ASTM C1858-17a

Standard Practice for Design, Construction, and Material Requirements for Direct Hung Suspended T-bar Type Ceiling Systems Intended to Receive Gypsum Panel Products in Areas Subject to Earthquake Ground Motions

SIGNIFICANCE AND USE
5.1 This practice provides a standardized installation procedure for ceilings designed and installed as a diaphragm. When installed according to this practice, these ceilings have sufficient strength to resist seismic forces without lateral force bracing.
SCOPE
1.1 This practice covers the installation requirements of direct hung suspended t-bar type ceiling systems intended to receive gypsum panel products constructed as flat, single level, surrounded on all sides by a wall, bulk head, or soffit braced to the building structure to resist the effects of earthquake ground motions.  
1.2 Ceiling assembly shall not be intended to support live loads.  
1.3 This standard addresses ceiling systems with dead loads up to 10 lbs/ft2 (48.8 kg/m2).  
1.4 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.  
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard  
1.6 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.  
1.7 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: 30-Sep-2017
• ICS: 91.060.30 - Ceilings. Floors. Stairs
• 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: C1858 − 17a
Standard Practice for
Design, Construction, and Material Requirements for Direct
Hung Suspended T-bar Type Ceiling Systems Intended to
Receive Gypsum Panel Products in Areas Subject to
1
Earthquake Ground Motions
This standard is issued under the fixed designation C1858; 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 mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
1.1 This practice covers the installation requirements of
direct hung suspended t-bar type ceiling systems intended to
2. Referenced Documents
receive gypsum panel products constructed as flat, single level,
2.1 ASTM Standards:
surrounded on all sides by a wall, bulk head, or soffit braced to
A641/A641M Specification for Zinc–Coated (Galvanized)
the building structure to resist the effects of earthquake ground
2
Carbon Steel Wire
motions.
C645 Specification for Nonstructural Steel Framing Mem-
4
1.2 Ceiling assembly shall not be intended to support live
bers
loads.
C754 Specification for Installation of Steel Framing Mem-
4
1.3 This standard addresses ceiling systems with dead loads bers to Receive Screw-Attached Gypsum Panel Products
2 2
C1177/C1177M Specification for Glass Mat Gypsum Sub-
up to 10 lbs/ft (48.8 kg/m ).
4
strate for Use as Sheathing
1.4 The values stated in either SI units or inch-pound units
4
C1396 Specification for Gypsum Board
are to be regarded separately as standard. The values stated in
C1658/C1658M Specification for Glass Mat Gypsum Pan-
each system may not be exact equivalents; therefore, each
4
els
system shall be used independently of the other. Combining
E3090/E3090M Test Methods for Strength Properties of
values from the two systems may result in non-conformance
3
Metal Ceiling Suspension Systems
with the standard.
3. Terminology
1.5 The text of this standard references notes and footnotes
which provide explanatory material. These notes and footnotes
3.1 Definitions—Terms shall be as defined in Terminology
(excluding those in tables and figures) shall not be considered
C11.
as requirements of the standard
3.2 Definitions of Terms Specific to This Standard:
1.6 This standard does not purport to address all of the
3.2.1 counter sloping wire, n—opposing suspension wire
safety concerns, if any, associated with its use. It is the
intended to counteract the force of an out of plumb suspension
responsibility of the user of this standard to establish appro-
wire and maintain alignment of the system.
priate safety, health, and environmental practices and deter-
3.2.2 cross runner, n—the secondary support members or
mine the applicability of regulatory limitations prior to use.
cross beams of a mechanical ceiling suspension system trans-
1.7 This international standard was developed in accor-
ferring ceiling load to the main runner.
dance with internationally recognized principles on standard-
3.2.3 diaphragm, n—horizontal system acting to transmit
ization established in the Decision on Principles for the
lateral forces to the vertical resisting elements.
Development of International Standards, Guides and Recom-
3.2.4 direct hung ceiling, n—load carrying ceiling compo-
nents that are fastened directly to structure.
1
3.2.5 main runner, n—the primary or main beams (supports)
This test method is under the jurisdiction ofASTM Committee C11 on Gypsum
and Related Building Materials and Systems and is the direct responsibility of
of the ceiling suspension system.
Subcommittee C11.03 on Specifications for the Application of Gypsum and Other
Products in Assemblies.
2
Current edition approved Oct. 1, 2017. Published November 2017. Originally Annual ASTM Book of Standards,Vol.01.06.
4
approved in 1991. Last previous edition approved in 2017 as C1858 – 17. DOI: Annual ASTM Book of StandardsVol.04.01.
3
10.1520/C1858-17A. Annual ASTM Book of Standards,Vol.04.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1858 − 17a
3.2.6 t-bar ceiling, n—modular interlocking suspended ceil- of the member within the loops. The wire shall be wrapped
ing system containing framing members with inverted around itself a minimum of three full turns (360° each) within
T-shaped profiles. a 3-in [75 mm] length. For safety purposes, the bottom of the
hanger wires shall either be cut close to the vertical portion of
4. Summary of Practice
the wire or shall be bent upward parallel to the vertical portion
4.1 This practice outlines the design and installation re-
...

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: C1858 − 17 C1858 − 17a
Standard Practice for
Design, Construction, and Material Requirements for Direct
Hung Suspended T-bar Type Ceiling Systems Intended to
Receive Gypsum Panel Products in Areas Subject to
1
Earthquake Ground Motions
This standard is issued under the fixed designation C1858; 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 practice covers the installation requirements of direct hung suspended t-bar type ceiling systems intended to receive
gypsum panel products constructed as flat, single level, surrounded on all sides by a wall, bulk head, or soffit braced to the building
structure to resist the effects of earthquake ground motions.
1.2 Ceiling assembly shall not be intended to support live loads.
2 2
1.3 This standard addresses ceiling systems with dead loads up to 10 lbs/ft (48.8 kg/m ).
1.4 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.
1.5 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard
1.6 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 standard safetysafety, health, and healthenvironmental practices and determine
the applicability of regulatory limitations prior to use.
1.7 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:
2
A641/A641M Specification for Zinc–Coated (Galvanized) Carbon Steel Wire
C635/C635M Specification for Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and
Lay-in Panel Ceilings
4
C645 Specification for Nonstructural Steel Framing Members
4
C754 Specification for Installation of Steel Framing Members to Receive Screw-Attached Gypsum Panel Products
4
C1177/C1177M Specification for Glass Mat Gypsum Substrate for Use as Sheathing
4
C1396 Specification for Gypsum Board
4
C1658/C1658M Specification for Glass Mat Gypsum Panels
3
E3090/E3090M Test Methods for Strength Properties of Metal Ceiling Suspension Systems
1
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 May 15, 2017Oct. 1, 2017. Published May 2017November 2017. Originally approved in 1991. Last previous edition approved in 2017 as
C1858 – 17. DOI: 10.1520/C1858-1710.1520/C1858-17A.
2
Annual ASTM Book of Standards,Vol.01.06.
4
Annual ASTM Book of Standards,Annual ASTM Book of StandardsVol.04.06.Vol.04.01.
3
Annual ASTM Book of StandardsAnnual ASTM Book of Standards,Vol.04.01.Vol.04.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
C1858 − 17a
3. Terminology
3.1 Definitions—Terms shall be as defined in Terminology C11.
3.2 Definitions of Terms Specific to This Standard:
3.2.1 counter sloping wire, n—opposing suspension wire intended to counteract the force of an out of plumb suspension wire
and maintain alignment of the system.
3.2.2 cross runner, n—the secondary support members or cross beams of a mechanical ceiling suspension system transferring
ceiling load to the main runner.
3.2.3 diaphragm, n—horizontal system acting to transmit lateral forces to the vertical resisting elements.
3.2.4 direct hung ceiling, n—load carrying ceiling components that are fastened directly to structure.
3.2.5 main runner, n—the primary or main beams (supports) of the ceiling
...