ASTM_C_636_-_C_636M_-_13.pdf

Designation:C636/C636M13Standard 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,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 practice 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 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.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 stated 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 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 constructionof 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 the 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 are 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 edge 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 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.If 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 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 that 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.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 certified1This practice is under the jurisdiction 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 1,2013.Published May 2013.Originallyapproved in 1969.Last previous edition approved in 2008 as C636 08.DOI:10.1520/C0636_C0636M-13.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 FIG.1 A