1、Designation: C635/C635M 17Standard Specification forManufacture, Performance, and Testing of Metal SuspensionSystems for Acoustical Tile and Lay-in Panel Ceilings1This standard is issued under the fixed designation C635/C635M; the number immediately following the designation indicates the yearof ori
2、ginal 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. Scope1.1 This specification covers metal ceiling suspension sys-tems us
3、ed primarily to support acoustical tile or acousticallay-in panels.1.2 Some suspension systems incorporate locking assemblydetails that enhance performance by providing some continuityor load transfer capability between adjacent sections of theceiling grid. The test methods of Test Methods E3090/E30
4、90Mreferenced in this specification do not provide the means formaking a complete evaluation of continuous beam systems, norfor assessing the continuity contribution to overall systemperformance. However, the test methods can be used forevaluating primary structural members in conjunction withsecond
5、ary members that interlock, as well as with those ofnoninterlocking type.1.3 While this specification is applicable to the exteriorinstallation of metal suspension systems, the atmosphericconditions and wind loading require additional design attentionto ensure safe implementation. For that reason, a
6、 specificreview and approval should be solicited from the responsiblearchitect and engineer, or both, for any exterior application ofmetal suspension systems in the construction of a new buildingor building modification.1.4 The values stated in either SI units or inch-pound unitsare to be regarded s
7、eparately as standard. The values stated ineach system may not be exact equivalents; therefore, eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 The following safety hazards caveat pertains only to thetest me
8、thods described in this specification. This standard doesnot purport to address all of the safety concerns, if any,associated with its use. It is the responsibility of the user of thisstandard to establish appropriate safety, health, and environ-mental practices and determine the applicability of re
9、gulatorylimitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recom-mendations issued by the World Trade
10、Organization TechnicalBarriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusD1735 Practice for Testing Water Resistance of CoatingsUsing Water Fog ApparatusE3090/E3090M Test Methods for Strength Properties ofMetal Ceiling S
11、uspension Systems3. Terminology3.1 Where these terms appear in this specification they shallhave the meaning herein indicated as follows:3.2 Definitions:3.2.1 backing board, na flat sheet of gypsum board towhich acoustical tile is attached using adhesive, screws,staples, or other suitable means (Fig
12、. 1c).3.2.2 bow, nthe maximum component of deviation in thevertical plane of a main runner, cross runner, or wall moldingwhere the centroidal axis of these structural components hasbeen permanently deformed from end to end into the shape ofa simple regular curve during the manufacturing process (Fig
13、.2).3.2.2.1 DiscussionThe meanings for bow and cambergiven here may differ from those applied elsewhere.3.2.3 camber, nthe maximum component of deviation inthe horizontal plane of a main runner, cross runner, or wallmolding where the centroidal axis of these structural compo-nents has been permanent
14、ly deformed from end to end into theshape of a simple regular curve during the manufacturingprocess (Fig. 2).1This specification is under the jurisdiction of ASTM Committee E33 onBuilding and Environmental Acoustics and is the direct responsibility of Subcom-mittee E33.04 on Application of Acoustica
15、l Materials and Systems.Current edition approved Sept. 1, 2017. Published September 2017. Originallyapproved in 1969. Last previous edition approved in 2013 as C635 13a. DOI:10.1520/C0635_C0635M-17.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service
16、at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United StatesThis international standard was developed in accor
17、dance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.118 3.2.4 carrying channel, nmeta
18、l section that supports theentire structural grid network in some forms of mechanicalceiling suspension systems (Fig. 1b).3.2.4.1 DiscussionThe carrying channels are usually sus-pended by hanger wires from the existing structure and themain runners are then attached to the channels.3.2.5 ceiling sus
19、pension system, nthe entire network orgrid of structural components, as defined by the ceilingsuspension system manufacturer, that provides support foracoustical ceiling tile, acoustical ceiling panels, lightingfixtures, flexible sprinkler hose fittings and air diffusers.3.2.6 cross runner, nthe sec
20、ondary or cross beams of amechanical ceiling suspension system (Fig. 1, a and b). Thecross runners usually support only the acoustical tile. In someforms of suspension systems, however, the cross runners alsoprovide support for lighting fixtures, air diffusers, and othercross runners.FIG. 1 Three Ty
21、pes of Ceiling Suspension Systems Showing All ComponentsC635/C635M 17218 3.2.7 hanger wire, nthe wire employed to suspend theacoustical ceiling from the existing structure (wood joists, steelbar joists, steel beams, concrete slabs, etc.) (Fig. 1).3.2.8 horizontal plane (of a structural component of
22、aceiling suspension system),na plane parallel to the plane ofthe ceiling which passes through the centroidal axis of themember (Fig. 2).3.2.9 interlocking, na ceiling system where the crossrunners are connected to the main runner or other crossrunners, or both, at intervals controlled by slots, hole
23、s, etc. inthe main runners.3.2.10 main runner, nthe primary or main beams of thetype of ceiling suspension system in which the structuralmembers are mechanically locked together (Fig. 1, a and b).The main runners provide direct support for cross runners, andmay support lighting fixtures and air diff
24、users. In addition, theacoustical tile may also be directly supported by the mainrunners. In some forms of mechanical ceiling suspensionsystems, the main runners are supported by hanger wiresattached directly to the existing structure. In other forms, themain runners (also referred to as “H” runners
25、, “Z” bars, etc.)are installed perpendicular to carrying channels and are sup-ported by specially designed sheet metal or wire clips attachedto the carrying channels.3.2.11 nailing bar or furring bar, nthe continuous sheetmetal strips to which a backing board is attached using eithernails or screws
26、(Fig. 1c). The nailing bars are installedperpendicular to and supported by the carrying channels.3.2.12 non-interlocking, na ceiling system that does notcomply with the specifications stated in the definition ofinterlocking.3.2.13 spline, na strip of metal or fiber inserted in thekerfs of adjacent a
27、coustical tile to form a concealed mechanicaljoint seal (Fig. 1b).3.2.14 twist, nthe angle of rotation measured in a trans-verse plane between the two end cross sections of a mainrunner, cross runner, or wall molding which has been perma-nently deformed during the process of manufacturing (Fig. 2).3
28、.2.15 vertical plane (of a structural component of a ceilingsuspension system),na plane perpendicular to the plane ofthe ceiling which passes through the centroidal axis of themember (Fig. 2).3.2.16 wall molding, nthe edge angles or channels of amechanical ceiling suspension system that are attached
29、 to awall (Fig. 1, a and b). The wall molding provides support forthe acoustical tile, main runners and cross runners that arelocated at the periphery of the ceiling.4. Classification4.1 The structural performance required from a ceilingsuspension system shall be defined by the specifying authorityi
30、n terms of a suspension system structural classification.FIG. 2 Diagrams Showing Camber, Bow, and TwistC635/C635M 17318 4.1.1 The structural classification of ceiling suspensionsystems shall be based on the load-carrying capacity of themain runners of the structural network. Load-carrying capacityas
31、 used herein is based on the more stringent requirement ofesthetic acceptance rather than the less confining prevention ofstructural failure. The criterion is the arbitrary but widelyestablished limit of deflection to1360 of the span betweensupports.4.1.2 The load-carrying capacity shall be the maxi
32、mumuniformly distributed load (pounds force per linear foot N/m)that a simply supported main runner section having a spanlength of 4 ft, 0 in. 1200 mm is capable of supporting withoutthe mid-span deflection exceeding 0.133 in. 3.33 mm or1360of the 4 ft, 0 in. 1200 mm span length, as tested in accord
33、ancewith Test Methods E3090/E3090M.4.1.3 The structural classification or grade of ceiling sus-pension systems shall be determined by the capability of mainrunners or nailing bars to support a uniformly distributed load.These classifications shall be:4.1.3.1 Light-Duty Systems, used where ceiling lo
34、ads otherthan acoustical tile or lay-in panels are not anticipated, such asresidential and light commercial structures.4.1.3.2 Intermediate-Duty Systems, used where ceilingloads other than acoustical tile or lay-in panels (light fixtures,air diffusers, etc.) are anticipated, such as ordinary commerc
35、ialstructures.4.1.3.3 Heavy-Duty Systems, used where the quantities andweights of ceiling fixtures (lights, air diffusers, etc.) are greaterthan those for an ordinary commercial structure.4.1.4 For the purpose of determining the structural classifi-cation of main runner members as covered in 4.1.2,
36、theirsimple-span, minimum load-carrying capabilities, when testedin accordance with the test method described in Test MethodsE3090/E3090M, shall be listed as shown in Table 1 and Table2.4.2 Cross runners shall be capable of carrying the loadspecified by the manufacturer without exceeding the maximum
37、allowable deflection equal to1360 of its span.4.3 The design and definition of the suspension system shallbe the responsibility of the manufacturer. Included is selectionof appropriate materials, metal thicknesses, dimensions ofnecessary component section configurations, design of specialhanger and
38、assembly devices, and provision for whateveraccessory items are needed to ensure satisfactory ceilingperformance within the scope of this specification.4.3.1 System manufacturers may provide supplementarydata describing load deflection capabilities of main runners ineach classification for spans oth
39、er than 4 ft 1200 mm.4.4 Where specialized loading conditions that are outsidethe scope of this specification exist, the manufacturer should beconsulted for his recommendations; and, he may furnishengineering data as required. Specification or design of super-structure anchors or fasteners are not t
40、he responsibility of theceiling system manufacturer unless specified by the ceilingsystem manufacturer as part of the suspension system.5. Dimensional Tolerance5.1 Suspension system structural members shall conform tothe following tolerance requirements:5.1.1 Metal Thickness:5.1.1.1 For steel system
41、s the thickness of metal used in mainrunners, cross runners, wall moldings, splines or nailing barsshall be stated by the suspension system manufacturer inpublished literature. The thickness in thousandths of an inchmm of metal and the allowable thickness variation for thecomponent shall be stated.5
42、.1.1.2 For aluminum systems the thickness of metal used inmain runners, cross runners, wall moldings, or splines shall bestated by the suspension system manufacturer in publishedliterature. The thickness in thousandths of an inch mm ofmetal and the allowable thickness variation for the componentshal
43、l be stated.5.1.2 Straightness:5.1.2.1 The amount of bow, camber, or twist in mainrunners, cross runners, wall molding, splines, or nailing bars ofvarious lengths shall not exceed the values shown in Table 3.5.1.2.2 Main runners, cross runners, wall moldings, splines,or nailing bars of ceiling suspe
44、nsion systems shall not containlocal kinks or bends.5.1.3 Length:5.1.3.1 The variation in the specified length of main runnersections or cross runner sections that are part of an interlockinggrid system shall not exceed 60.010 in./4 ft 0.25 mm/1200mm.TABLE 1 Minimum Load-Carrying Capabilities of Mai
45、n Runners - Inch/Pound UnitsSuspensionSystemDutyClassificationAppliedLoad (P)EquivalentUniformLoadAllowable MidspanDeflection (d)lbf lbf/ft in.Direct HungLight 5.0 5.0 0.133Intermediate 12.0 12.0 0.133Heavy 16.0 16.0 0.133Indirect HungLight 2.0 2.0 0.133Intermediate 3.5 3.5 0.133Heavy 8.0 8.0 0.133F
46、urring BarLight 4.5 4.5 0.133Intermediate 6.5 6.5 0.133Heavy . . .d=span/360C635/C635M 17418 5.1.3.2 The variation in the specified spacing of slots orother cutouts in the webs of main runners or cross runners thatare employed in assembling a ceiling suspension grid systemshall not exceed 60.010 in.
47、 0.25 mm.5.1.4 Over-all Cross-section Dimensions:5.1.4.1 For steel systems, the overall height of the crosssection of main runners, cross runners, wall molding, or nailingbar shall be the specified dimensions 60.030 in. 0.75 mm.The width of the cross section of exposed main runners or crossrunners s
48、hall be the specified dimension 60.008 in. 0.20 mm.5.1.4.2 For aluminum systems, the overall height of thecross section and the allowable variation of main runners, crossrunners, or wall molding shall be stated by the suspensionsystem manufacturer in published documentation. The widthand allowable v
49、ariation of the cross section of exposed mainrunners or cross runners shall be similarly stated.5.1.5 Section Squareness:5.1.5.1 Intersecting webs and flanges of structural members(“I,” “T,” or “Z” sections) shall form angles between them of90 6 2. If deviations from squareness at more than one suchintersection are additive with respect to their use in a ceiling,the total angle shall not be greater than 2.5.1.5.2 The ends of structural members that abut or intersectother members in exposed grid systems shall
