Standard Specification for the Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings

ABSTRACT
This specification covers metal ceiling suspension systems used primarily to support acoustical tile or acoustical lay-in panels. Some suspension systems incorporate locking assembly details that enhance performance by providing some continuity or load transfer capability between adjacent sections of the ceiling grid. The structural classification or grade of ceiling suspension systems shall be determined by the capability of main runners or nailing bars to support a uniformly distributed load. These classifications shall be: light-duty systems; intermediate-duty systems; and heavy-duty systems. The structural classification of ceiling suspension systems shall be based on the load-carrying capacity of the main runners of the structural network. Suspension system structural members shall conform to the following tolerance requirements: metal thickness; straightness; length; overall cross-section dimensions; and section squareness.
SCOPE
1.1 This specification covers metal ceiling suspension systems used primarily to support acoustical tile or acoustical lay-in panels.
1.2 Some suspension systems incorporate locking assembly details that enhance performance by providing some continuity or load transfer capability between adjacent sections of the ceiling grid. The test methods included in this specification do not provide the means for making a complete evaluation of continuous beam systems, nor for assessing the continuity contribution to overall system performance. However, the test methods can be used for evaluating primary structural members in conjunction with secondary members that interlock, as well as with those of noninterlocking type.
1.3 While this specification is applicable to the exterior installation of metal suspension systems, the atmospheric conditions and wind loading require additional design attention to ensure safe implementation. For that reason, a specific review and approval should be solicited from the responsible architect and engineer, or both, for any exterior application of metal suspension systems in the construction of a new building or building modification.
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 following safety hazards caveat pertains only to the test methods described in this specification. 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 and health practices and determine the applicability of regulatory limitations prior to use.

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30-Sep-2007
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ASTM C635/C635M-07 - Standard Specification for the Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings
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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: C635/C635M −07
StandardSpecification for
the Manufacture, Performance, and Testing of Metal
Suspension Systems for Acoustical Tile and Lay-in Panel
1
Ceilings
This standard is issued under the fixed designation C635/C635M; the number immediately following the designation indicates the year
of original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.
A superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope standard to establish appropriate safety and health practices
and determine the applicability of regulatory limitations prior
1.1 This specification covers metal ceiling suspension sys-
to use.
tems used primarily to support acoustical tile or acoustical
lay-in panels.
2. Referenced Documents
2
1.2 Some suspension systems incorporate locking assembly
2.1 ASTM Standards:
detailsthatenhanceperformancebyprovidingsomecontinuity
B117Practice for Operating Salt Spray (Fog) Apparatus
or load transfer capability between adjacent sections of the
ceiling grid. The test methods included in this specification do 3. Terminology
not provide the means for making a complete evaluation of
3.1 Definitions:
continuous beam systems, nor for assessing the continuity
3.1.1 Where these terms appear in this specification they
contribution to overall system performance. However, the test
shall have the meaning herein indicated as follows:
methods can be used for evaluating primary structural mem-
3.1.1.1 backing board— a flat sheet of gypsum board to
bers in conjunction with secondary members that interlock, as
which acoustical tile is attached using adhesive, screws,
well as with those of noninterlocking type.
staples, or other suitable means (Fig. 1c).
1.3 While this specification is applicable to the exterior 3.1.1.2 bow—the maximum component of deviation in the
installation of metal suspension systems, the atmospheric vertical plane of a main runner, cross runner, or wall molding
conditionsandwindloadingrequireadditionaldesignattention where the centroidal axis of these structural components has
to ensure safe implementation. For that reason, a specific been permanently deformed from end to end into the shape of
review and approval should be solicited from the responsible
a simple regular curve during the manufacturing process (Fig.
architect and engineer, or both, for any exterior application of 2).
metalsuspensionsystemsintheconstructionofanewbuilding
NOTE1—Themeaningsfor bowand cambergivenheremaydifferfrom
or building modification.
those applied elsewhere.
1.4 The values stated in either SI units or inch-pound units
3.1.1.3 camber—the maximum component of deviation in
are to be regarded separately as standard. The values stated in
the horizontal plane of a main runner, cross runner, or wall
each system may not be exact equivalents; therefore, each
molding where the centroidal axis of these structural compo-
system shall be used independently of the other. Combining
nents has been permanently deformed from end to end into the
values from the two systems may result in non-conformance
shape of a simple regular curve during the manufacturing
with the standard.
process (Fig. 2).
3.1.1.4 carrying channel or hanging channel—the three-
1.5 The following safety hazards caveat pertains only to the
sided or “[”-shaped metal sections that support the entire
testmethodsdescribedinthisspecification. This standard does
structural grid network in some forms of mechanical ceiling
not purport to address all of the safety concerns, if any,
suspension systems (Fig. 1b). The carrying channels are
associated with its use. It is the responsibility of the user of this
usually suspended by hanger wires from the existing structure
and the main runners are then attached to the channels.
1
This specification is under the jurisdiction of ASTM Committee E33 on
Building and Environmental Acoustics and is the direct responsibility of Subcom-
2
mittee E33.04 on Application of Acoustical Materials and Systems. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved Oct. 1, 2007. Published October 2007. Originally contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
approved in 1969. Last previous edition approved in 2004 as C635–04. DOI: Standards volume information, refer to the standard’s Document Summary page on
10.1520/C0635_C0635M-07. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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C635/C635M − 07
FIG. 1 Three Types of Ceiling Suspension Systems Showing All Components
3.1.1.5 ceiling
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