ASTM C1787-14(2019)

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

SCOPE
1.1 This specification applies to the minimum installation requirements for non metallic plaster bases used with portland cement based plaster in vertical wall applications.  
1.2 Where a fire resistance rating is required for plastered assemblies and constructions, details of construction shall be in accordance with reports of fire tests of assemblies that have met the requirements of the fire rating imposed.  
1.3 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems may result in non-conformance with the standard.  
1.4 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.  
1.5 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.  
1.6 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.

General Information

• Status: Historical
• Publication Date: 28-Feb-2019
• ICS: 91.100.10 - Cement. Gypsum. Lime. Mortar
• Technical Committee: C11 - Gypsum and Related Building Materials and Systems
• Drafting Committee: C11.03 - Specifications for the Application of Gypsum and Other Products in Assemblies

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:C1787 −14 (Reapproved 2019)
Standard Specification for
Installation of Non Metallic Plaster Bases (Lath) Used with
Portland Cement Based Plaster in Vertical Wall
Applications
This standard is issued under the fixed designation C1787; 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 2. Referenced Documents
2.1 ASTM Standards:
1.1 This specification applies to the minimum installation
C926 Specification for Application of Portland Cement-
requirements for non metallic plaster bases used with portland
Based Plaster
cement based plaster in vertical wall applications.
C954 Specification for Steel Drill Screws for theApplication
1.2 Where a fire resistance rating is required for plastered
of Gypsum Panel Products or Metal Plaster Bases to Steel
assemblies and constructions, details of construction shall be in
Studs from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in
accordance with reports of fire tests of assemblies that have
Thickness
met the requirements of the fire rating imposed.
C1063 Specification for Installation of Lathing and Furring
to Receive Interior and Exterior Portland Cement-Based
1.3 Units—The values stated in either SI units or inch-
Plaster
pound units are to be regarded separately as standard. The
E631 Terminology of Building Constructions
values stated in each system may not be exact equivalents;
C1788 Specification for Non Metallic Plaster Bases (Lath)
therefore, each system shall be used independently of the other.
Used with Portland Cement Based Plaster in Vertical Wall
Combining values from the two systems may result in non-
Applications
conformance with the standard.
1.4 Details of construction for a specific assembly to 3. Terminology
achieve the required fire resistance, sound or acoustic rating
3.1 Definitions—For definitions of terms used in these test
shall be obtained from reports of fire-resistance tests, engineer-
methods, See Terminology E631.
ing evaluations, or listings from recognized fire testing, sound
3.2 Definitions of Terms Specific to This Standard:
or acoustic laboratories.
3.2.1 portland cement based plaster, n—see Specification
1.5 This standard does not purport to address all of the
C926.
safety concerns, if any, associated with its use. It is the
3.2.2 non metallic plaster base (lath), n—material used as a
responsibility of the user of this standard to establish appro-
base for portland cement based plaster that is self furred and
priate safety, health, and environmental practices and deter-
meets or exceeds the requirements set forth in Specification
mine the applicability of regulatory limitations prior to use.
C1788.
1.6 This international standard was developed in accor-
3.2.3 framing member, n—see Specification C1063.
dance with internationally recognized principles on standard-
ization established in the Decision on Principles for the
4. Delivery and Storage of Materials
Development of International Standards, Guides and Recom-
4.1 All materials shall be delivered in original, undamaged
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee. containers.
4.2 Store materials inside or under cover protected from
weather.
This test method is under the jurisdiction ofASTM 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. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved March 1, 2019. Published March 2019. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2014. Last previous edition approved in 2014 as C1787 – 14. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C1787-14R19. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
C1787−14 (2019)
5. Coordination and Scheduling 8.3.1 Non metallic plaster base shall be attached to framing
members spaced not more than 16 in. (406 mm) on center with
5.1 Coordinate and schedule installation of non metallic
attachments spaced not more than 7 in. (178 mm) on center
plaster base with related work of other sections.
along supports.
8.3.2 Non metallic plaster base shall be attached with
6. Materials
manufacturer recommended fasteners. Staples shall be mini-
6.1 Materials shall conform to the requirements of the mum 16 gauge with crowns not less than ⁄4 in. (19 mm),
refe
...

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: C1787 − 14 C1787 − 14 (Reapproved 2019)
Standard Specification for
Installation of Non Metallic Plaster Bases (Lath) Used with
Portland Cement Based Plaster in Vertical Wall
Applications
This standard is issued under the fixed designation C1787; 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 applies to the minimum installation requirements for non metallic plaster bases used with portland cement
based plaster in vertical wall applications.
1.2 Where a fire resistance rating is required for plastered assemblies and constructions, details of construction shall be in
accordance with reports of fire tests of assemblies that have met the requirements of the fire rating imposed.
1.3 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 may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values
from the two systems may result in non-conformance with the standard.
1.4 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.
1.5 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 safety, health, and healthenvironmental practices and determine the
applicability of regulatory limitations prior to use.
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.
2. Referenced Documents
2.1 ASTM Standards:
C926 Specification for Application of Portland Cement-Based Plaster
C954 Specification for Steel Drill Screws for the Application of Gypsum Panel Products or Metal Plaster Bases to Steel Studs
from 0.033 in. (0.84 mm) to 0.112 in. (2.84 mm) in Thickness
C1063 Specification for Installation of Lathing and Furring to Receive Interior and Exterior Portland Cement-Based Plaster
E631 Terminology of Building Constructions
C1788 Specification 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.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 portland cement based plaster, n—see Specification C926.
This test method 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 Feb. 1, 2014March 1, 2019. Published April 2014March 2019. Originally approved in 2014. Last previous edition approved in 2014 as
C1787 – 14. DOI: 10.1520/C1787-14.10.1520/C1787-14R19.
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
C1787 − 14 (2019)
3.2.2 non metallic plaster base (lath), n—material used as a base for portland cement based plaster that is self furred and meets
or exceeds the requirements set forth in Specification C1788.
3.2.3 framing member, n—see Specification C1063.
4. Delivery and Storage of Materials
4.1 All materials shall be delivered in original, undamaged containers.
4.2 Store materials inside or under cover protected from weather.
5. Coordination and Scheduling
5.1 Coordinate and schedule installation of non metallic plaster base with related work of other sections.
6. Materials
6.1 Materials shall conform to the requirements of the referenced specifications and standards and to the requirements specified
herein.
6.2 Portland Cement Based Plaster, in accordance with Specification C926.
6.3 Accessories, in accordance with Specification C1063.
7. Appl
...