ASTM C926-17
(Specification)Standard Specification for Application of Portland Cement-Based Plaster
Standard Specification for Application of Portland Cement-Based Plaster
ABSTRACT
This specification covers the standard requirements for the application of full thickness Portland cement-based plaster for exterior (stucco) and interior work. It also sets forth tables for proportioning of various plaster mixes and plaster thickness. The materials used shall consist of the following: cement which shall be a Portland cement, air-entraining Portland cement, masonry cement, blended hydraulic cement, air-entraining blended hydraulic cement, or plastic cement; Type S hydrated lime; aggregates such as perlite and sand for base and job-mixed finish coats; water to be used in mixing; admixtures; and fibers. Surfaces of solid bases such as masonry, stone, cast-in-place or precast concrete shall be prepared either by sandblasting, wire brushing, acid etching, chipping, or a combination thereof. Details on curing to resist cracking; materials protection and storage; environmental conditions; and application of plaster, finish-coat, and fog-coat, which shall be done by hand or machine up to the specified nominal thickness on metal and solid plaster bases are discussed.
SCOPE
1.1 This specification covers the 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.
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.
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Designation:C926 −17
Standard Specification for
1
Application of Portland Cement-Based Plaster
This standard is issued under the fixed designation C926; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* C150Specification for Portland Cement
C206Specification for Finishing Hydrated Lime
1.1 This specification covers the requirements for the appli-
C207Specification for Hydrated Lime for Masonry Pur-
cation of full thickness portland cement-based plaster for
poses
exterior (stucco) and interior work. These requirements do not
C219Terminology Relating to Hydraulic Cement
by default define a unit of work or assign responsibility for
C260Specification for Air-Entraining Admixtures for Con-
contractual purposes, which is the purview of a contract or
crete
contracts made between contracting entities.
C578Specification for Rigid, Cellular Polystyrene Thermal
1.2 This specification sets forth tables for proportioning of
Insulation
various plaster mixes and plaster thickness.
C595Specification for Blended Hydraulic Cements
C631Specification for Bonding Compounds for Interior
NOTE 1—General information will be found in Annex A1. Design
considerations will be found in Annex A2. Gypsum Plastering
C897Specification for Aggregate for Job-Mixed Portland
1.3 Thevaluesstatedininch-poundunitsaretoberegarded
Cement-Based Plasters
asthestandard.TheSI(metric)valuesgiveninparenthesesare
C932 Specification for Surface-Applied Bonding Com-
approximate and are provided for information purposes only.
pounds for Exterior Plastering
1.4 The text of this specification references notes and
C1063Specification 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.
C1116 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
C1328Specification for Plastic (Stucco) Cement
reports of fire-resistance tests, engineering evaluations, or
C1787Specification for Installation of Non Metallic Plaster
listings from recognized fire testing laboratories.
Bases (Lath) Used with Portland Cement Based Plaster in
Vertical Wall Applications
2. Referenced Documents
E90Test Method for Laboratory Measurement of Airborne
2
2.1 ASTM Standards: Sound Transmission Loss of Building Partitions and
C11Terminology Relating to Gypsum and Related Building Elements
Materials and Systems E119Test Methods for Fire Tests of Building Construction
C25Test Methods for Chemical Analysis of Limestone, and Materials
Quicklime, and Hydrated Lime E492Test Method for Laboratory Measurement of Impact
C35Specification for InorganicAggregates for Use in Gyp- Sound Transmission Through Floor-Ceiling Assemblies
sum Plaster Using the Tapping Machine
C91Specification for Masonry Cement
2.2 ANSI Standard:
3
A108.1Specification for Installation of Ceramic Tile
1
This specification is under the jurisdiction of ASTM Committee C11 on
3. Terminology
GypsumandRelatedBuildingMaterialsandSystemsandisthedirectresponsibility
ofSubcommitteeC11.03onSpecificationsfortheApplicationofGypsumandOther
3.1 Terms shall be defined as in Terminologies C11 and
Products in Assemblies.
C219, except as modified herein.
Current edition approved Jan. 1, 2017. Published January 2017. Originally
approved in 1981. Last previous edition approved in 2016 as C926–16c. DOI:
3.2 Definitions of Terms Specific to This Standard:
10.1520/C0926-17.
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
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.
*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
---------------------- Page: 1 ----------------------
C926−17
3.2.1 accelerator, n—an admixture that will shorten the 3.2.11.7 fog coat, n—a light coat of cement and water, with
setting time of plaster. or without aggregate or color pigment, applied by machine
spray to improve color consistency.
3.2.2 admixture, n—a material other than water, aggregate,
or basic cementitious material added to the batch before or
3.2.11.8 scratch coat, n—the
...
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: C926 − 16c C926 − 17
Standard Specification for
1
Application of Portland Cement-Based Plaster
This standard is issued under the fixed designation C926; 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*
1.1 This specification covers the 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.
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.
2. Referenced Documents
2
2.1 ASTM Standards:
C11 Terminology Relating to Gypsum and Related Building Materials and Systems
C25 Test Methods for Chemical Analysis of Limestone, Quicklime, and Hydrated Lime
C35 Specification for Inorganic Aggregates for Use in Gypsum Plaster
C91 Specification for Masonry Cement
C150 Specification for Portland Cement
C206 Specification for Finishing Hydrated Lime
C207 Specification for Hydrated Lime for Masonry Purposes
C219 Terminology Relating to Hydraulic Cement
C260 Specification for Air-Entraining Admixtures for Concrete
C578 Specification for Rigid, Cellular Polystyrene Thermal Insulation
C595 Specification for Blended Hydraulic Cements
C631 Specification for Bonding Compounds for Interior Gypsum Plastering
C897 Specification for Aggregate for Job-Mixed Portland Cement-Based Plasters
C932 Specification for Surface-Applied Bonding Compounds for Exterior Plastering
C1063 Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
C1116 Specification for Fiber-Reinforced Concrete and Shotcrete
C1328 Specification for Plastic (Stucco) Cement
C1787 Specification for Installation of Non Metallic Plaster Bases (Lath) Used with Portland Cement Based Plaster in Vertical
Wall Applications
E90 Test Method for Laboratory Measurement of Airborne Sound Transmission Loss of Building Partitions and Elements
E119 Test Methods for Fire Tests of Building Construction and Materials
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 Dec. 1, 2016Jan. 1, 2017. Published January 2017. Originally approved in 1981. Last previous edition approved in 2016 as
C926 – 16b.C926 – 16c. DOI: 10.1520/C0926-16C.10.1520/C0926-17.
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.
*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
---------------------- Page: 1 ----------------------
C926 − 17
E492 Test Method for Laboratory Measurement of Impact Sound Transmission Through Floor-Ceiling Assemblies Using the
Tapping Machine
2.2 ANSI Standard:
3
A108.1 Specification for Installation of Ceramic Tile
3. Terminology
3.1 Terms shall be defined as in Terminologies C11 and C219, except as modified herein.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 accelerator, n—an admixture that will shorten the setting time of plaster.
3.2.2 admixture, n—
...
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