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    ASTM C1764 - 20

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

    Active Standard ASTM C1764 | Developed by Subcommittee: C11.02

    Book of Standards Volume: 04.01

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    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.

    1. 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.

    2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

    ASTM Standards

    C926 Specification for Application of Portland Cement-Based Plaster

    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

    ICC-ES Acceptance Criteria

    AC 191 Acceptance Criteria for Metal Plaster Bases (Lath)

    ICS Code

    ICS Number Code 91.100.10 (Cement. Gypsum. Lime. Mortar)

    UNSPSC Code

    UNSPSC Code 30111600(Cement and lime); 30111700(Plasters)

    Referencing This Standard
    Link Here
    Link to Active (This link will always route to the current Active version of the standard.)

    DOI: 10.1520/C1764-20

    Citation Format

    ASTM C1764-20, Standard Test Methods for Non Metallic Plaster Bases (Lath) Used With Portland Cement Based Plaster in Vertical Wall Applications, ASTM International, West Conshohocken, PA, 2020, www.astm.org

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