1、Designation: C 636/C 636M 08Standard Practice forInstallation of Metal Ceiling Suspension Systems forAcoustical Tile and Lay-In Panels1This standard is issued under the fixed designation C 636/C 636M; the number immediately following the designation indicates the yearof original adoption or, in the
2、case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval.A superscript epsilon (e) 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. Scope1.1 This p
3、ractice covers the installation of suspension sys-tems for acoustical tile and lay-in panels. It is applicable tocontractors whose services are utilized for installing acousticalceilings and to other trades if their activities are responsible forinterference with ceiling components or performance as
4、 de-fined in this recommended practice.1.2 While the practices described in this document haveequal application to rated fire-resistive suspension systems,additional requirements may have been imposed to obtain thefire endurance classification of particular floor-ceiling or roof-ceiling assemblies.
5、These details should be obtained from themanufacturers.1.3 Similarly, additional detailing may be necessary to meetsound attenuation requirements when ceiling plenums extendover contiguous rooms. These, too, should be obtained fromthe manufacturer of the acoustical material employed.1.4 The values s
6、tated 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
7、 While many of the practices described in this practicehave application to the installation of metal suspension systemsin exterior environments, the specific design of exterior ceilinginstallations requires the review and approval of the architector engineer, or both, who are responsible for the con
8、structionof the building or modifications to an existing building. Whilerecommendations from the manufacturer should be solicited, itremains the final responsibility of the architect/engineer toensure proper application of the materials in question.1.6 This standard does not purport to address of th
9、e safetyconcerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use.2. Installation of Components2.1 Hangers:2.1.1 Where acoustical ceilings a
10、re suspended from a struc-ture of wood construction, attach hangers with suitable me-chanical devices either to the bottom edge of the wood joists orto the vertical face of the wood joists near the bottom edge.Holding power tests certified by the manufacturer must beavailable on request for bottom e
11、dge attachment devices.2.1.2 Where acoustical ceilings are suspended from a struc-ture of concrete construction, mount hangers using cast-in-place hanger wires, hanger inserts, or other hanger attachmentdevices whose suitability has been demonstrated by standardconstruction practice or by certified
12、test data.2.1.3 Space hangers for carrying channels or main runners 4ft 0 in. 1200 mm on centers. If local situations allow greatercenter distances between hangers, reduce the load-carryingcapacity of the ceiling suspension system commensurate withthe actual center-to-center hanger distances used. I
13、f localsituations allow lesser center distances between hangers, in-crease the load-carrying capacity of the ceiling suspensionsystem commensurate with the actual center-to-center hangerdistances used.2.1.4 Each suspension wire shall not hang more than one insix out of plumb unless a countersloping
14、wire or horizontalbracing is provided. See Fig. 1 for allowable counterslopingmethods. Suspension wires should not press against ducts orpipes.2.1.5 Hangers formed from galvanized sheet metal stockshall be suitable for suspending carrying channels or mainrunners from an existing structure provided t
15、hat the hangers donot yield, twist, or undergo other objectionable movement.2.1.6 Wire hangers for suspending carrying channels ormain runners from an existing structure shall be prepared froma minimum of No. 12-gage 2.70 mm galvanized, soft-annealed, mild steel wire.1This practice is under the juri
16、sdiction of ASTM Committee E33 on Buildingand Environmental Acoustics and is the direct responsibility of SubcommitteeE33.04 on Application of Acoustical Materials and Systems.Current edition approved April 1, 2008. Published April 2008. Originallyapproved in 1969. Last previous edition approved in
17、2006 as C 636 06.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.2.1.7 In some installations hanger wires are secured tospecial attachment devices that support the carrying channelsor main runners. Such attachment devices shall have
18、certifiedload test data from an independent test laboratory and shall becapable of carrying five times the design load.2.2 Carrying Channels:2.2.1 Install the carrying channels so that they are all levelto within18 in. in 12 ft 3.2 mm in 3600 mm.2.2.2 Perform leveling with the supporting hangers tau
19、t toprevent any subsequent downward movement of the carryingchannels when the ceiling loads are imposed.2.2.3 Local kinks or bends shall not be made in hanger wiresas a means of leveling carrying channels.2.2.4 In installations where hanger wires are wrappedaround carrying channels, the wire loops s
20、hall be tightlyformed to prevent any vertical movement or rotation of themember within the loop.2.3 Main Runners:2.3.1 Install main runners so that they are all level to within14 in. in 10 ft 6 mm in 3000 mm. Determine evaluation oflevelness from measurements taken below hanger points. MakeFIG. 1 Al
21、lowable Countersloping MethodsC 636/C 636M 082the measurements after completion of the ceiling installationsbut prior to building occupancy.2.3.2 Where main runners are supported directly by hang-ers, perform leveling with the supporting hanger taut to preventany subsequent downward movement of the
22、main runnerswhen the ceiling loads are imposed.2.3.3 Local kinks or bends shall not be made in hanger wiresas a means of leveling main runners.2.3.4 In installations where hanger wires are wrappedthrough or around main runners, the wire loops shall be tightlywrapped and sharply bent to prevent any v
23、ertical movement orrotation of the member within the loops. The wire must bewrapped around itself a minimum of three full turns (360each) within a 3-in 75 mm. length. For safety purposes, thebottom of the hanger wires shall either be cut close to thevertical portion of the wire or shall be bent upwa
24、rd parallel tothe vertical portion of the hanger wire. See Fig. 2 for examplesof each.2.3.5 When installing fire resistive main runners, all fireexpansion relief cut outs in the main runner shall be installedwithin three inches of a vertical support hangar wire. Verticalsupport hangar wire spaced gr
25、eater than three inches from fireexpansion relief cutouts is only permitted when the loadperformance has been evaluated at the greater distance.2.4 Cross Runners:2.4.1 Install cross runners supported by either main runnersor by other cross runners to within132 in. 0.80 mm of therequired center dista
26、nces. This tolerance shall be noncumula-tive beyond 12 ft 3600 mm.2.4.2 Intersecting runners shall form a right angle.2.4.3 The exposed surfaces of two intersecting runners shalllie within a vertical distance of 0.015 in. 0.40 mm of eachother with the abutting (cross) member always above thecontinuo
27、us (main) member.2.5 SplinesSplines used to form a concealed mechanicaljoint seal between adjacent tiles shall be compatible with theFIG. 2 Hanger Wire /Wire DetailC 636/C 636M 083tile kerf design so that the adjacent tile will be horizontal wheninstalled. Where splines are longer than the dimension
28、 betweenedges of supporting members running perpendicular to thesplines, place the splines so that they rest either all above or allbelow the main running members.2.6 Assembly Devices:2.6.1 Join abutting sections of main runner by means ofsuitable connections such as splices, interlocking ends, tabl
29、ocks, pin locks, and so forth. A joint connection shall bejudged suitable both before and after ceiling loads are imposedif the joint provides sufficient alignment so that the exposedsurfaces of two abutting main runners lie within a verticaldistance of 0.015 in. 0.40 mm of each other and within aho
30、rizontal distance of 0.015 in. 0.40 mm of each other.2.6.2 There shall be no visually apparent angular displace-ment of the longitudinal axis of one runner with respect to theother.2.6.3 Assembly devices shall provide sufficient spacingcontrol so that horizontal gaps between exposed surfaces ofeithe
31、r abutting or intersecting members shall not exceed 0.020in. 0.50 mm.2.6.4 Spring wire clips used for supporting main runnersshall maintain tight contact between the main runners and thecarrying channels when the ceiling loads are imposed on therunners.2.7 Ceiling Fixtures:2.7.1 Mount fixtures insta
32、lled in acoustical tile or lay-inpanel ceilings in a manner that will not compromise ceilingperformance.2.7.2 Fixtures shall not be supported from main runners orcross runners if the weight of the fixture causes the total deadload to exceed the deflection capability of the ceiling suspen-sion system
33、. In such cases, the fixture load shall be supportedby supplemental hangers within 6 in. 150 mm of each corner,or the fixture shall be separately supported.2.7.3 Fixtures shall not be installed so that main runners orcross runners will be eccentrically loaded except where provi-sion is inherent in t
34、he system (or is separately provided for) toprevent undesirable section rotation or displacement, or both.In any case, runners supporting ceiling fixtures shall not rotatemore than 2 after the fixture loads are imposed.2.7.4 Where fixture installation would produce rotation ofrunners in excess of 2,
35、 install fixtures with the use of suitableaccessory devices. These devices shall support the fixture insuch a manner that main runners and cross runners will beloaded symmetrically rather than eccentrically.3. Interference of Ceiling Related Components3.1 The specifier shall designate the type of su
36、spensionsystem to be employed and shall communicate to all partiesconcerned the necessary details of the acoustical ceiling tosatisfactorily identify the number, size, spacing, location, andtypes of fixtures to be accommodated in or above the ceiling.3.2 Prior to the beginning of ceiling work at a c
37、onstructionsite, the ceiling contractor and other contractors whose work isrelated to the ceiling installation shall designate all areas ofpotential interference between ceiling components and compo-nents from other trades.3.3 All areas of interference that arise following the begin-ning of ceiling
38、construction shall be reported by the contractorsinvolved to the general contractor or the specifier, or both, assoon as the interference is observed.4. Appearance4.1 Lighting:4.1.1 Where light from fixtures, cove lights, or high win-dows strikes the surface at a small angle, even slight uneven-ness
39、 of joints of acoustical tile may result in unsatisfactoryappearance. Under such conditions beveled tile should be usedin preference to square edge tile and installed with considerablecare.4.1.2 The unfavorable appearance sometimes produced byedge lighting of ceilings suggests the desirability of us
40、ing flushor recessed mounted lighting fixtures wherever this problemmay be a critical one. Ceiling shadows cast by strong naturallight coming through high windows also suggests the desir-ability of using tinted glass, blinds, or draperies to soften ordiffuse the light entering such openings.5. Inspe
41、ction5.1 The inspection of specific ceiling areas for acceptabilityshall be made with lighting conditions corresponding to that offinal building occupancy. If temporary lighting must be used,care shall be taken to position lights such that temporaryconditions will approximate the final lighting cond
42、ition.6. Keywords6.1 acoustical ceiling; acoustical tile; lay-in panels; metalceiling suspension system; suspension systemsASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expr
43、essly advised that determination of the validity of any such patent rights, and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revise
44、d, either reapproved or withdrawn. Your comments are invited either for revision of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may
45、attend. If you feel that your comments have not received a fair hearing you shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).C 636/C 636M 084
