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ASTM C926-20a

Historical Revision

Standard Specification for Application of Portland Cement-Based Plaster

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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.

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 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.

1.4 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.

1.5 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 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.


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.


SDO ASTM: ASTM International
Document Number C926
Publication Date June 1, 2020
Language en - English
Page Count 14
Revision Level 20a
Supercedes
Committee C11.03
Publish Date Document Id Type View
May 1, 2024 C0926-24 Revision
Nov. 15, 2023 C0926-23A Revision
March 1, 2023 C0926-23 Revision
Dec. 1, 2022 C0926-22C Revision
Oct. 1, 2022 C0926-22B Revision
Aug. 15, 2022 C0926-22A Revision
June 1, 2022 C0926-22 Revision
Oct. 1, 2021 C0926-21 Revision
Sept. 15, 2020 C0926-20B Revision
June 1, 2020 C0926-20A Revision
Jan. 1, 2020 C0926-20 Revision
June 1, 2019 C0926-19AE01 Revision
June 1, 2019 C0926-19A Revision
May 1, 2019 C0926-19 Revision
Aug. 1, 2018 C0926-18B Revision
March 1, 2018 C0926-18A Revision
Jan. 1, 2018 C0926-18 Revision
Jan. 1, 2017 C0926-17 Revision
Dec. 1, 2016 C0926-16C Revision
Sept. 1, 2016 C0926-16B Revision
March 1, 2016 C0926-16A Revision
Jan. 1, 2016 C0926-16 Revision
July 15, 2015 C0926-15BE01 Revision
July 15, 2015 C0926-15B Revision
June 1, 2015 C0926-15A Revision
Feb. 1, 2015 C0926-15 Revision
April 15, 2014 C0926-14A Revision
April 1, 2014 C0926-14 Revision
Dec. 1, 2013 C0926-13A Revision
Feb. 1, 2013 C0926-13 Revision
Aug. 15, 2012 C0926-12A Revision
April 15, 2012 C0926-12 Revision
Oct. 1, 2011 C0926-11A Revision
May 15, 2011 C0926-11 Revision
June 1, 2006 C0926-06 Revision
June 10, 1998 C0926-98A Revision
July 1, 2005 C0926-98AR05 Reaffirmation