ASTM C1764-20

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

SIGNIFICANCE AND USE
4.1 General:  
4.1.1 Non metallic reinforced Portland cement based plaster are vertically applied exterior wall claddings that may be subject to variety of conditions over the claddings service life. These test methods evaluate performance under a variety of test conditions and exposures. Any given project may not be subject to all of the test conditions described herein and all of the test methods may not evaluate all exposures for a given project.  
4.2 Transverse Load:  
4.2.1 This test method determines the ultimate wind load resistance of the wall assembly including influence of the framing, sheathing, and means of attachment.  
4.3 Vertical Load:  
4.3.1 The weight and attachment mechanism of Portland cement Based Plaster results in a vertical load transfer to the plaster base. This test method determines the ultimate vertical load capacity of the cladding assembly based on taking the specimen to failure.  
4.4 Embedment:  
4.4.1 Plaster bases serve as a key, reinforcement and attachment mechanism for Portland cement based plaster. The thickness, profile, and material properties of the plaster bases must be such that it is adequately embedded in the Portland cement based plaster. This can be accomplished through use of a self furred non metallic plaster base or other means such as furring strips. This test method determines the effectiveness of the furring mechanism to ensure that the minimum embedment is obtained.  
4.5 Fastener Pull Through Resistance:  
4.5.1 The non metallic lath is secured to the building frame or substrate with fasteners. This test method evaluates the fastener attachment effectiveness.  
4.6 Alkali Resistance (Test Method Applies to Glass Fiber Materials Only):  
4.6.1 In accordance with Test Method E2098/E2098M.
SCOPE
1.1 These test methods evaluate the performance of vertical wall applications of non metallic plaster bases used with Portland cement based plaster under a variety of test exposures.  
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 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.  
1.4 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: C1764 − 20
Standard Test Methods 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 C1764; 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 Breaking Strength of Glass Fiber Reinforcing Mesh for
Use in Class PB Exterior Insulation and Finish Systems
1.1 These test methods evaluate the performance of vertical
(EIFS), after Exposure to a Sodium Hydroxide Solution
wall applications of non metallic plaster bases used with
3
2.2 ICC-ES Acceptance Criteria:
Portlandcementbasedplasterunderavarietyoftestexposures.
AC 191 Acceptance Criteria for Metal Plaster Bases (Lath)
1.2 Units—The values stated in either SI units or inch-
pound units are to be regarded separately as standard. The
3. Terminology
values stated in each system are not necessarily exact equiva-
3.1 Definitions:
lents; therefore, to ensure conformance with the standard, each
3.1.1 For definitions of terms used in these test methods,
system shall be used independently of the other, and values
refer to Terminology E631.
from the two systems shall not be combined.
3.2 Definitions of Terms Specific to This Standard:
1.3 This standard does not purport to address all of the
3.2.1 non metallic, plaster base (lath)—a product manufac-
safety concerns, if any, associated with its use. It is the
tured from non metal materials that serves as a base for
responsibility of the user of this standard to establish appro-
Portland cement based plaster.
priate safety, health, and environmental practices and deter-
3.2.1.1 Discussion—Examples of non metallic materials are
mine the applicability of regulatory limitations prior to use.
plastic, glass fiber, and nylon
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
4. Significance and Use
ization established in the Decision on Principles for the
4.1 General:
Development of International Standards, Guides and Recom-
4.1.1 Non metallic reinforced Portland cement based plaster
mendations issued by the World Trade Organization Technical
are vertically applied exterior wall claddings that may be
Barriers to Trade (TBT) Committee.
subject to variety of conditions over the claddings service life.
These test methods evaluate performance under a variety of
2. Referenced Documents
test conditions and exposures. Any given project may not be
2
2.1 ASTM Standards:
subject to all of the test conditions described herein and all of
C926 Specification for Application of Portland Cement-
the test methods may not evaluate all exposures for a given
Based Plaster
project.
E330/E330M Test Method for Structural Performance of
4.2 Transverse Load:
Exterior Windows, Doors, Skylights and Curtain Walls by
4.2.1 This test method determines the ultimate wind load
Uniform Static Air Pressure Difference
resistance of the wall assembly including influence of the
E631 Terminology of Building Constructions
framing, sheathing, and means of attachment.
E2098/E2098M Test Method for Determining Tensile
4.3 Vertical Load:
4.3.1 The weight and attachment mechanism of Portland
1
These test methods are under the jurisdiction of ASTM Committee C11 on cement Based Plaster results in a vertical load transfer to the
Gypsum and Related Building Materials and Systems and is the direct responsibility
plaster base. This test method determines the ultimate vertical
of Subcommittee C11.02 on Specifications and Test Methods for Accessories and
load capacity of the cladding assembly based on taking the
Related Products.
specimen to failure.
Current edition approved Oct. 15, 2020. Published November 2020. Originally
approved in 2012. Last previous edition approved in 2018 as C1764 – 12 (2018).
4.4 Embedment:
DOI: 10.1520/C1764-20.
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
3
Standards volume information, refer to the standard’s Document Summary page on Available from International Code Council (ICC), 500 New Jersey Ave., NW,
the ASTM website. 6th Floor, Washington, DC 20001, http://www.iccsafe.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C1764 − 20
1
4.4.1 Plaster bases serve as a key, rei
...

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: C1764 − 12 (Reapproved 2018) C1764 − 20
Standard Test Methods 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 C1764; 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 These test methods evaluate the performance of vertical wall applications of non metallic plaster bases used with Portland
Cement Based Plastercement based plaster under a variety of test exposures.
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 mayare not benecessarily exact equivalents; therefore, to ensure conformance with the standard, each system shall be
used independently of the other. Combiningother, and values from the two systems may result in non-conformance with the
standard.shall not be combined.
1.3 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.
1.4 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
E330/E330M Test Method for Structural Performance of Exterior Windows, Doors, Skylights and Curtain Walls by Uniform
Static Air Pressure Difference
E631 Terminology of Building Constructions
E2098/E2098M Test Method for Determining Tensile Breaking Strength of Glass Fiber Reinforcing Mesh for Use in Class PB
Exterior Insulation and Finish Systems (EIFS), after Exposure to a Sodium Hydroxide Solution
3
2.2 ICC-ES Acceptance Criteria:
AC 191 Acceptance Criteria for Metal Plaster Bases (Lath)
3. Terminology
3.1 Definitions—For definitions of terms used in these test methods, refer to Terminology E631.
1
These test methods are 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 Oct. 1, 2018Oct. 15, 2020. Published October 2018November 2020. Originally approved in 2012. Last previous edition approved in 20162018
as C1764 – 12 (2016).(2018). DOI: 10.1520/C1764-12R18.10.1520/C1764-20.
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.
3
Available from International Code Council (ICC), 500 New Jersey Ave., NW, 6th Floor, Washington, DC 20001, http://www.iccsafe.org.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1764 − 20
3.1 Definitions:
3.1.1 For definitions of terms used in these test methods, refer to Terminology E631.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 non metallic, plaster base (lath)—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.cement based plaster.
3.2.1.1 Discussion—
Examples of non metallic materials are plastic, glass fiber, and nylon
4. Significance and Use
4.1 General:
4.1.1 Non metallic reinforced Portland Cement Based Plastercement based plaster are vertically applied exterior wall claddings
that may be subject to variety of conditions over the claddings service life. The series of tests described in this standard evaluates
These test methods evaluate performance under a variety of test conditions and exposures. Any given project may not be subject
to all of the test conditions described herein and all of the test methods may not evaluate all exposures for a given p
...