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DSS Skills Development Center Smith Sinnett / 2020045 <br />Chapel Hill, North Carolina Orange County <br /> <br />ACOUSTICAL TILE CEILINGS 09 51 23 - 6 <br />3. Splay hangers only where required and, if permitted with fire-resistance-rated ceilings, to miss <br />obstructions; offset resulting horizontal forces by bracing, counters playing, or other equally <br />effective means. <br />4. Where width of ducts and other construction within ceiling plenum produces hanger spacings that <br />interfere with location of hangers at spacings required to support standard suspension system <br />members, install supplemental suspension members and hangers in form of trapezes or equivalent <br />devices. <br />5. Secure wire hangers to ceiling suspension members and to supports above with a minimum of <br />three tight turns. Connect hangers directly either to structures or to inserts, eye screws, or other <br />devices that are secure and appropriate for substrate and that will not deteriorate or otherwise fail <br />due to age, corrosion, or elevated temperatures. <br />6. Do not support ceilings directly from permanent metal forms or floor deck. Fasten hangers to <br />cast-in-place hanger inserts, post installed mechanical or adhesive anchors, or power-actuated <br />fasteners that extend through forms into concrete. <br />7. When steel framing does not permit installation of hanger wires at spacing required, install <br />carrying channels or other supplemental support for attachment of hanger wires. <br />8. Do not attach hangers to steel deck tabs. <br />9. Do not attach hangers to steel roof deck. Attach hangers to structural members. <br />10. Space hangers not more than 48 inches o.c. along each member supported directly from hangers, <br />unless otherwise indicated; provide hangers not more than 8 inches from ends of each member. <br />11. Size supplemental suspension members and hangers to support ceiling loads within performance <br />limits established by referenced standards and publications. <br />C. Secure bracing wires to ceiling suspension members and to supports with a minimum of four tight turns. <br />Suspend bracing from building's structural members as required for hangers, without attaching to <br />permanent metal forms, steel deck, or steel deck tabs. Fasten bracing wires into concrete with cast-in- <br />place or post installed anchors. <br />D. Install edge moldings and trim of type indicated at perimeter of acoustical tile ceiling area and where <br />necessary to conceal edges of acoustical tiles. <br />1. Apply acoustical sealant in a continuous ribbon concealed on back of vertical legs of moldings <br />before they are installed. <br />2. Screw attach moldings to substrate at intervals not more than 16 inches o.c. and not more than 3 <br />inches from ends, leveling with ceiling suspension system to a tolerance of 1/8 inch in 12 feet. <br />Miter corners accurately and connect securely. <br />3. Do not use exposed fasteners, including pop rivets, on moldings and trim. <br />E. Install suspension system runners so they are square and securely interlocked with one another. Remove <br />and replace dented, bent, or kinked members. <br />F. Arrange directionally patterned acoustical tiles as follows: <br />1. Install tiles with pattern running in one direction parallel to long axis of space. <br />3.4 CLEANING <br />A. Clean exposed surfaces of acoustical tile ceilings, including trim and edge moldings. Comply with <br />manufacturer's written instructions for cleaning and touchup of minor finish damage. Remove and <br />replace tiles and other ceiling components that cannot be successfully cleaned and repaired to <br />permanently eliminate evidence of damage. <br />END OF SECTION 09 51 23 <br /> <br /> <br />DocuSign Envelope ID: ECCAC5A0-6CC8-4B37-8AD3-89D69F0AE1AE