ASTM C1788-20

Standard Specification for Non Metallic Plaster Bases (Lath) Used With Portland Cement Based Plaster in Vertical Wall Applications

ABSTRACT
This standard covers the use of non-metallic plaster bases with portland cement-based plaster in vertical wall applications and provides details of requirements with respect to inspection of the material as well as rejection, product packaging and marking, and performance.
SCOPE
1.1 This specification provides the minimum specification for use of non metallic plaster bases with Portland cement based plaster in vertical wall applications.  
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used independently of the other, and values from the two systems shall not be combined.  
1.3 Details of construction for a specific assembly to achieve the required fire resistance, sound, or acoustic rating shall be obtained from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing, sound or acoustic laboratories.  
1.4 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.  
1.5 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.

General Information

• Status: Published
• Publication Date: 14-Oct-2020
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.02 - Specifications and Test Methods for Accessories and Related Products

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:C1788 −20
Standard Specification for
Non Metallic Plaster Bases (Lath) Used With Portland
1
Cement Based Plaster in Vertical Wall Applications
This standard is issued under the fixed designation C1788; 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 E631 Terminology of Building Constructions
C1764 Test Methods for Non Metallic Plaster Bases (Lath)
1.1 This specification provides the minimum specification
Used with Portland Cement Based Plaster in Vertical Wall
for use of non metallic plaster bases with Portland cement
Applications
based plaster in vertical wall applications.
3. Terminology
1.2 Units—The values stated in either SI units or inch-
pound units are to be regarded separately as standard. The
3.1 Definitions:
values stated in each system are not necessarily exact equiva-
3.1.1 For definitions of terms used in this specification, see
lents; therefore, to ensure conformance with the standard, each
Terminology E631.
system shall be used independently of the other, and values
3.2 Definitions of Terms Specific to This Standard:
from the two systems shall not be combined.
3.2.1 non metallic plaster base (lath), n—a product manu-
factured from non metal materials that serves as a base for
1.3 Details of construction for a specific assembly to
Portland cement based plaster.
achieve the required fire resistance, sound, or acoustic rating
3.2.1.1 Discussion—Examples of non metallic materials are
shall be obtained from reports of fire-resistance tests, engineer-
plastic, glass fiber, and nylon.
ing evaluations, or listings from recognized fire testing, sound
or acoustic laboratories.
3.2.2 Portland cement based plaster, n—in accordance with
Specification C926.
1.4 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
4. Inspection
responsibility of the user of this standard to establish appro-
4.1 Inspection of the material shall be agreed upon between
priate safety, health, and environmental practices and deter-
the purchaser and producer or supplier as part of the purchase
mine the applicability of regulatory limitations prior to use.
agreement.
1.5 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5. Rejection
ization established in the Decision on Principles for the
5.1 Material that fails to conform to the requirements of this
Development of International Standards, Guides and Recom-
specification may be rejected. Rejection should be reported to
mendations issued by the World Trade Organization Technical
the producer or supplier promptly and in writing. In case of
Barriers to Trade (TBT) Committee.
dissatisfaction with the results of the test, the producer or
2. Referenced Documents
supplier may make claim for a rehearing.
2
2.1 ASTM Standards:
6. Product Packaging
C926 Specification for Application of Portland Cement-
6.1 Nonmetallicplasterbasesshallbepackagedinsheetsor
Based Plaster
rolls in sizes that is convenient for shipping, handling, as well
as application.
1
This specification is under the jurisdiction of ASTM Committee C11 on
7. Product Marking
Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
7.1 Markings shall include the name of the producer and
Related Products.
brand, and description of the contents shall be legibly marked
Current edition approved Oct. 15, 2020. Published November 2020. Originally
approved in 2014. Last previous edition approved in 2019 as C1788 – 14 (2019). on each pallet or roll.
DOI: 10.1520/C1788-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or 8. Performance Requirements
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
8.1 Table1containstheperformancerequirementsusingthe
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. test methods described in Test Methods C1764.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1788−20
TABLE 1 Performance Requirements
Property Test Methods Requirements
Transverse Load Test Methods C1764 Specimens shall be tested in both positive and negative directions. Ultimate load is
achieved when the specimen no longer main
...

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: C1788 − 14 (Reapproved 2019) C1788 − 20
Standard Specification for
Non Metallic Plaster Bases (Lath) Used withWith Portland
1
Cement Based Plaster in Vertical Wall Applications
This standard is issued under the fixed designation C1788; 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 standardspecification provides the minimum specification for use of non metallic plaster bases with portlandPortland
cement based plaster in vertical wall applications.
1.2 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in
each system are not necessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be used
independently of the other, and values from the two systems shall not be combined.
1.3 Details of construction for a specific assembly to achieve the required fire resistance, sound, or acoustic rating shall be obtained
from reports of fire-resistance tests, engineering evaluations, or listings from recognized fire testing, sound or acoustic laboratories.
1.4 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.
1.5 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.
2. Referenced Documents
2
2.1 ASTM Standards:
C926 Specification for Application of Portland Cement-Based Plaster
E631 Terminology of Building Constructions
C1764 Test Methods for Non Metallic Plaster Bases (Lath) Used with Portland Cement Based Plaster in Vertical Wall
Applications
3. Terminology
3.1 Definitions—For definitions of terms used in these test methods, See Terminology E631.
3.1 Definitions:
1
This test method specification is under the jurisdiction of ASTM Committee C11 on Gypsum and Related Building Materials and Systems and is the direct responsibility
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and Related Products.
Current edition approved March 1, 2019Oct. 15, 2020. Published March 2019November 2020. Originally approved in 2014. Last previous edition approved in 20142019
as C1788 – 14.C1788 – 14 (2019). DOI: 10.1520/C1788-14R19.10.1520/C1788-20.
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 Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1788 − 20
3.1.1 For definitions of terms used in this specification, see Terminology E631.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 portland cement based plaster, n—in accordance with Specification C926.
3.2.1 non metallic plaster base (lath), n—material used a product manufactured from non metal materials that serves as a base for
portland cement based plaster that is flat or self furred, that meets or exceeds the requirements set forth in Portland cement based
plaster.Table 1.
3.2.1.1 Discussion—
Examples of non metallic materials are plastic, glass fiber, and nylon.
3.2.2 Portland cement based plaster, n—in accordance with Specification C926.
4. Inspection
4.1 Inspection of the material shall be agreed upon between the purchaser and producer or supplier as part of the purchase
agreement.
5. Rejection
5.1 Material that fails to conform to the requirements of this specification may be rejected. Rejection should be reported to the
producer or supplier promptly and in writing. In case of dissatisfaction with the results of the test, the producer or supplier may
make claim for a rehearing.
6. Product Packaging
6.1 Non metallic plaster bases shall be packaged in sheets or rolls in sizes that is convenient for shipping, handling, as well
...