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Plans OU o © I 78' • • 1 : 2 _ 7 5 o s v✓ 6 g\'--. 0 EXISTING JOISTS n U O f? �� • O \\ / 3 Ya' 25 ga. MIN. STEEL STUD ANCHORED TO MIN. OF 3 ROOF JOISTS I? / / EXISTING SUSPENDED CEIUNG SYSTEM co Q [ 1 3 % °, 25 ga. STEEL STUD BRACES SPACED AT 4'-0' O.0 , ATTACHED TO TOP OF WALL & HORIZONTAL STUD W! MINIMUM OF 2 -1' LONG N I SELF - DRILLING, SELF TAPPING STEEL SCREWS. o ( o - O N - • - _ (1) LAYER % GYPSUM rn BOARD EACH SIDE. 0) , � U- CHANNEL o USE RAMSET FASTENER v TO SECURE BOTTOM TRACK TO EXISTING CONCRETE FLR. rn U) CONCRETE FLOOR SLAB. 0 C 0 CL. U) a, IL 0 m U 0 a) a > _ _ PARTITION DETAIL DATE: 9/24/09 cp PACIFIC DENTAL INSTITUTE ClearChoice 12570 SW 68TH AVE w DENTAL IMPLANT CENTERS TIGARD, OREGON 97223 f0 a, CC • !"... ' ''- -7 - 1444110- • ■i _.--__....Ag i --", . ; ...:.-- ,,z:::: ,:-_-.2 ,-zv-_- -. , ...,47e __,;- Fri ri. ...„ iE.... „ .,... ......, , „ . r s 7 .‘ r ' :•--..,21-,. - - .•/..„..." - _ri piirp. .1_, ..c L.: 1=_J I ..-: : - - - - ;";, - ,z.1 11 1..... ' ' I -,-:- i - ..0..e , - - r,' , - -- . 5,- - - _ _ ,--:::_lia,,,,_%-.1.1-,=:11=-t.... 7. _ -....., , 1 •••,..‹... , ...- 1 ,... 1 1„. ....., : i • : . 1 * -4 Drywall Nonload-Bearing (Nonstructural) Studs (UST-Sen'esn) ,, . ,, i : -, - ,,. il Featuring UltraSTEEL® Framing Technology Roll-formed from corrosion-resistant galvanized steel that conforms to ASTM C 645 ,.,4, - Pre-punched knockouts for easy installation of electrical, plumbing and bridging Available sizes: 1 2 3 3 4" 5 and 6" Available gauges: 25 EQ, 20 DW EQ and 20 STR EQ* EQ = equivalent to traditional stud gauges r .....„.„,..„ * Available in limited markets - 1 .vafst..1---..2d'.!..1 Drywall UltraSTEEL' (nonload-bearing) e. . b Interior studs are used in nonload-bearing ,5, .•,-&).-": . - - . - , (nonstructural) interior wall systems or "."51V'' - ' • ....--::-=;;I:P. "eV : partitions ...,.... ., . - . ... titions that support gypsum vrallboard ...• .,-..-,-; • - - ,,,,,..... --....w, construction. Drywall metal studs are ..-..,„1 . .• -- - . .,-'`Ativ Ft , ri. A available .; :"- - /- . -1 .. • - 1:" f-'=,1%'.,' , ...;01 R3 vailable in 25 Gauge a.;;;;,4,•-14.v.:•.--4,-, e EQ (equivalent) - ei'l--TZ';'si --. • : ' - -- ' 1:;" ,- 041 . '‘ 7 "., - -- 20 DW Gauge EQ (equivalent) and ,. -..- -. - , . ' - - • -' ..,...r,;;;;;J-i • _ ,,. . - .-..- c .- . .: ,s2F7A, . - , - . 4,,.. - • ....i Gauge EQ (equivalent) ..r 0 20 STR thickness* 17. • -- - ' - • '-,:-.:7;: ---47- . -t : 0`.4? - 16..- - _. : .`;:' Z cif,f4,•.-.0 • - . ..• , . - -4 . ....', 'L.:~ : ‘ - - and are manufactured utilizing r'-`, r- • - - - .= - --2 --.-,-?,..vc:=:, -- ---4.??:st, Ultra order to determine the proper gauge, wall STEEL' framing technology. In o --- ' -- -- • .. ' ..' '---:-:';-Vr ”• -1: • - .7. g..': 1-70 -..41..tg„,:•••,:,- .t... height, stud spacing, deflection limitations Drywall Stud and lateral loading must all be considered. 16 Studs are available in a variety of web sizes and can be ordered in stock and custom lengths. Metal studs are twisted into the top and • I.@ bottom truth and either friction fit, crimped or screw attached at 12", 16" or 24" on center spacing. V In contrast to wood studs, metal studs will not warp, twist or bow resulting in straighter walls free from cracks and nail pops. Metal studs are impervious to insects, mold and rot. They are noncombustible and will not add fuel to a fire. UItraSTEELe Drywall Nonload-Bearing (Nonstructural) Studs (UST-Series") DMF Base Metal Effective Metal Size Weight Packaging Member Gauge Product Thickness Thickness' Inches ibs/ft kg/m POE! POE, Designation Equilivent mm Code (Inches) (Inches) Bundle Skid 162 USTN 0.015 0.034 1-5/8 41.3 0.239 0.355 480 150 USTN '0 015 -,' 7 -- '-,- - - - 2:1/2'• . .63.54 '-'• .2'0286' -: '' 0425 ' -' '480 - 1 „......... __„-_, USTN 362 USTN 25 EQ 0.015 0.034 3 92.1 0.347 0.516 10 360 400 USTN - 0 015 ! ; -- ' 0 034 ---- - -' 4 '- --- 101 6 = - ---- 0.367 -'• -0.546 • ' '360 =- 600 USTN 0.015 0.034 6 152.4 0.474 0.705 180 162 USTE 0.025 0.055 1-5/8 41.3 0.390 0.580 480 -250 ILISTE;. -: 0025 ---:, 0055,_ ;.'2=1/2.,-- ...,-. 635 - •. -.-0.698 - -- - USTE 362 USTE 20 OW EQ 0.025 0.055 3 92.1 0.569 0.847 10 360 ,____.,..„..,.. 400 USTE. , 0025 - ': . . , 4- -., 101-.E )-- - - - .0.603:. • . ' f.360 ... ... _ ,._... 600 USTE 0.025 0.055 6 152.4 0.782 1.163 180 162 USTX 0.028 0.060 1-5/8 413 0.436 0.648 480 ,_....., _- 250 USTX " • 00213':-. - - :- acts() - - 2-1/2'; • . i 635,':- -," .:a524 -••• , •:a779 • 480 -. ,...._... USTX 362 USTX 20 STR EQ 0.028 0.060 3 92.1 0.637 0.947 10 360 74 00 'iJW .-:... 0.028 ;-.• '--.;'. A060 '7-;.• - •. .4 . --- - ' - 101.6 -...• ...- 0 674:;.: - ,.1.002 :„ - 360 600 USTX 0.028 0.060 6 152.4 0.875 1300 180 'The term "Effective Thickness" was created by Underwriters Laboratory (UL) to establish a minimum thickness measurement after the UltraSTHELF manufacturing process - has occurred. Effective thickness Is the measurement across the peeks of the dimples or the thickest part of the steel :The manufacturing, base steel and quality control process is verified by independent third party UL representatives, who make regular unannounced visits to Dlebich's manufacturing facilities to assure full compliance with UL established quality control standards. - request a quote online @ aieirich= a •com The pace lo srop...treforc the building starts!" 26 eui,4° • FI4D :TECNICAL IFVFORIV�ATION °,<<,;`i :t - Applicatlpn ,commendations for ,wori?.ai:t!,ie >wallorceiling • 401': Suspension Systems for OREGON 'REVISED 4/07 Acoustical Lay-in Ceilings This document has been reviewed by • the State of Oregon, Building Codes • Division. In all buildings, other than structures classified as occupancy category III and IV, suspended ceilings installed In accordance with the , / prescriptive provisions of the 401- OREGON document are deemed by.the State of Oregon, Building � Codes Division to comply with the �• statewide code Interpretation. This document provides the IBC - referenced standards for the instal- lation of suspension systems for General Recommendations acoustical lay in ceilings. Incorpora- • Referenced sources per hierarchy: 2006 IBC (International Building Code), American Society of Testng Materials (ASTM C 635, ASTM C 636), Ameri- tion of this document will provide a can Society of Civil Engineers (ASCE 7 -05) and Ceilings and Interior Systems Construction Association (CISCA). more uniform standard for installation • Partitions that are tied to the ceiling and all partitions greater than 6 feet in and inspection. This document is height shall be :atelally braced to the structure. Bracing shall be independent of the ceiling splay bracing system. Soul re ICBC: section 1621.1.2 designed to accomplish the.intent of • For further information on bracing of non bearing partitions refer to the International Building Code (IBC) . IWVCB technical document #201. with regard to the requirements for • All man beams are to be Heavy Duty (HD). Sou.ve ASCE 7-0526m 9.6.2.6.2.23 seismic design category D, E and F for • All cross tees shall be capable of carrying the design load without exceeding deflection equal to 1/360 01 its span. Scu, +:o •::s'Ca ?ones 3.4 'suspended ceilings and related items. • These recommendations are intended for Unless supported by engineering, the suspended ceilings including grid, panel or tile, light fixtures and air terminals weighing suspension system shall be installed ro more the 4 lbs. per square foot. Svu' e AScE ? -05 item 9.6.2.6.1 per the requirements for Seismic De - ' All wire ties are to be three tight firms • - maximum 3' it sign Category (SDC) D, E and F per t76mm> around itself within three inches. Twelve the IBC. Manufacturers' recommen t gage Hanger wire spaced 4 foot on center (figure 1). Sou, r.,r.,.) , ASrn•1 C 636 item 2.3.4 dations should be followed. f = • Changes in ceiling planes will require posi- _ tive bracing. • figure 1 SO Ve ASCE 7•05 Section 9.6 2.6 .2 ?. Item I 1 aL:4CT'MI ES! ∎YAL :. 3 :I: 3 :!gEALI SLISPfr. ,ON SYSTEMS FOR ACOUSTICAL LAY -IN CEILINGS • figure 2 • Lateral Force Bracing (figures 2 and 3) Lateral force Bracing .• Ceilings constructed of lath and plaster or gypsum board, screw or nail attached to suspended members that support a ceiling on one level extending from wall to wall shall be exempt from the lateral forte bracing requirements. source CISCA _ones s -4 45• or leas . -' •.. 45 of ton • Lateral force bracing is the use of vertical struts (compression posts) and splay wires (see figure 2). • Lateral force bracing is required for ceilings over 144 square feet and not \ .1 :;:I": -� ,� gage required for ceilings less than 144 square feet provided they are surrounded by a Y .5• «lean ` grace four walls and braced to structure. Suture: Stare or Deport, Botrialg Gales Dnvc•x' • .5•v Ian wires • Lateral Force Bracing shall be 12 feet on center (maximum) and begin no farther than 6 feet from alls. Source: circa Sorsrr t zo:rs ?- Cross tee Main beam -- • Seismic splay wires are to be four 12 gage wires attached to the man beam. Wires are arrayed 90° from each other and at an angle not exceeding 45° from the plane of the ceiling. Source: C/SCA Suvnc a,nes 3 - 4 . figure 3 • Seismic splay wires that be attached to the grid and to the structure in such •� Maximum Recommended Lengths for a manner that they can support a design load of not less than 200 pounds or Vertical Struts the actual design load, with a safety factor of 2. whichever is greater (figure 6b). source. :ASCaa °les -4 , EMT CONDUIT, . •P di shot -in- anchors° when used for seismic application as part of • %z' EMT conduit up to 510' the prescriptive path in Seismic Design Categories D, E and F shall have an • ICC -ES approval for seismic applications and shall require "special inspection° 4° EMT conduit up to 7' 8" irrespective of the type of occupancy category the structure is in. Anchors for 1" EMT conduit up to 9' 9" kicker wires (splayed wires installed for purposes other than seismic restraint) are exempt from this requirement. source: State or Oregon, Bulldog Cones Ov,;.1 METAL STU • Splay wires are to be within 2 inches of the connection of the vertical strut to suspended ceiling. ':%rurc e• COCA S issmrc zones 3 - Single 1 metal stud (20 gauge) up to 12'0' • Rigid bracing may be used in lieu of splay wires. Source ASCE section 9.6 2 s?..: Back -to -back 1%" metal stud up to 15'0" • Ceilings with plenums less than 12 inches to structure are not required to have (20 gauge) lateral force bracing. -Source: Nrr:iLrrrd Btd'dtr:g D.p inn wit Single 2/° metal stud (20 gauge) up to 13 6° • Vertical struts must be positively attached to the - suspension systems and the Structure above. Str:rce CISCA .., -4 Back -to -back 2 Y2 metal stud up to 150' • The vertical strut may be EMT conduit, metal studs or a proprietary compression (25 gauge) post (see figure 3) Source: Portland Boding Depc'rinient Wal Moldings (figures 4a and 4b) . . Afore: Ptarwn areas greeter then 15'0' w?t reguee argineerrly earcerk,uo:is - • Wall moldings (perimeter closure angles) are required to have a horizontal flange 2 inches wide. One end of the ceiling gnd shall be attached to the wall mold- . figure 4a ing, the other end shall have a 3 inch clearance from the wall and free to-slide Attached Wall Molding Requirements So,,,i . ASCE '-05 Sector 9.6.2 6.2.2 rte'' l b - , l .'', • Where substantiating documentation has been provided to the local jurisdiction, / , I • WALL � "" ° � , perimeter angle. Source: State a Oregon, Bu;ki�n meter clips may be used to satisfy the requirements for the 2 -inch closure °d•• w" j le. r - n. g Coda Division e / I • The grid shall be attached at two adjacent walls (pop rivets or approved method) 0 - 0 �` I Soffits extending to a point at least level with the bottom plane of the grid and i independently supported and laterally braced to the structure above are deemed / - J r to be equivalent to walls. sor,:l;el stare orarK,ori Bu:hhnc Codes Distan uo m ° ' w -' a j • There shall be a minimum 3 inch clearance from the end of the gnd system at .. un- attached walls Sauce .4SCE 7-05 seam'? 9.6.2.6.2.2 d ?n b figure Qb Spreader Bars (figure 4b) - Unattached Wall Molding Requirements • -Spreader (spacer) bars shell be used to prevent the ends of the main beams and cross tees at perimeter walls from spreading open dunng a seismic event • Perimeter wires shall not be in lieu of spreader bars. Source: CISCA Seisrnt ZOO PS -•t • W K, "' ° " "" °� / ' / - • Spreader bars are not required at perimeters' where runners are attached directly to closure angles. - 0 : o �; :pm;,.. °. a • Wire tying is an acceptable attemative to spreader bars. 0 7°. • �; M;;` • Spreader bars are not required if a 90 degree intersecting cross or main is within • /, „ ° ° . I ^ •;;;°d ° . J '°°'° °'°"' 8 inches of the perimeter wall. ■ a mma >,' Al mutl a ua wits . 4 0.e • Where substantiating documentation has been provided to the local lunsdiction, ••a , perimeter clips may be used to satisfy the requirements for spreader bars . Saliva State of Oregon 64 7'ng Codes CI.nsron • NORTHWEST WILL a CEILING BUREAU • SuSPENSi•Ou SYSTEMS FOR ACOUsTicAL LHr-ii.: c:E,LlI - S Hanger (Suspension) Wires (figures 5a and 5b) figure 5a 0.3 IM • • Hanger and perimeter wires must be plumb within 1 in 6 unless (figure 5a) counter . sloping wires are provided (figure 5b) Sot:rt:o• .asrm c oil secoon 21.4 • Hanger wires shall be 12 gage and spaced 4 feet on center or 10 gage spaced 5 feet on center: SaLAx3 451119 C 636 • Any connection device at the supporting construction shall be capable of carrying - not less than 100 pounds. soon . c(SCA zones 3 -4 ' ' — • Powder driven shot -in- anchors are an approved method of attachment for hanger wires. Soup: Store of aogon. 13otru xj Codas D t-e. t! _ _ • Terminal ands of each main beam and cross tee must be supported within 8 inches of each wall with a perimeter wire (see figure 4 & 5 b). S:>;.. cis a zones 3 -4 • Wires shall not attach to or bend around interfering material or equipment. A figure 5b • Counterstoping trapeze or equivalent device shall be used where obstructions preclude direct suspension. Trapeze suspensions shall be a minimum of back-to-back 114 inch / j\ • cold - rolled channels for spans exceeding 48 inches Sour e C SC4 zones 3-4 %•� V \ i r r r . `. rt • • Elec fixtures / w : I .rte ` ', ' • Light fixtures weighing less than 10 pounds shall have one 12 gage hanger wire I '�) { connected from the fixture to the structure above. This wire may be slack. Scarp • — ' — - - CISCA Seismic zones 3-4 • Light fixtures weighing more than 10 pounds and less than 56 lbs. shall have two 12 gage wires attached at opposing corners of the light fixture to the structure above. These wires may be slack. Su,m e: c:fsc:; Rennin-, ;^nos 3.4 Light Fixtures weighing more than 56 lbs. shall be supported by directly from the figure 6a • structure above. These wires must be taut. spume- CfsCA Sei m c notes 3 -4 • _ hanger wire attachment • Pendant mounted fixtures shall be directly supported from the structure above - Shot n anchor _ r, l �• using a 9 gage wire or an approved alternate support without using the ceiling - - suspension system for direct support. r� .ice. +s 4 ec; - iu: zrn S tructurei concrete les + -� - i �— — Ceiling OD -- — Sre • Tandem fixtures may utilize common wires. .. r'B Tai . (II • Mechanical Services - . 3 turns. _— _...__._ --_ • Terminals or services weighing 20 lbs but not more than 56 lbs. must have two • 12 gage wires connecting them to the ceiling system hangers or the structure Venice' hanger wire - - - -- - • -- ••• -•- above. These wires may be slack 5:,is. =• rises SNz int r...ws _ -u • • Terminals or services weighing more than 56 lbs. must be independenfi s fig 6b ported directly-from the structure above These wires must be taut. Sxurca.• ` CISCA Splayed seismic bracing wire attachment Sesric -1712F 3-4 doll -n e:mansion anchor -- --- --•- - -:rl Seismic Separation Joints (figure 7) i • For ceiling areas exceeding 2,500 square feet. a seismic separation joint•or full structural Concrete -J f • y height wall partition that breaks the ceiling shalt be provided unless analyses are " steel strap 1' wide x 2• long x 12 gage"mrnrmum - ----- __ ___— performed of the ceilings bracing system, closure angles and penetrations to 3 turns - .proVide sufficient clearance. sourro _7a„E 744 floto 9 0 a, ?.8.2? c1 SDiayee seismic bracing wire' —^- . • The layout and location of the seismic separation.joint shall be per the of record and noted on the plans. li a seismic separation joint is required by the • . designer, the designer may use the generic joint detailed in this document -or a " • . . propnetary joint. The amount of free movement (gap design),shall be a minimum figure 7. • : , ` of inch. yuuree State of (? raps,. Burld,;w• Codes (n :szr • • In lieu of seismic separation joints, the ceiling may be divided into areas less than. 2500 square feet by the use of partitions or soffits as follows; ' partjtions tiall't nd - a minimum of 6 inchescabove the level of the plane of the grid and shall be rode- ' ti pendently braced to the structure above: Soffits shall extendto a'point at least level 11 . with the bottom plane of the grid and shall be independently laterally -lateraly braced to the structure above. S ce: Seto of Gtirg7; p•$e dscg Codes Dimon - - . • C li ;�•, ou • �, - • Other than partitions and soffits, seismic joints may not be used as part of a fire • rated ceiling assembly unless substantiating documentation is provided. , source. • . Stara of C> argon 6u:+d:+s f Cocitis' O:vrsto I - . • �: t t . • • - j Flange �` PoD y J Rivet .. miplm !43FTu WEST WALL & ceiLu o ur:EAU . Susi'ei- . Qy O1rSTEMS_EOnACOUS1ICAL LAY -1,J CE'uI-i s • • Sprinklers For ceilings without rigid bracing, sprinker head penetrations shall have a 2 inch oversize ring, sleeve or adapter through the ceiling the to allow free movement of at least 1 inch in all horizontal directions. Flexible head design that can accommodate 1 inch free movement shall be permitted as an alternate. s re• A CE 7 -05 9 626.22 irsn e GLOSSARY FOR THIS. DOCUMENT (regi)nal term in ology may var':y) -; F • , CROSS TEES LATERAL FORCE BRACING PERIMETER WIRES The cross member that interlock with the The bracing method used to prevent veil- Hanger wires placed within eight inches of main beams, also known as cross runners ing uplift or restrict lateral movement during the surrounding walls. or cross T -bars. a seismic event. Lateral force bracing consists of vertical struts and splay wires. PLENUM DIFFUSER The space above a suspended ceiling. A crroularor rectangular metal grill used MAIN BEAM • for the passage of air from a ducted The primary suspension member sup- SLACK WIRE • system ported by hanger wires, also known as the A 12 gage wire that is not tight or taut, main runner, carrying tee. carrying runner SPREADER or SPACER BAR ESSENTIAL SERVICE BUILDINGS or mains. Any buildings designed to be used by A bar with notches to prevent the suspen- public agencies as a fire station, ' MOLDING /CLOSURE ANGLE sion system from separating, also called a police station, emergency operations A light gauge metal angle or channel fas- stabilizer bar. center, State Patrol office, sheriff's tened to the perimeter wall or partition to SPLAY WIRES office, or emergency communication support the perimeter ends of an ac - Wires installed at an angle rather than dispatch center, coustical ceiling grid. perpendicular to the grid. GRID PERIMETER CLIPS VERTICAL STRUTS The main beams and cross tees of the Proprietary angle bracket attached directly The rigid vertical member used in lateral suspension system. to the wall molding/closure angle which allows for Y° movement in the event of force bracing of the suspension sys HANGER WIRE seismic activity and interlocks property with tern. Also known as compression posts, 10 or 12 gage soft annealed wire used as ends of grid system. seismic pods, seismic struts. Common primary support for the grid system. Also materials are electrical conduit (EMT), called suspension wires. metal studs or proprietary products. • • • Tha NWQB kias•b seNing the con ction . • ; ; '.::-t industry. for over forty y ears.: It ferr�nlze -es :a ' technical authority educatiohal;#ody and $polies= Northwest per forlthe. wall-and ceiling iricdustiy it -provides • . Wall and .. servides to'architects and the constriction commu Ceiling ' nitj On all.ma relating to tile diversified wall and Bureau . NWCB - Oregon ' ceiingg industry. ' • 'As Phone: (503) 295 -0333 • ttle. irxiustry's develgpmeat and coordination Fax: -(503) 295-2733 . . , 'orgactl?ation, the' PIVNCO�aw;the nebd;to establish '' . • 1032 -A NE 65th St. a:dpoum it: to •p"ravkfepJarillcatiorand, tf he-intent • . ; . it an•eng s " ' ''' �ted . SeatU WA 98 • B,C dCiliAsociation ; © (f ati F2rtf14uai .l 441iis, u . Phone (206), 524 -424 Phone: ":(604J.597 :7 180 cwt)•, agenc f feller 7 rn 3 • , •, - , Fax:;(604) 72 08 f g ent fcy�i It Is me nt_to'set e,3s asset - • ' Fax (208) 524 -4436 > • : : :: , , . :. -7..:, o arltl i; r tirite n di3d; for . . - - Tali 800 524 = 42.15• .•Alberrta'Wall and-. ~ . , " or. ��. . ( ) _ Ceiling Association :5::. ' ccoristructi ect. :''' �;��' " • ` ' • �• . • • - info ®nwcb.org P h _ on e;- (40?)250 -7045 Ttie;N0V it7lakesixii9 or :imflied,warrarity • vwy • (403) 29:1 .. , ; 4 , , . . - .nwcb.or r - �FaX: -95 15 - �•�..":•. � : ,, - �- . . .i , , •.. • e J •: , `., L ,, - • A LASKA IDAHO • OREGON • WASHING.TON • : ALBERTA • • BRITISH • C.OLUMBIA SASKATCHEWAN Building Codes Division Statewide Code Interpretation Worlang with Oregonians ,,,.1-1 �.���,,,. to ensure safe building S ` % '' canstruct u. g a opositive rt while No 2004 OSSC Section 1621.1 and e support 1 c b usiness climate. 2007 OSSC (effective on April 1, 2007) Section 1613.1. 2004 OSSC Section 1621.1, • 1 2007 OSSC Section 1613.1, Code Section: . • ASCE 7 -02 Section 9.6.2.6 and ASCE 7 -05 Section 1 ' 2004 and 2007 for OSSC's and • Code Edition: 2002 and 2005 for ASCE Standard 7. Date: REVISED: April 20, 2007 Subject: Construction requirements for Suspended Ceiling Systems. Question: What are the minimum requirements of the Oregon Structural Specialty Code for the construction of suspended ceiling systems? Answer: I. The following options are available: a. An engineered ceiling system designed for appropriate forces, b. Prescriptive ceiling systems per CISCA standards as provided below, except for ceiling systems in structures classified as Occupancy category III or IV: , • i. in Seismic Design Category C, construction in accordance • with CISCA standards for seismic zones 0 -2. All of the notes in section IV of this interpretation shall be . _applicable in addition to the CISCA requirements ii. in Seismic Design Categories D through F,, construction - • , in accordance with CISCA standard for seismic zones 3 . _ and 4 with modifications as noted in ASCE 7- 02 or , • ASCE 7 -05 standard. - . - All of the notes in sections IV and V of this interpretation . • ` • - ' shall be applicable in addition to the requirements contained in ASCE 7- 02/05 o•ASCE 7- 05'and the CISCA standards for Building Codes Division • Department of Consumer and Business Seriices • State of Oregon . • • 1535 Edgewater NW - Salem Oregon ♦ PO Box 14470 Salem OR 97309 -0404 02 , ' 503 - 378 -4133 • TTY 503- 373 -1 • Fax 503- 378 -2322 • bcd:oregon -gov ,: • ., ,. .• - Gam' In accordance with OAR 918 - 008 -0110, the information contained in this statewide code interpretation is i legally binding on any party involved in activities regulated by applicable Oregon law, applicable.Oregon regulations or the state building code. If the information contained in this statewide code..interpretationis cited as q basis for a civil infraction; a representative•of the mist cite the - interpretation numberfoundin•this •' • • Seismic Design Categories D through F. c. Effective April 1, 2007, (with the adoption of the 2007 OSSC) the following two additional options will be available based upon ASCE 7 -05 Sections 13.2.5 and 13.2.6: i. Shake table testing of components and their supports, to determine their seismic capacities, in accordance with ICC Acceptance criteria 156. {Section 13.2.5 of the ASCE 7-05.), or • ii. Seismic qualification by experience data based on nationally recognized procedures. {Section 13.2.6 of • the ASCE 7-05.) II. Northwest Wall & Ceiling Bureau - Technical Bulletin 401 OREGON (NWCB TB 4010R): In structures other than those classified as occupancy category Ill or IV, suspended ceilings installed in accordance with the prescriptive provisions of NWCB TB 4010R are deemed to comply with this interpretation. NWCB TB 4010R contains information compiled from the different applicable documents such as ASCE Standard 7 -05, IBC 2006, ASTM Standard C635 and CISCA and is available at the following internet address: • http: / /www.nwcb.org/ images /resource_files /401_OREGON.pdf All of the notes in sections IV and V of this interpretation shall be applicable in addition to the requirements contained in NWCB TB • 401OR III. The Seismic. restraint for suspended ceiling systems in structures • • • classified as Occupancy Category III and IV, are required to be designed for the specific project and the anchorage of the ceiling system is required to be periodically special inspected in Seismic Design Categories D, E, and F in accordance with the provisions of the • current edition of the Oregon Structural Specialty Code. IV. GENERAL NOTES. The following notes are applicable to sections I and II: • a. SPECIALTY CEILINGS. Specialty ceilings, must be installed using an engineered design and may not use the provisions of 'this • interpretation. Specialty ceilings include but are not limited to those: • i. Incorporating arched ceilings, curved or curvilinear • ceilings or sloped ceilings; or ii. Having no direct connection to the surrounding walls or supports, such as "free floating" or "cloud" ceiling • elements. b. TILES. Suspended ceilings installed to this interpretation may . use either standard acoustical lay -in ceiling panels, tegular or kerfed ceiling panels. - 2,- c. SPREADER BARS. i. Wire ties are deemed equivalent to spreader bars ii. Spreader bars are not required if a 90 degree intersecting cross or main is within 8 inches of the perimeter wall. iii. Spreader bars are not required at perimeters where ceiling grid ends are attached to closure angles. d. WIRE GAUGE: The minimum wire size shall be US Steel Wire Gage #12 (0.1055 inch). V. Notes Specific to Design Categories D through F a. Lateral force bracing is required for ceilings over 144 square feet. b. Ceilings with interstitial spaces less than 12 inches to framing • are not required to have lateral force bracing. c. GRID ATTACHMENT: The suspended ceiling grid shall be attached to two adjacent walls. Soffits complying D(ii)(2) are deemed to be equivalent to walls. d. SEISMIC JOINTS i. For ceiling areas exceeding 2,500 square feet, a seismic separation joint shall be provided. The layout and location of seismic separation joints shall be per the designer of record and noted on the plans. ii. In lieu of seismic separation joints, the ceiling may be divided into areas less than 2,500 square feet by the use of partitions or soffits as described below. 1. Partitions. Where used, partitions shall extend a • • • - minimum of 6 inches above the level of the - plane of the grid and shall be independently braced to the structure above. 2. Soffits. Where used, soffits shall extend to a point at least level with the bottom plane of the • grid and shall be independently supported and laterally braced to the structure above. iii. Other than partitions and soffits, seismic joints may not be used as part of a fire rated ceiling assembly unless • substantiating documentation is provided. iv. The minimum movement that must be accommodated at seismic joints is 3/4 of an inch. e. PERIMETER CLIPS: Where substantiating documentation is ,provided, perimeter clips may be used to satisfy the following requirements: 2-inch closure angle • ii. Spreader bar requirements f. Sprinkler Heads: Flexible head design that can accommodate 1 inch free movement in any direction shall be permitted as an - 3 - • • • alternate to the requirement for 2 inch oversize rings, sleeves or adapters through the ceiling tile. g. "Powder driven shot -in- anchors" when used for seismic • application as part of the prescriptive path in Seismic Design Categories D, E, & F shall have an ICC -ES approval for seismic applications and shall require "special inspection" irrespective of the type of "occupancy category" the structure is in. Anchors for kicker wires (splayed wires installed for purposes other than seismic restraint) are exempt from this requirement. • As of the issuance of this interpretation, approved load testing values for the use of "powder driven shot -in- anchors" in '1 normal - weight concrete over a metal pan deck have not been established Until such time as approved load testing values are established, an on -site pull -test of such assemblies is required. • The test shall demonstrate that the anchor can support a minimum 250 lbs for not less than 10 seconds and be conducted by an approved testing agency. At a minimum, such testing shall be performed on 5% of the total number of wires but no less 5. Test samples shall be selected from dispersed locations. On Site Test Failures. In case of pull test failures, the testing agency shall notify the local jurisdiction. An increased level of testing, as described below, shall be conducted. All failed anchors shall be replaced. Increased testing requirements. 1. A minimum of 6 anchors in the immediate vicinity of the failed anchor shall be tested. 2. In the event of any additional failure, all anchors placed on the same day shall be tested. Load testing results are required to be submitted to the local jurisdiction for approval prior to the ceiling grid inspections. . h. Expansion, Screw In and Adhesive Anchors. The International Codes Counsel — Evaluation Services (ICC -ES) has recently • issued new acceptance criteria for the anchors noted above. In order to give manufacturers time to complete the approval process, the Building Codes Division is authorizing the following grace periods effective immediately: 1. Expansion anchors: Grace period expires November 30, 2007. In the interim, expansion anchors must comply with the previously issued acceptance criteria "ACO 1." After that date, expansion anchors must comply with the new ICC -ES acceptance criteria "AC 193." 2. Screw anchors: Grace period expires April 30, 2008. In the interim, screw anchors must comply with the previously issued acceptance criteria "AC106." After that date, screw -4- I ' anchors must comply with the new ICC -ES acceptance criteria "AC 193." - - — 3 -- Adhesive anchors: Grace period expires April30, - 200Mn the interim, adhesive anchors must comply with the previously issued acceptance criteria "AC58." After that date, adhesive anchors must comply with the new ICC -ES • acceptance criteria "AC308." Please note that the grace periods referenced above will not be extended VI. Upgrading of Existing Ceilings; a. Ceilings without Seismic Bracing. Where existing ceilings are without seismic bracing, the ceiling system shall be brought into substantial compliance with current code requirements when 50% or more of the ceiling tile is altered, repaired or replaced as part of a general space alteration, or if all of the ceiling system is removed. • Substantial Compliance means installation of the following items where required in new construction; i. lateral force bracing (splayed wires) ii. compression struts iii. slack wires on all light fixtures and air terminals. This requirement does not trigger the need for; i. 2 inch closure angle as specified in section II ii. Seismic separation joints iii. 1 inch movement in all directions around sprinkler pendants These upgrades are not required when: i. removing portions of tiles or panels and/or grid to alter ductwork, sprinkler pipe, etc. ii. portions of a ceiling are,removed only to facilitate the installation of sprinkler piping. • b. Ceilings without Compression Struts. Where existing ceilings have seismic bracing but do not have compression struts at the center of the splayed wires, the addition of compression struts will only be required when and where the grid is replaced, altered, raised or lowered. Analysis: Building Codes Division staff has obtained clarifications from both the ASCE and CISCA staff regarding the intent of provisions in their respective documents. Both documents intended to allow the prescriptive construction of suspended ceilings in accordance with the methodology provided in the appropriate CISCA standard along -with the modifications listed in the ASCE 7 document. Contact: Richard S. Rogers, Structural Program Chief • richard.rogers ®state.or.us (503) 378 -4472 -5-