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Orange County Health Department Improvements Smith Sinnett / 2024008 Hillsborough, NC Orange County Asset Management Services ACOUSTICAL TILE CEILINGS 09 51 23 - 6 B. Suspend ceiling hangers from building’s structural members and as follows: 1. Install hangers plumb and free from contact with insulation or other objects within ceiling plenum that are not part of supporting structure or of ceiling suspension system. 2. Splay hangers only where required to miss obstructions; offset resulting horizontal forces by bracing, countersplaying, or other equally effective means. 3. Splay hangers only where required and, if permitted with fire-resistance-rated ceilings, to miss obstructions; offset resulting horizontal forces by bracing, countersplaying, or other equally effective means. 4. Where width of ducts and other construction within ceiling plenum produces hanger spacings that interfere with location of hangers at spacings required to support standard suspension system members, install supplemental suspension members and hangers in form of trapezes or equivalent devices. 5. Secure wire hangers to ceiling suspension members and to supports above with a minimum of three tight turns. Connect hangers directly either to structures or to inserts, eye screws, or other devices that are secure and appropriate for substrate and that will not deteriorate or otherwise fail due to age, corrosion, or elevated temperatures. 6. Do not support ceilings directly from permanent metal forms or floor deck. Fasten hangers to cast-in-place hanger inserts, postinstalled mechanical or adhesive anchors, or power-actuated fasteners that extend through forms into concrete. 7. When steel framing does not permit installation of hanger wires at spacing required, install carrying channels or other supplemental support for attachment of hanger wires. 8. Do not attach hangers to steel deck tabs. 9. Do not attach hangers to steel roof deck. Attach hangers to structural members. 10. Space hangers not more than 48 inches o.c. along each member supported directly from hangers, unless otherwise indicated; provide hangers not more than 8 inches from ends of each member. 11. Size supplemental suspension members and hangers to support ceiling loads within performance limits established by referenced standards and publications. C. Secure bracing wires to ceiling suspension members and to supports with a minimum of four tight turns. Suspend bracing from building’s structural members as required for hangers, without attaching to permanent metal forms, steel deck, or steel deck tabs. Fasten bracing wires into concrete with cast-in-place or postinstalled anchors. D. Install edge moldings and trim of type indicated at perimeter of acoustical tile ceiling area and where necessary to conceal edges of acoustical tiles. 1. Apply acoustical sealant in a continuous ribbon concealed on back of vertical legs of moldings before they are installed. 2. Screw attach moldings to substrate at intervals not more than 16 inches o.c. and not more than 3 inches from ends, leveling with ceiling suspension system to a tolerance of 1/8 inch in 12 feet. Miter corners accurately and connect securely. 3. Do not use exposed fasteners, including pop rivets, on moldings and trim. E. Install suspension system runners so they are square and securely interlocked with one another. Remove and replace dented, bent, or kinked members. F. Arrange directionally patterned acoustical tiles as follows: 1. Install tiles with pattern running in one direction parallel to long axis of space. 3.4 CLEANING A. Clean exposed surfaces of acoustical tile ceilings, including trim and edge moldings. Comply with manufacturer’s written instructions for cleaning and touchup of minor finish damage. Remove and replace tiles and other ceiling components that cannot be successfully cleaned and repaired to permanently eliminate evidence of damage. END OF SECTION 09 51 23 Docusign Envelope ID: 2D852F9B-A7CF-462A-9536-444A53AA848A