1、Designation: C635/C635M 13aStandard Specification forthe Manufacture, Performance, and Testing of MetalSuspension Systems for Acoustical Tile and Lay-in PanelCeilings1This standard is issued under the fixed designation C635/C635M; the number immediately following the designation indicates the yearof
2、 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.This standard has been approved for use by agencies of the U.S. Depart
3、ment of Defense.1. Scope1.1 This specification covers metal ceiling suspension sys-tems used 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 capabilit
4、y between adjacent sections of theceiling grid. The test methods included in this specification donot provide the means for making a complete evaluation ofcontinuous beam systems, nor for assessing the continuitycontribution to overall system performance. However, the testmethods can be used for eva
5、luating primary structural mem-bers in conjunction with secondary members that interlock, aswell as with those of noninterlocking type.1.3 While this specification is applicable to the exteriorinstallation of metal suspension systems, the atmosphericconditions and wind loading require additional des
6、ign attentionto ensure safe implementation. For that reason, a 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 sta
7、ted in either SI units or inch-pound unitsare to be regarded separately 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 T
8、he following safety hazards caveat pertains only to thetest methods 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 and health pr
9、acticesand determine the applicability of regulatory limitations priorto use.2. Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray (Fog) ApparatusD1735 Practice for Testing Water Resistance of CoatingsUsing Water Fog Apparatus3. Terminology3.1 Definitions:3.1.1 Where thes
10、e terms appear in this specification theyshall have the meaning herein indicated as follows:3.1.1.1 backing boarda flat sheet of gypsum board towhich acoustical tile is attached using adhesive, screws,staples, or other suitable means (Fig. 1c).3.1.1.2 bowthe maximum component of deviation in thevert
11、ical 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.2).NOTE 1The meanings for bow and camber given here may differ
12、 fromthose applied elsewhere.3.1.1.3 camberthe 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 permanently deformed from end to end into theshape of a simple regular curve during t
13、he manufacturingprocess (Fig. 2).3.1.1.4 carrying channel or hanging channelthe three-sided or “”-shaped metal sections that support the entirestructural grid network in some forms of mechanical ceiling1This specification is under the jurisdiction of ASTM Committee E33 onBuilding and Environmental A
14、coustics and is the direct responsibility of Subcom-mittee E33.04 on Application of Acoustical Materials and Systems.Current edition approved Sept. 1, 2013. Published December 2013. Originallyapproved in 1969. Last previous edition approved in 2013 as C635 13. DOI:10.1520/C0635_C0635M-13A.2For refer
15、enced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service 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
16、Conshohocken, PA 19428-2959. United States1suspension systems (Fig. 1b). The carrying channels areusually suspended by hanger wires from the existing structureand the main runners are then attached to the channels.3.1.1.5 ceiling suspension systemthe entire network orgrid of structural components, a
17、s defined by the ceilingsuspension system manufacturer, that provides support forFIG. 1 Three Types of Ceiling Suspension Systems Showing All ComponentsC635/C635M 13a2acoustical ceiling tile, acoustical ceiling panels, lightingfixtures, and air diffusers.3.1.1.6 cross runnerthe secondary or cross be
18、ams 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.3.1.1.7 hanger wirethe wire emplo
19、yed to suspend theacoustical ceiling from the existing structure (wood joists, steelbar joists, steel beams, concrete slabs, etc.) (Fig. 1).3.1.1.8 horizontal plane (of a structural component of aceiling suspension system)a plane parallel to the plane of theceiling which passes through the centroida
20、l axis of the member(Fig. 2).3.1.1.9 interlockinga ceiling system where the cross run-ners are connected to the main runner or other cross runners, orboth, at intervals controlled by slots, holes, etc. in the mainrunners.3.1.1.10 main runnerthe primary or main beams of thetype of ceiling suspension
21、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 diffusers. In addition, theacoustical tile may also be directly supported by the mainrunners. In some forms of
22、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, “Z” bars, etc.)are installed perpendicular to carrying channels and are sup-ported by specially designed
23、sheet metal or wire clips attachedto the carrying channels.3.1.1.11 nailing bar or furring barthe continuous sheetmetal strips to which a backing board is attached using eithernails or screws (Fig. 1c). The nailing bars are installedperpendicular to and supported by the carrying channels.3.1.1.12 no
24、n-interlockinga ceiling system that does notcomply with the specifications stated in the definition ofinterlocking.3.1.1.13 splinea strip of metal or fiber inserted in the kerfsof adjacent acoustical tile to form a concealed mechanical jointseal (Fig. 1b).3.1.1.14 twistthe angle of rotation measured
25、 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).3.1.1.15 vertical plane (of a structural component of aceiling suspension system)a plane perpendicular to the pl
26、aneof the ceiling which passes through the centroidal axis of themember (Fig. 2).3.1.1.16 wall molding the edge angles or channels of amechanical ceiling suspension system that are attached to awall (Fig. 1, a and b). The wall molding provides support forthe acoustical tile, main runners and cross r
27、unners that arelocated at the periphery of the ceiling.FIG. 2 Diagrams Showing Camber, Bow, and TwistC635/C635M 13a34. Classification4.1 The structural performance required from a ceilingsuspension system shall be defined by the specifying authorityin terms of a suspension system structural classifi
28、cation.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 used herein is based on the more stringent requirement ofesthetic acceptance rather than the less confining prev
29、ention 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 maximumuniformly distributed load (pounds per linear foot N/m) thata simply supported main runner section having a sp
30、an length of4 ft, 0 in. 1200 mm is capable of supporting without themid-span deflection exceeding 0.133 in. 3.33 mm or1360 ofthe 4 ft, 0 in. 1200 mm span length, as tested in accordancewith the method described in Section 8.4.1.3 The structural classification or grade of ceiling sus-pension systems
31、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 loads otherthan acoustical tile or lay-in panels are not anticipated, such asresidential and light commercial str
32、uctures.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 commercialstructures.4.1.3.3 Heavy-Duty Systems, used where the quantities andweights of ceiling fixtures (lights, air
33、 diffusers, etc.) are greaterthan those for an ordinary commercial structure.FIG. 3 Load-Carrying Test Configuration for Inch/Pound UnitsFIG. 4 Load-Carrying Test Configuration for Inch/Pound UnitsC635/C635M 13a44.1.4 For the purpose of determining the structural classifi-cation of main runner membe
34、rs as covered in 4.1.2, theirsimple-span, minimum load-carrying capabilities, when testedin accordance with the test method described in Section 10,shall be listed as shown in Table 1 and Table 2.4.2 Cross runners shall be capable of carrying the loadspecified by the manufacturer without exceeding t
35、he maximumallowable 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 specialh
36、anger and 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
37、 spans other 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
38、 are not the 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 st
39、eel systems 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 inch ofmetal and the allowable thickness variation for the componentshall be s
40、tated.5.1.1.2 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 of metal andthe allowable thickness variation for the component
41、 shall bestated.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 s
42、uspension 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.5.1.3.2 The variation in the specified spacin
43、g 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. 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
44、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 shall 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
45、variation of main runners, crossrunners, or wall molding shall be stated by the suspensionsystem manufacturer in published literature and price lists. Thewidth and allowable variation of the cross section of exposedmain runners or cross runners shall be similarly stated.5.1.5 Section Squareness:5.1.
46、5.1 Intersecting webs and flanges of structural members(“I”,“ T”, or “Z” sections) shall form angles between them of906 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
47、of structural members that abut or intersectother members in exposed grid systems shall be cut perpen-dicular to the exposed face, 90 + 0, 2.5.2 Suspension system assembly devices shall satisfy thefollowing requirements and tolerances.5.2.1 The design of and dimensional tolerances set by themanufact
48、urer for accessory items such as formed wire hangers,spring spacer clips, tile retainers, and spacer bars shall be suchTABLE 1 Minimum Load-Carrying Capabilities of Main Runners - Inch/Pound UnitsSuspensionSystemDutyClassificationAppliedLoad (P)EquivalentUniformLoadAllowable MidspanDeflection (d)lb
49、lb/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 0.133Furring BarLight 4.5 4.5 0.133Intermediate 6.5 6.5 0.133Heavy . . .d=span/360C635/C635M 13a5as to ensure satisfactory performance of their intended functionin the suspension system. Failure attributable to such accesso-ries to control alignment, prevent undesirable rotation, or otherunsatisfactory performance that results in unfavorable acous-tical tile ceiling appearanc
