ASTM C926-98a(2005)

Standard Specification for Application of Portland Cement-Based Plaster

SCOPE
1.1 This specification covers the requirements for the application of full thickness portland cement-based plaster for exterior (stucco) and interior work.
1.2 This specification sets forth tables for proportioning of various plaster mixes and plaster thickness.
Note 1—General information will be found in Annex A1. Design considerations will be found in Annex A2.
1.3 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.
1.4 The text of this specification references notes and footnotes that provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the specification.
1.5 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.

General Information

• Status: Historical
• Publication Date: 30-Jun-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

Relations

• Replaces: ASTM C926-98a - Standard Specification for Application of Portland Cement-Based Plaster
• Effective Date: 01-Jul-2005
• Replaced By: ASTM C926-06 - Standard Specification for Application of Portland Cement-Based Plaster
• Effective Date: 01-Jun-2006
• Referred By: ASTM C1861-23 - Standard Specification for Lathing and Furring Accessories, and Fasteners, for Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1788-20 - Standard Specification for Non Metallic Plaster Bases (Lath) Used With Portland Cement Based Plaster in Vertical Wall Applications
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1780-23a - Standard Practice for Installation Methods for Cement-based Adhered Masonry Veneer
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1328/C1328M-23 - Standard Specification for Plastic (Stucco) Cement
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1063-23 - Standard Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1787-23 - Standard Specification for Installation of Non Metallic Plaster Bases (Lath) Used with Portland Cement Based Plaster in Vertical Wall Applications
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1764-20 - Standard Test Methods for Non Metallic Plaster Bases (Lath) Used With Portland Cement Based Plaster in Vertical Wall Applications
• Effective Date: 01-Jul-2005
• Referred By: ASTM E2266-22 - Standard Guide for Design and Construction of Low-Rise Frame Building Wall Systems to Resist Water Intrusion
• Effective Date: 01-Jul-2005
• Referred By: ASTM C1324-20a - Standard Test Method for Examination and Analysis of Hardened Masonry Mortar
• Effective Date: 01-Jul-2005

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: C 926 – 98a (Reapproved 2005)
Standard Specification for
1
Application of Portland Cement-Based Plaster
This standard is issued under the fixed designation C 926; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope C 207 Specification for Hydrated Lime for Masonry Pur-
poses
1.1 This specification covers the requirements for the appli-
C 219 Terminology Relating to Hydraulic Cement
cation of full thickness portland cement-based plaster for
C 260 Specification forAir-EntrainingAdmixtures for Con-
exterior (stucco) and interior work.
crete
1.2 This specification sets forth tables for proportioning of
C 595 Specification for Blended Hydraulic Cements
various plaster mixes and plaster thickness.
C 631 Specification for Bonding Compounds for Interior
NOTE 1—General information will be found in Annex A1. Design
Plastering
considerations will be found in Annex A2.
C 897 Specification for Aggregate for Job-Mixed Portland
1.3 The values stated in inch-pound units are to be regarded
Cement-Based Plasters
as the standard.The SI (metric) values given in parentheses are
C 932 Specification for Surface-Applied BondingAgent for
approximate and are provided for information purposes only.
Exterior Plastering
1.4 The text of this specification references notes and
C 1063 Specification for Installation of Lathing and Furring
footnotes that provide explanatory material. These notes and
to Receive Interior and Exterior Portland Cement-Based
footnotes (excluding those in tables and figures) shall not be
Plaster
considered as requirements of the specification.
C 1116 Specification for Fiber-Reinforced Concrete and
1.5 Details of construction for a specific assembly to
Shotcrete
achieve the required fire resistance shall be obtained from
C 1328 Specification for Plastic (Stucco) Cement
reports of fire-resistance tests, engineering evaluations, or
E90 Test Method for Laboratory Measurement of
listings from recognized fire testing laboratories.
Airborne-Sound Transmission Loss of Building Partitions
and Elements
2. Referenced Documents
E119 Test Methods for Fire Tests of Building Construction
2
2.1 ASTM Standards:
and Materials
C11 Terminology Relating to Gypsum and Related Build-
E 492 Test Method for Laboratory Measurement of Impact
ing Materials and Systems
Sound Transmission Through Floor-Ceiling Assemblies
C25 Test Methods for Chemical Analysis of Limestone,
Using the Tapping Machine
Quicklime, and Hydrated Lime
2.2 ANSI Standard:
3
C35 Specification for Inorganic Aggregates for Use in
A108.1 Specification for Installation of Ceramic Tile
Gypsum Plaster
3. Terminology
C91 Specification for Masonry Cement
C 150 Specification for Portland Cement
3.1 Terms shall be defined as in Terminologies C11 and
C 206 Specification for Finishing Hydrated Lime
C 219, except as modified herein.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 accelerator—an admixture that will shorten the set-
1
This specification is under the jurisdiction of ASTM Committee C11 on
ting time of plaster.
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
3.2.2 admixture—a material other than water, aggregate, or
of Subcommittee C11.03 on Specifications for Application of Gypsum and Other
Products on Assemblies.
basic cementitious material added to the batch before or during
Current edition approved July 1, 2005. Published August 2005. Originally
job mixing.
approved in 1981. Last previous edition approved in 1998 as C 926–98a.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available fromAmerican National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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C 926 – 98a (2005)
3.2.3 acid etching—the cleansing and controlled erosion of 3.2.13 factory prepared (“mill-mixed” or “ready mixed”)—
a solid surface, using an acid wash. pertaining to material combinations that have been formulated
and dry-blended by the manufacturer, requiring only the
3.2.4 air entrainment—the use of an air-entraining admix-
addition of and mixing with water to produce plaster.
ture or air-entraining cementitious material in a plaster mix to
3.2.14 fiber, natural or synthetic—an elongated fiber or
yield a controlled quantity of minute (typically between 10 and
strand admixt
...