1、Designation: C636/C636M 08C636/C636M 13Standard Practice forInstallation of Metal Ceiling Suspension Systems forAcoustical Tile and Lay-In Panels1This standard is issued under the fixed designation C636/C636M; the number immediately following the designation indicates the yearof original adoption or
2、, 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 Department of Defense.1. Scope1.
3、1 This practice covers the installation of suspension systems for acoustical tile and lay-in panels. It is applicable to contractorswhose services are utilized for installing acoustical ceilings and to other trades if their activities are responsible for interferencewith ceiling components or perfor
4、mance as defined in this recommended practice.1.2 While the practices described in this document have equal application to rated fire-resistive suspension systems, additionalrequirements may have been imposed to obtain the fire endurance classification of particular floor-ceiling or roof-ceilingasse
5、mblies. These details should be obtained from the manufacturers.1.3 Similarly, additional detailing may be necessary to meet sound attenuation requirements when ceiling plenums extend overcontiguous rooms. These, too, should be obtained from the manufacturer of the acoustical material employed.1.4 T
6、he values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in eachsystem may not be exact equivalents; therefore, each system shall be used independently of the other. Combining values from thetwo systems may result in non-conformance with th
7、e standard.1.5 While many of the practices described in this practice have application to the installation of metal suspension systems inexterior environments, the specific design of exterior ceiling installations requires the review and approval of the architect orengineer, or both, who are respons
8、ible for the construction of the building or modifications to an existing building. Whilerecommendations from the manufacturer should be solicited, it remains the final responsibility of the architect/engineer to ensureproper application of the materials in question.1.6 This standard does not purpor
9、t to address of the safety concerns, if any, associated with its use. It is the responsibility ofthe user of this standard to establish appropriate safety and health practices and determine the applicability of regulatorylimitations prior to use.2. Installation of Components2.1 Hangers:2.1.1 Where a
10、coustical ceilings are suspended from a structure of wood construction, attach hangers with suitable mechanicaldevices either to the bottom edge of the wood joists or to the vertical face of the wood joists near the bottom edge. Holding powertests certified by the manufacturer must be available on r
11、equest for bottom edge attachment devices.2.1.2 Where acoustical ceilings are suspended from a structure of concrete construction, mount hangers using cast-in-placehanger wires, hanger inserts, or other hanger attachment devices whose suitability has been demonstrated by standard constructionpractic
12、e or by certified test data.2.1.3 Space hangers for carrying channels or main runners 4 ft 0 in. 1200 mm on centers. If local situations allow greatercenter distances between hangers, reduce the load-carrying capacity of the ceiling suspension system commensurate with the actualcenter-to-center hang
13、er distances used. If local situations allow lesser center distances between hangers, increase the load-carryingcapacity of the ceiling suspension system commensurate with the actual center-to-center hanger distances used.2.1.4 Each suspension wire shall not hang more than one in six out of plumb un
14、less a countersloping wire or horizontal bracingis provided. See Fig. 1 for allowable countersloping methods. Suspension wires should not press against ducts or pipes.1 This practice is under the jurisdiction of ASTM Committee E33 on Building and Environmental Acoustics and is the direct responsibil
15、ity of Subcommittee E33.04 onApplication of Acoustical Materials and Systems.Current edition approved April 1, 2008April 1, 2013. Published April 2008May 2013. Originally approved in 1969. Last previous edition approved in 20062008 asC636 06.C636 08. DOI: 10.1520/C0636_C0636M-08.10.1520/C0636_C0636M
16、-13.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior
17、 editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1FIG. 1 Allowable Countersloping MethodsC636/
18、C636M 1322.1.5 Hangers formed from galvanized sheet metal stock shall be suitable for suspending carrying channels or main runnersfrom an existing structure provided that the hangers do not yield, twist, or undergo other objectionable movement.2.1.6 Wire hangers for suspending carrying channels or m
19、ain runners from an existing structure shall be prepared from aminimum of No. 12-gage 2.70 mm galvanized, soft-annealed, mild steel wire.2.1.7 In some installations hanger wires are secured to special attachment devices that support the carrying channels or mainrunners. Such attachment devices shall
20、 have certified load test data from an independent test laboratory and shall be capable ofcarrying five times the design load.2.2 Carrying Channels:2.2.1 Install the carrying channels so that they are all level to within 18 in. in 12 ft 3.2 mm in 3600 mm.2.2.2 Perform leveling with the supporting ha
21、ngers taut to prevent 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 wires as a means of leveling carrying channels.2.2.4 In installations where hanger wires are wrapped around carrying channels, the
22、wire loops shall be tightly formed to preventany vertical movement or rotation of the member within the loop.2.3 Main Runners:2.3.1 Install main runners so that they are all level to within 14 in. in 10 ft 6 mm in 3000 mm. Determine evaluation oflevelness from measurements taken below hanger points.
23、 Make the measurements after completion of the ceiling installations butprior to building occupancy.2.3.2 Where main runners are supported directly by hangers, perform leveling with the supporting hanger taut to prevent anysubsequent downward movement of the main runners when the ceiling loads are i
24、mposed.2.3.3 Local kinks or bends shall not be made in hanger wires as a means of leveling main runners.2.3.4 In installations where hanger wires are wrapped through or around main runners, the wire loops shall be tightly wrappedand sharply bent to prevent any vertical movement or rotation of the me
25、mber within the loops. The wire must be wrapped arounditself a minimum of three full turns (360 each) within a 3-in 75 mm. length. For safety purposes, the bottom of the hanger wiresshall either be cut close to the vertical portion of the wire or shall be bent upward parallel to the vertical portion
26、 of the hanger wire.See Fig. 2 for examples of each.2.3.5 When installing fire resistive main runners, all fire expansion relief cut outs in the main runner shall be installed withinthree inches of a vertical support hangar wire. Vertical support hangar wire spaced greater than three inches from fir
27、e expansionrelief cutouts is only permitted when the load performance has been evaluated at the greater distance.2.4 Cross Runners:2.4.1 Install cross runners supported by either main runners or by other cross runners to within 132 in. 0.80 mm of the requiredcenter distances. This tolerance shall be
28、 noncumulative 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 shall lie within a vertical distance of 0.015 in. 0.40 mm of each otherwith the abutting (cross) member always above the continuous (main) member.2.5 Splines
29、Splines used to form a concealed mechanical joint seal between adjacent tiles shall be compatible with the tile kerfdesign so that the adjacent tile will be horizontal when installed. Where splines are longer than the dimension between edges ofsupporting members running perpendicular to the splines,
30、 place the splines so that they rest either all above or all below the mainrunning members.2.6 Assembly Devices:2.6.1 Join abutting sections of main runner by means of suitable connections such as splices, interlocking ends, tab locks, pinlocks, and so forth. A joint connection shall be judged suita
31、ble both before and after ceiling loads are imposed if the joint providessufficient alignment so that the exposed surfaces of two abutting main runners lie within a vertical distance of 0.015 in. 0.40 mmof each other and within a horizontal distance of 0.015 in. 0.40 mm of each other.2.6.2 There sha
32、ll be no visually apparent angular displacement of the longitudinal axis of one runner with respect to the other.2.6.3 Assembly devices shall provide sufficient spacing control so that horizontal gaps between exposed surfaces of eitherabutting or intersecting members shall not exceed 0.020 in. 0.50
33、mm.2.6.4 Spring wire clips used for supporting main runners shall maintain tight contact between the main runners and the carryingchannels when the ceiling loads are imposed on the runners.2.7 Ceiling Fixtures:2.7.1 Mount fixtures installed in acoustical tile or lay-in panel ceilings in a manner tha
34、t will not compromise ceilingperformance.2.7.2 Fixtures shall not be supported from main runners or cross runners if the weight of the fixture causes the total dead loadto exceed the deflection capability of the ceiling suspension system. In such cases, the fixture load shall be supported bysuppleme
35、ntal hangers within 6 in. 150 mm of each corner, or the fixture shall be separately supported.C636/C636M 1332.7.3 Fixtures shall not be installed so that main runners or cross runners will be eccentrically loaded except where provisionis inherent in the system (or is separately provided for) to prev
36、ent undesirable section rotation or displacement, or both. In any case,runners supporting ceiling fixtures shall not rotate more than 2 after the fixture loads are imposed.2.7.4 Where fixture installation would produce rotation of runners in excess of 2, install fixtures with the use of suitableacce
37、ssory devices. These devices shall support the fixture in such a manner that main runners and cross runners will be loadedsymmetrically rather than eccentrically.3. Interference of Ceiling Related Components3.1 The specifier shall designate the type of suspension system to be employed and shall comm
38、unicate to all parties concernedthe necessary details of the acoustical ceiling to satisfactorily identify the number, size, spacing, location, and types of fixtures tobe accommodated in or above the ceiling.3.2 Prior to the beginning of ceiling work at a construction site, the ceiling contractor an
39、d other contractors whose work isrelated to the ceiling installation shall designate all areas of potential interference between ceiling components and componentsfrom other trades.3.3 All areas of interference that arise following the beginning of ceiling construction shall be reported by the contra
40、ctorsinvolved to the general contractor or the specifier, or both, as soon as the interference is observed.FIG. 2 Hanger Wire /Wire DetailC636/C636M 1344. Appearance4.1 Lighting:4.1.1 Where light from fixtures, cove lights, or high windows strikes the surface at a small angle, even slight unevenness
41、 ofjoints of acoustical tile may result in unsatisfactory appearance. Under such conditions beveled tile should be used in preferenceto square edge tile and installed with considerable care.4.1.2 The unfavorable appearance sometimes produced by edge lighting of ceilings suggests the desirability of
42、using flush orrecessed mounted lighting fixtures wherever this problem may be a critical one. Ceiling shadows cast by strong natural lightcoming through high windows also suggests the desirability of using tinted glass, blinds, or draperies to soften or diffuse the lightentering such openings.5. Ins
43、pection5.1 The inspection of specific ceiling areas for acceptability shall be made with lighting conditions corresponding to that of finalbuilding occupancy. If temporary lighting must be used, care shall be taken to position lights such that temporary conditions willapproximate the final lighting
44、condition.6. Keywords6.1 acoustical ceiling; acoustical tile; lay-in panels; metal ceiling 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
45、 expressly 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 r
46、evised, 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
47、may 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 S
48、tates. 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). Permission rights to photocopy the standard may also be secured from the ASTM website (www.astm.org/COPYRIGHT/).C636/C636M 135
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