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Indian River County Courthouse Renovations <br />100% CD Submittal PGAL Project No. R1002627.00 <br />3.2 PREPARATION <br />A. Measure each ceiling area and establish layout of acoustical panels to balance border <br />widths at opposite edges of each ceiling. Avoid using less -than -half -width panels at <br />borders, and comply with layout shown on reflected ceiling plans. <br />3.3 INSTALLATION <br />A. General: Install acoustical panel ceilings to comply with ASTM C 636/C 636M and <br />seismic design requirements indicated, according to manufacturer's written instructions <br />and CISCA's "Ceiling Systems Handbook." <br />B. Suspend ceiling hangers from building's structural members and as follows: <br />1. Install hangers plumb and free from contact with insulation or other objects within <br />ceiling plenum that are not part of supporting structure or of ceiling suspension <br />system. <br />2. Splay hangers only where required to miss obstructions; offset resulting <br />horizontal forces by bracing, countersplaying, or other equally effective means. <br />3. Where width of ducts and other construction within ceiling plenum produces <br />hanger spacings that interfere with location of hangers at spacings required to <br />support standard suspension -system members, install supplemental suspension' <br />members and hangers in form of trapezes or equivalent devices. <br />4. Secure wire hangers to ceiling -suspension members and to supports above with <br />a minimum of three tight turns. Connect hangers directly either to structures or to <br />inserts, eye screws, or other devices that are secure and appropriate for <br />substrate and that will not deteriorate or otherwise fail due to age, corrosion, or <br />elevated temperatures. <br />5. Secure flat, angle, channel, and rod hangers to structure, including intermediate <br />framing members, by attaching to inserts, eye screws, or other devices that are <br />secure and appropriate for both the structure to which hangers are attached and <br />the type of hanger involved. Install hangers in a manner that will not cause them <br />to deteriorate or fail due to age, corrosion, or elevated temperatures. <br />6. Do not support ceilings directly from permanent metal forms or floor deck. <br />Fasten hangers to cast -in-place hanger inserts, postinstalled mechanical or <br />adhesive anchors, or power -actuated fasteners that extend through forms into <br />concrete. <br />7. When steel framing does not permit installation of hanger wires at spacing <br />required, install carrying channels or other supplemental support for attachment <br />of hanger wires. <br />8. Space hangers not more than 48 inches o.c. along each member supported <br />directly from hangers unless otherwise indicated; provide hangers not more than <br />8 inches from ends of each member. <br />9. Size supplemental suspension members and hangers to support ceiling loads <br />within performance limits established by referenced standards and publications. <br />C. Secure bracing wires to ceiling suspension members and to supports with a minimum <br />of four tight turns. Suspend bracing. from building's structural members as required for <br />hangers, without attaching to permanent metal forms, steel deck, or steel deck tabs. <br />Fasten bracing wires into concrete with cast -in-place or postinstalled anchors. <br />May 1, 2018 <br />095113 Acoustical Panel Ceilings 100% Construction Documents <br />Page 7 of 10 <br />