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ASTM C842-05(2021)

(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 C841. General information concerning full thickness gypsum plastering is contained in Annex A2 – 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 E90, C423, or E492.  
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.  
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
31-Mar-2021
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

Refers
ASTM C631-09(2020) - Standard Specification for Bonding Compounds for Interior Gypsum Plastering
Effective Date
01-Apr-2020
Refers
ASTM C28/C28M-10(2020) - Standard Specification for Gypsum Plasters
Effective Date
01-Jun-2020
Refers
ASTM C61/C61M-00(2020) - Standard Specification for Gypsum Keene's Cement
Effective Date
01-Jun-2020

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ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum PlasterASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
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ASTM C842-05(2021) - Standard Specification for Application of Interior Gypsum Plaster
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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:C842 −05 (Reapproved 2021)
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 2. Referenced Documents
2
1.1 This specification covers the minimum requirements for 2.1 ASTM Standards:
full-thickness (in accordance with Table 1) interior gypsum
C5 Specification for Quicklime for Structural Purposes
plastering on gypsum, metal, masonry, or monolithic concrete
C11 Terminology Relating to Gypsum and Related Building
bases designed or prepared to receive gypsum plaster.
Materials and Systems
1.1.1 Gypsum plaster applied to the interior side of exterior
C28/C28M Specification for Gypsum Plasters
wallsofmasonryorconcreteshallbeisolatedfromtheexterior
C35 Specification for Inorganic Aggregates for Use in Gyp-
wall.
sum Plaster
C59/C59M Specification for Gypsum Casting Plaster and
1.2 Gypsum plasters shall not be used in exterior locations
Gypsum Molding Plaster
or interior “wet” areas.
C61/C61M Specification for Gypsum Keene’s Cement
NOTE 1—To secure desirable results, this specification should be
C206 Specification for Finishing Hydrated Lime
coordinated with the provisions of Specification C841. General informa-
C423 Test Method for SoundAbsorption and SoundAbsorp-
tionconcerningfullthicknessgypsumplasteringiscontainedinAnnexA2
tion Coefficients by the Reverberation Room Method
– Annex A4.
C631 Specification for Bonding Compounds for Interior
1.3 Details of construction for a specific assembly to
Gypsum Plastering
achieve the required fire resistance shall be obtained from
C841 Specification for Installation of Interior Lathing and
reports of fire-resistance tests, engineering evaluations, or
Furring
listings from recognized fire testing laboratories.
C1489 Specification for Lime Putty for Structural Purposes
1.4 Details of construction to achieve required sound con-
E90 Test Method for Laboratory Measurement of Airborne
trol shall be obtained from reports of tests conducted at
Sound Transmission Loss of Building Partitions and
recognized sound testing laboratories in accordance with the
Elements
applicable sound tests of Test Methods E90, C423,or E492.
E492 Test Method for Laboratory Measurement of Impact
Sound Transmission Through Floor-Ceiling Assemblies
1.5 The values stated in inch-pound units are to be regarded
Using the Tapping Machine
as the standard.The SI (metric) values given in parentheses are
approximate and are provided for information purposes only.
3. Terminology
1.6 The text of this standard references notes and footnotes
3.1 Definitions:
which provide explanatory material. These notes and footnotes
3.1.1 Definitions shall be in accordance with Terminology
(excluding those in tables and figures) shall not be considered
as requirements of the standard. C11.
3.2 Definitions of Terms Specific to This Standard:
1.7 This international standard was developed in accor-
3.2.1 catfaces, n—blemishes or rough depressions in the
dance with internationally recognized principles on standard-
finish coat.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
3.2.2 coat, n—a thickness or layer of plaster applied over a
mendations issued by the World Trade Organization Technical
surface in a single application.
Barriers to Trade (TBT) Committee.
3.2.2.1 basecoat,n—thesumofthescratchandbrowncoats
or the total coats in place prior to application of finish coats.
1
This specification is under the jurisdiction of ASTM Committee C11 on
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther
2
Products in Assemblies. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved April 1, 2021. Published May 2021. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approvedin1976.Lastpreviouseditionapprovedin2015asC842– 05 (2015).DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0842-05R21. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C842−05 (2021)
3.2.2.2 brown coat, n—the second coat of plaster applied in 6. Environmental Conditions
three-
...

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1.1 This specification applies to the minimum installation requirements for non metallic plaster bases used with portland cement based plaster in vertical wall applications.  
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This specification covers the installation of lathing and furring to receive interior and exterior Portland cement-based plaster. The following materials shall be used: metal plaster bases—expanded metal lath and wire laths; accessories—steel, PVC plastic, zinc alloy, and cornerite; channels—external corner reinforcement and foundation weep screed; wire; rod and strap hangers; clips; fasteners—nails and screws. Hangers and cold-rolled channel main runner shall conform to the allowable spacing and spans, respectively. The following methods are discussed: installation of hangers for suspended ceilings under wood constructions, attachment of hangers to main runners, installation of main runners, installation of cross furring, metal furring for walls, lapping of metal plaster bases, spacing of attachments for metal plaster bases, application of metal plaster bases, and application of accessories.
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1.1 This specification covers the minimum technical requirements for the installation of lathing and furring for the application of exterior and interior portland cement-based plaster, as in Specification C926. These requirements do not by default define a unit of work or assign responsibility for contractual purposes, which is the purview of a contract or contracts made between contracting entities.  
1.2 Table of Contents:    
Scope  
1  
Referenced Documents  
2  
Terminology  
3  
Delivery and Storage of Materials  
4  
Materials  
5  
Requirements for Substrates to Receive Metal Lathing & Furring  
6  
Installation  
7  
Workmanship  
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Installation of Metal Furring for Walls  
7.2  
Installation of Metal Plaster Bases  
7.3  
Installation of Lathing Accessories  
7.4  
Keywords  
8  
Installation of Metal Furring for Suspended Ceilings  
Annex A1  
1.3 Where a fire resistance rating is required for plastered assemblies and constructions, details of construction shall be in accordance with reports of fire tests of assemblies that have met the requirements of the fire rating imposed.  
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4.1 Each abuse/impact property of abuse resistant wall panels is divided into three classification levels. The three levels of classification are: Level I, Level II, and Level III, with Level I representing the lowest rating for any given property. The test methods specified are utilized to establish the abuse-resistance classification of an abuse resistant wall panel. Each classification level requires a minimum overall specified performance. Any classified abuse resistant wall panel can be used at a classification level which is rated lower than the highest level qualified.
SCOPE
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1.1.1 This standard is a method of classifying gypsum panel product performance and is not intended to classify systems for abuse resistance.  
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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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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.
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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.  
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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
1.1 This specification covers the minimum requirements for, and the methods of application of, interior lathing and furring to receive gypsum plaster applied in accordance with Specification C842. 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.  
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.  
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 Where a specific degree of sound control is required for plastered 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.  
1.5 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.  
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Standard Specification for Application of Portland Cement-Based Plaster

ABSTRACT
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SCOPE
1.1 This specification covers the minimum technical requirements for the application of full thickness portland cement-based plaster for exterior (stucco) and interior work. These requirements do not by default define a unit of work or assign responsibility for contractual purposes, which is the purview of a contract or contracts made between contracting entities.  
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1.6 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 C11-23(Terminology)
Standard Terminology Relating to Gypsum and Related Building Materials and Systems

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