of con-
Gypsum Plastering
struction shall be obtained from reports of acoustical tests of
C844 Specification for Application of Gypsum Base to
assemblies that have met the required or specified acoustical
Receive Gypsum Veneer Plaster
performance.
C1047 Specification for Accessories for Gypsum Wallboard
NOTE 1—To ensure desirable results, coordinate this specification with
and Gypsum Veneer Base
Specification C844.
C1396 Specification for Gypsum Board
NOTE 2—General information regarding matters of a contractual nature
concerning veneer plaster work is found in Appendix X1. Additional
3. Terminology
technical information related to veneer plastering is provided in Appendix
3.1 Definitions:
X2.
3.1.1 See Terminology C11.
1.4 The values stated in inch-pound units are to be regarded
3.2 Definitions of Terms Specific to This Standard:
as the standard. The values given in parentheses are for
3.2.1 base coat, n—veneer plaster trowel or machine ap-
information only.
plied as the first coat of a two-component system.
1.5 The text of this specification references notes and
3.2.2 finish coat, n—veneer finish plaster trowel or machine
footnotes which provide explanatory material. These notes and
applied as the second coat over the base coat plaster in a
footnotes (excluding those in tables and figures) shall not be
two-component system.
considered as requirements of the specification.
3.2.2.1 smooth-trowel finish, n—a finish resulting from steel
1.6 This standard does not purport to address all of the
troweling with a minimum of water after the plaster has
safety concerns, if any, associated with its use. It is the
become firm. A smooth finish free of trowel marks, blemishes,
responsibility of the user of this standard to establish appro-
or other imperfections.
priate safety, health, and environmental practices and deter-
3.2.2.2 texture finish, n—a finish resulting from (1) trowel
mine the applicability of regulatory limitations prior to use.
application followed by floating or texturing of the surface with
any of a variety of tools using a minimum of water or (2)
machine application, left as applied or followed by hand
1
This specification is under the jurisdiction of ASTM Committee C11 on
texturing.
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.03 on Specifications for the Application of Gypsum and Other
2
Products in Assemblies. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2023. Published March 2023. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 1976. Last previous edition approved in 2017 as C843 – 17. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0843-23. the ASTM website.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation: C843 − 17 C843 − 23
Standard Specification for
1
Application of Gypsum Veneer Plaster
This standard is issued under the fixed designation C843; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript 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 for and methods of applying gypsum veneer plaster.
1.2 Where a specific degree of fire resistance is required for veneer plaster systems, applicable building code regulations shall be
followed.
1.2.1 Details of construction for a specific assembly to achieve the required fire resistance shall be obtained from reports of
fire-resistance tests, engineering evaluations, or listings from recognized fire testing laboratories.
1.3 Where a specific degree of sound control is required for veneer plaster assemblies and constructions, details of construction
shall be in compliance with official reports of tests conducted in recognized sound testing laboratories in accordance with the
applicable sound tests of Test Methodsobtained from reports of acoustical tests of assemblies that E90,have C423, met the required
or E492. specified acoustical performance.
NOTE 1—To ensure desirable results, coordinate this specification with Specification C844.
NOTE 2—General information regarding matters of a contractual nature concerning veneer plaster work is found in Appendix X1. Additional technical
information related to veneer plastering is provided in Appendix X2.
1.4 The values stated in inch-pound units are to be regarded as the standard. The values given in parentheses are for information
only.
1.5 The text of this specification references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the specification.
1.6 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility
of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of
regulatory limitations prior to use.
1.7 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
1
This specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility of
Subcommittee C11.03 on Specifications for the Application of Gypsum and Other Products in Assemblies.
Current edition approved May 1, 2017March 1, 2023. Published May 2017March 2023. Originally approved in 1976. Last previous edition approved in 20122017 as
C843 – 99 (2012).C843 – 17. DOI: 10.1520/C0843-17.10.1520/C0843-23.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C843 − 23
2. Referenced Documents
2
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C423 Test Method for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method
C587 Specification for Gypsum Veneer Plaster
3
C588/C588M Specification for Gypsum Base for Veneer Plasters (Withdrawn 2005)
C631 Specification for Bonding Compounds for Interior Gypsum Plastering
C844 Specification for Application of Gypsum Base to Receive Gypsum Veneer Plaster
C1047 Specification for Accessories for Gypsum Wallboard and Gypsum Veneer Base
E90C1396 Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and
ElementsSpecification for Gypsum Board
E492 Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the
Tapping Machine
3. Terminology
3.1 Definitions:
3.1.1 See Terminology C11.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 base coat, n—veneer plaster trowel or machine applied as the first coat of a two-component syste
...