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' L es -o n ,m o � e � , 6 _ � less ig�,,�� , Building Codes Division Statewide Code Interpretation Working with Oregonians ' to ensure safe building construction while No 2004 OSSC Section 1621.1 and supporting a positive business climate. 2007 OSSC (effective on April 1, 2007) Section 1613.1. 2004 OSSC Section 1621.1, 2007 OSSC Section 1613.1, Code Section: ASCE 7 -02 Section 9.6.2.6 and ASCE 7 -05 Section 13.5.6.2.2 2004 and 2007 for OSSC's and Code Edition: 2002 and 2005 for ASCE Standard 7. Date: November 6, 2006 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. Ceiling systems designed for appropriate forces, or b. Prescriptive construction for suspended ceiling systems is allowed 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 standard for seismic zones 0 -2. All of the notes in section IV of this interpretation shall be applicable in addition to the requirements contained in the CISCA standards for Seismic Design Category C. 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 Building Codes Division ♦ Department of Consumer and Business Services ♦ State of Oregon 1535 Edgewater NW Salem, Oregon ♦ PO Box 14470 Salem, OR 97309 -0404 503- 378 -4133 ♦ TTY 503- 373 -1358 *Fax 503- 378 -2322 ♦ bcd.oregon.gov * In accordance with OAR 918- 008 -0110, the information contained in this statewide code interpretation is 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 interpretation is cited as a basis for a civil infraction, a representative of the jurisdiction must cite the interpretation number found in this document. Il in ASCE 7- 02 or ASCE 7 -05 and the CISCA standards for 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 (NWCB TB 401): In other than structures classified as occupancy category III or IV, suspended ceilings installed in accordance with the prescriptive provisions of NWCB TB 401 are deemed to comply with this interpretation. NWCB TB 401 contains information compiled from the different applicable documents such as ASCE Standard 7 -02, IBC 2003, ASTM Standard C635 and CISCA and is available at the following interne address: www.nwcb.org /files /401.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 401. Additionally, spreader bars are required at the ends . of both main beams and cross tees (currently, NWCB TB 401only references main beams). III. The Seismic restraint for suspended ceiling systems in structures classified as Occupancy Category III and IV, are required to be both designed and to have periodic special inspection of the anchorage to the structure 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 3 ceilings or sloped ceilings; or ii. Having no direct connection to the surrounding walls, 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. 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. 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. SEISMIC JOINTS i. The minimum movement that must be accommodated at seismic joints is 3 /4 of an inch. 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 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. d. PERIMETER CLIPS: Where substantiating documentation is provided, perimeter clips may be used to satisfy the following requirements: i. 2 inch closure angle ii. Spreader bar requirements iii. Perimeter wires e. Sprinkler Heads: Flexible head design that can accommodate 1 inch free movement in any direction shall be permitted as an alternate to the requirement for 2 inch oversize rings, sleeves or adapters through the ceiling tile. f. "Powder driven shot -in- anchors" when used 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. 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 a substantial amount (50% or more) of the ceiling tile is removed, altered or repaired as part of a general space alteration, or if all the ceiling is removed for washing, painting or replacement. 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@a,state.or.us (503) 378 -4472 or Ravindra K. Mahajan, P.E., Code Facilities Engineer ravindra.k.mahajan @state.or.us (503) 373 -1354