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� <br />i <br />FIELD TECHNICAL INFdRMATION <br />Applicafion recommendations lor work at fhe wall or ceiling <br />SUspension Systems for Acoustical Lay-in Ceilings <br />Seismic Design Categories D, E& F <br />This document has been revised <br />based on current Building Code <br />standards. In all buildings, other thar <br />structures classified as essential <br />facilities, suspended ceilings install� <br />in accordance with the prescriptiu: <br />provisions of the 401 document are <br />deemed to comply with the currenl <br />building code interpretation. <br />This document provides the IBC-20( <br />reterenced standards for the <br />installation of suspension systems <br />for acoustical lay-in ceilings. <br />Incorporation of this document will <br />provide a more uniform standard <br />for installation and inspection. This <br />document is designed to accomplish <br />the intent of the International <br />Building Code (IBC) with regard <br />to the requirements for seismic <br />design category D, E and F for <br />suspended ceilings and related items. <br />Unless supported by engineering, <br />the suspension system shall be <br />installed per these requirements. <br />Manufacturers' recorrimendations <br />should be followed where applicable. <br />IJORTHl7FST IVALL S CEIL�NG BUREAU <br />General Recommendations <br />• Re(erenced sources per hierarohy: 200918C Qnternational Building Cude), <br />American Society of Tesling Materials (ASTM C 635, ASTM G 636, ASTM <br />E 580/E 580M), American Sociery of Civil Engineers (ASCE 7-OS) and Ceil- <br />ings and Interior Systems Construction Association (CISCA). <br />• Partitions that are tied to the ceiling aod all partitions greater than 6 feel in <br />height shall be laterally breced to lhe structure. Bracing shall be indepen• <br />dent of the ceiling splay bracing syslem. =o��.��: nsce �-o>:,«uo�� �s.s.u.i <br />• For turther information on bracing of non-load bearing partitions refer to <br />NWCB technical documenl if200-501. <br />• All main beams are to be Heavy Dury (HD). sc:��: E: asce �-r,s sr:r.ua, i:_e�.s.zs � <br />• All cross tees shall be capable ot carrying lhe design load without sxceed- <br />ing defleclion equal to t/360 of its span. sou�co ciscti:w�cs �- � <br />ma�inum 3' <br />(]6mm; <br />ligu�e 1 <br />• These recommendations are intended <br />for suspended ceilings including grid, <br />panel or tile, light fixtures and air <br />terminals weighing no more the 4 Ibs. <br />per square toot. sc�.�a,: �sce 7-os ��r,no� <br />13 5.6.1 <br />• All vrire ties are to be three tight tums <br />around itself within three inches. Twelve <br />gage Hanger wire spaced 4 foot on cen- <br />lCf (fl9Ufe 1�. Source: ASTM1' C ti2E nen 2.9.d <br />• Changes in ceiling planes will require <br />positive bracing. <br />Scurcc: ASCE'-CS 175 0.?2/ <br />SUSPENSION SVSTEh15 FOR ACOUSTICAL LAV-IN CEILINGS / <br />5 <br />