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ASTM C635/C635M-07

(Specification)

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

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.

General Information

Status
Historical
Publication Date
30-Sep-2007
ICS
91.120.20 - Acoustics in building. Sound insulation
Technical Committee
E33 - Building and Environmental Acoustics
Drafting Committee
E33.04 - Application of Acoustical Materials and Systems
Current Stage
Ref Project

Relations

Replaces
ASTM C635-04 - Standard Specification for the Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings
Effective Date
01-Oct-2007
Replaced By
ASTM C635/C635M-12 - Standard Specification for the Manufacture, Performance, and Testing of Metal Suspension Systems for Acoustical Tile and Lay-in Panel Ceilings
Effective Date
15-Oct-2012
Referred By
ASTM E3118/E3118M-22 - Standard Test Methods to Evaluate Seismic Performance of Suspended Ceiling Systems by Full-Scale Dynamic Testing
Effective Date
01-Oct-2007
Referred By
ASTM C634-22 - Standard Terminology Relating to Building and Environmental Acoustics
Effective Date
01-Oct-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 CeilingsASTM 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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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

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

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1.1 This test method covers the laboratory measurement of impact sound transmission of floor-ceiling assemblies using a standardized tapping machine. It is assumed that the test specimen constitutes the primary sound transmission path into a receiving room located directly below and that a good approximation to a diffuse sound field exists in this room.  
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5.1 The acoustical impedance properties of a sound absorptive material are related to its physical properties, such as airflow resistance, porosity, elasticity, and density. As such, the measurements described in this test method are useful in basic research and product development of sound absorptive materials.  
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1.1 This test method covers the use of an impedance tube, alternatively called a standing wave apparatus, for the measurement of impedance ratios and the normal incidence sound absorption coefficients of acoustical materials.  
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.  
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SIGNIFICANCE AND USE
5.1 The specific airflow resistance of an acoustical material is one of the properties that determine its sound-absorptive and sound-transmitting properties. Measurement of specific airflow resistance is useful during product development, for quality control during manufacture, and for specification purposes.  
5.2 Valid measurements are made only in the region of laminar airflow where, aside from random measurement errors, the airflow resistance (R = P/U) is constant. When the airflow is turbulent, the apparent airflow resistance increases with an increase of volume velocity and the term “airflow resistance” does not apply.  
5.3 The specific airflow resistance measured by this test method may differ from the specific resistance measured by the impedance tube method in Test Method E384 for two reasons. In the presence of sound, the particle velocity inside a porous material is alternating while in this test method, the velocity is constant and in one direction only. Also, the particle velocity inside a porous material is not the same as the linear velocity measured outside the specimen.
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cgs acoustic ohm  
mks acoustic ohm (Pa·s/m3)  
105  
cgs rayl  
mks rayl (Pa·s/m)  
10    
cgs rayl/cm  
mks rayl/m (Pa·s/m2)  
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cgs rayl/in.  
mks rayl/m (Pa·s/m2)  
394  
mks rayl/in.  
mks rayl/m (Pa·s/m2)  
39.4  
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ASTM E1573-22(Test Method)
Standard Test Method for Measurement and Reporting of Masking Sound Levels Using A-Weighted and One-Third-Octave-Band Sound Pressure Levels

SIGNIFICANCE AND USE
5.1 Acoustical performance is dependent on many factors (see Guide E1374 for a discussion on general office acoustical considerations). One of these factors is the masking sound. The masking spectrum shape and level must conform within specified tolerances throughout the treated area. The measurement and recording of these parameters are addressed in this test method.  
5.2 The results from this test method are used to determine if the masking sound meets a particular specification.
SCOPE
1.1 This test method specifies the procedure used to measure the masking sound in terms of A-weighted and one-third-octave-band sound pressure levels.  
1.2 The results of this test method can be used to determine if and where the masking sound meets (or does not meet) a particular specification.  
1.3 This test method does not evaluate the overall acoustical environment. It is intended only to measure and report the masking sound levels.  
1.4 The values stated in SI units are to be regarded as standard. The values in parentheses are for information only.  
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.

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