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ASTM C842-05

(Specification)

Standard Specification for Application of Interior Gypsum Plaster

Standard Specification for Application of Interior Gypsum Plaster

ABSTRACT
This specification covers the minimum requirements for full-thickness interior gypsum plastering on gypsum, metal, masonry, or monolithic concrete bases designed or prepared to receive gypsum plaster. Gypsum plaster applied to the interior side of exterior walls of masonry or concrete shall be isolated from the exterior wall. Gypsum plasters shall not be used in exterior locations or interior wet areas. Plasters and other cementitious materials shall be kept dry until used; they shall be stored off the ground, under cover, and away from walls with condensation and other damp surfaces. Metal products shall be protected, while stored, against rusting. The surface preparations of plasters are presented in details. All plaster mixing shall be done by mechanical means unless hand mixing is specified. Plaster shall be applied by hand or machine as specified.
SCOPE
1.1 This specification covers the minimum requirements for full-thickness (in accordance with Table 1) interior gypsum plastering on gypsum, metal, masonry, or monolithic concrete bases designed or prepared to receive gypsum plaster.
1.1.1 Gypsum plaster applied to the interior side of exterior walls of masonry or concrete shall be isolated from the exterior wall.
1.2 Gypsum plasters shall not be used in exterior locations or interior "wet" areas.
Note 1—To secure desirable results, this specification should be coordinated with the provisions of Specification C 841. General information concerning full thickness gypsum plastering is contained in Annex A2, Annex A3, and Annex A4.
1.3 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.
1.4 Details of construction to achieve required sound control shall be obtained from reports of tests conducted at recognized sound testing laboratories in accordance with the applicable sound tests of Test Methods E 90, C 423, or E 492.
1.5 The values stated in inch-pound units are to be regarded as the standard. The SI (metric) values given in parentheses are approximate and are provided for information purposes only.
1.6 The text of this standard 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 standard.

General Information

Status
Historical
Publication Date
30-Apr-2005
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
Current Stage
Ref Project

Relations

Replaces
ASTM C842-99 - Standard Specification for Application of Interior Gypsum Plaster
Effective Date
01-May-2005
Replaced By
ASTM C842-05(2010)e1 - Standard Specification for Application of Interior Gypsum Plaster
Effective Date
01-Oct-2010
Referred By
ASTM C28/C28M-10(2020) - Standard Specification for Gypsum Plasters
Effective Date
01-May-2005
Referred By
ASTM C471M-20ae1 - Standard Test Methods for Chemical Analysis of Gypsum and Gypsum Products (Metric)
Effective Date
01-May-2005
Referred By
ASTM C206-14(2022) - Standard Specification for Finishing Hydrated Lime
Effective Date
01-May-2005
Referred By
ASTM C1546-19 - Standard Guide for Installation of Gypsum Products in Concealed Radiant Ceiling Heating Systems
Effective Date
01-May-2005
Referred By
ASTM C841-23 - Standard Specification for Installation of Interior Lathing and Furring
Effective Date
01-May-2005

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ASTM C842-05 - Standard Specification for Application of Interior Gypsum PlasterASTM C842-05 - Standard Specification for Application of Interior Gypsum Plaster
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ASTM C842-05 - Standard Specification for Application of Interior Gypsum Plaster
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: C842 – 05
Standard Specification for
1
Application of Interior Gypsum Plaster
This standard is issued under the fixed designation C842; 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.
1. Scope* C11 TerminologyRelatingtoGypsumandRelatedBuilding
Materials and Systems
1.1 This specification covers the minimum requirements for
C28/C28M Specification for Gypsum Plasters
full-thickness (in accordance with Table 1) interior gypsum
C35 Specification for Inorganic Aggregates for Use in
plastering on gypsum, metal, masonry, or monolithic concrete
Gypsum Plaster
bases designed or prepared to receive gypsum plaster.
C59/C59M Specification for Gypsum Casting Plaster and
1.1.1 Gypsum plaster applied to the interior side of exterior
Gypsum Molding Plaster
wallsofmasonryorconcreteshallbeisolatedfromtheexterior
C61/C61M Specification for Gypsum Keene’s Cement
wall.
C206 Specification for Finishing Hydrated Lime
1.2 Gypsum plasters shall not be used in exterior locations
C423 Test Method for Sound Absorption and Sound Ab-
or interior “wet” areas.
sorption Coefficients by the Reverberation Room Method
NOTE 1—To secure desirable results, this specification should be
C631 Specification for Bonding Compounds for Interior
coordinated with the provisions of Specification C841. General informa-
Gypsum Plastering
tion concerning full thickness gypsum plastering is contained in Annex
C841 Specification for Installation of Interior Lathing and
A2, Annex A3, and Annex A4.
Furring
1.3 Details of construction for a specific assembly to
C1489 Specification for Lime Putty for Structural Purposes
achieve the required fire resistance shall be obtained from
E90 Test Method for Laboratory Measurement of Airborne
reports of fire-resistance tests, engineering evaluations, or
Sound Transmission Loss of Building Partitions and Ele-
listings from recognized fire testing laboratories.
ments
1.4 Details of construction to achieve required sound con-
E492 Test Method for Laboratory Measurement of Impact
trol shall be obtained from reports of tests conducted at
Sound Transmission Through Floor-Ceiling Assemblies
recognized sound testing laboratories in accordance with the
Using the Tapping Machine
applicable sound tests of Test Methods E90, C423,or E492.
1.5 The values stated in inch-pound units are to be regarded
3. Terminology
as the standard.The SI (metric) values given in parentheses are
3.1 Definitions:
approximate and are provided for information purposes only.
3.1.1 Definitions shall be in accordance with Terminology
1.6 The text of this standard references notes and footnotes
C11.
which provide explanatory material. These notes and footnotes
3.2 Definitions of Terms Specific to This Standard:
(excluding those in tables and figures) shall not be considered
3.2.1 catfaces, n—blemishes or rough depressions in the
as requirements of the standard.
finish coat.
3.2.2 coat, n—a thickness or layer of plaster applied over a
2. Referenced Documents
surface in a single application.
2
2.1 ASTM Standards:
3.2.2.1 base coat, n—the sum of the scratch and brown
C5 Specification for Quicklime for Structural Purposes
coats or the total coats in place prior to application of finish
coats.
1
3.2.2.2 brown coat, n—the second coat of plaster applied in
This specification is under the jurisdiction of ASTM Committee C11 on
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
three-coat work.
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther
3.2.2.3 finish coat, n—the last coat of plaster applied in
Products in Assemblies.
either two-coat or three-coat work.
Current edition approved May 1, 2005. Published May 2005. Originally
3.2.2.4 scratch coat, n—the first coat of plaster applied over
approved in 1976. Last previous edition approved in 1999 as C842 – 99. DOI:
10.1520/C0842-05.
a lath or other substrate.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
*ASummary 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

---------------------- Page: 1 ----------------------
C842 – 05
3.2.2.5 three-coat work, n—plaster applied in three succes- or uneven heat or cold on the plaster, and maintained until the
sive coats, leaving time between coats for setting or drying, or permanent HVAC system is activated.
both, of the plaster
...

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SCOPE
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1.2 Table of Contents:    
Scope  
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Referenced Documents  
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Terminology  
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Delivery and Storage of Materials  
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Materials  
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Keywords  
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4.1 The purpose of the test methods in this standard is to measure the tensile strength or bond strength of portland cement-based plaster to its substrate. The values obtained using the test methods are not purported to be representative of the actual wind load capacity or other structural properties of a specific portland cement-based plaster installation but may be helpful in assessing such load capacities.  
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1.2 The values stated in inch-pound and SI (metric) units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system shall be used independent of the other. Values from the two systems shall not be combined.  
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1.4 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.

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ASTM C841-23(Specification)
Standard Specification for Installation of Interior Lathing and Furring

ABSTRACT
This specification covers the minimum requirements for, and the methods of application of, interior lathing and furring to receive gypsum plaster applied. Other materials are not prohibited from being used provided that their physical characteristics and durability under conditions of usage are at least equal in performance to those described. All materials shall be kept dry, preferably by being stored inside. Where necessary to be stored outside, materials shall be stacked off the ground, supported on a level platform, and protected from the weather and surface contamination. Materials shall be neatly stacked flat with care taken to avoid damage to edges, ends, or surfaces. The materials to be used are the following: tie wire and hanger wire, gypsum lath, expanded metal lath, welded wire lath, woven wire lath, nails, screws, staples, paper, and accessories such as control joints, cornerite, channels, rod and flat hangers, clips, and striplath. In general, during installation, the following shall be required: application of gypsum lath to supports, application of gypsum lath to wood supports, application of gypsum lath to metal supports, studless solid partitions (gypsum lath and plaster), application of metal plaster bases to framing members, studless solid partitions (metal lath and plaster), suspended and furred ceilings (metal lath and gypsum lath construction), main runners, cross furring, and metal furring for walls.
SCOPE
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Standard Specification for Molded Glass Fiber Reinforced Gypsum Parts

ABSTRACT
This specification covers molded glass fiber reinforced gypsum (GRG) parts, which are nonload-bearing, thin-shell, ornamental shapes for architectural embellishment of interior building construction. GRG parts shall be produced using the same materials used to make the composites in conformance with the referenced specification. GRG parts shall be manufactured from the mixed slurry or alpha gypsum cement, potable water and additives, and glass fiber reinforcement using either the hand lay-up or the spray-up process in a mold. GRG parts shall be produced according to approved shop drawings. Shop drawings shall specify part dimensions, quantities, recommended attachment points and methods, reinforcements, embedments, and tolerance. The material shall conform to the required mechanical properties and to the specified dimensions and tolerances of GRG parts.
SCOPE
1.1 This specification covers molded glass fiber reinforced gypsum (GRG) parts, which are nonload-bearing, thin-shell, ornamental shapes for architectural embellishment of interior building construction.  
1.2 The values stated in either SI units or inch-pound units are to be regarded separately as standard. Within the text, the SI units are shown in brackets. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.3 The information presented refers to the molded surface of the part.  
1.4 The text of this standard references footnotes, which provide explanatory material. These footnotes shall not be considered as requirements of the standard.  
1.5 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.

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ASTM
ASTM C843-23(Specification)
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.

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  • Technical specification
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