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<br /> <br />THE CITY OF SUNNY ISLES BEACH <br />PROJECT NO. 21-1011 <br />BUILDING DEPARTMENT RELOCATION TO ANNEX <br /> <br />Project No. 21-1011 November 2024 095100-5 <br />2. Suspension System: DONN Centricities’ (DXT) as manufactured by USG Building <br />Systems. T- Bar, intermediate duty suspension systems complying with ASTM C <br />635, 9/16” flange width. <br /> <br />a. Color: Flat White (050). <br /> <br />C. Accepted equivalent single manufacturer able to provide all specified items. <br />D. Accessory Materials: <br /> <br />a. Wall Moldings: to match gird. <br />b. Hangers: 12 ga. Galvanized wire. <br /> <br /> <br />PART 3 - EXECUTION <br /> <br />3.1 PREPARATION <br /> <br />A. Coordination: Furnish layouts for inserts, clips, or other supports required to be installed <br />by other trades for support of acoustical ceilings. <br /> <br />B. Measure each ceiling area and establish layout of acoustical units to balance border widths <br />at opposite edges of each ceiling. Avoid use of less-than-half width units at borders. <br /> <br /> <br />3.2 INSTALLATION <br /> <br />A. General <br /> <br />1. Install ceilings in accordance with the manufacturer's written instructions, <br />provisions of ASTM C636, and CISCA publication Acoustical Ceilings - Use and <br />Practice, and a maximum deflection of 1/360th of the span between hangers. <br /> <br />2. Provide wall moldings at all places where tile abuts a vertical surface. <br /> <br />3. Install hangers, frames, rings and boxes furnished by other trades, as required. <br /> <br />4. Arrange acoustical units and orient directionally-patterned units with <br />pattern running in one direction. <br /> <br />5. Install lay-in acoustical panels in coordination with suspension system, with <br />edges concealed by support of suspension members. Scribe and cut panels to fit <br />accurately at borders and at penetrations. <br /> <br />6. Install hold-down clips in all panels located within 20 feet of exterior doors or <br />openings, or spaced as recommended by panel manufacturer, unless otherwise <br />indicated or required. <br /> <br />B. Suspension System: <br /> <br />1. Install suspension systems to comply with ASTM C 636, with hangers <br />supported only from building structural members. Locate hangers not less than 6 <br />in. from each end and spaced 4 ft. along each carrying channel or direct-hung <br />runner, unless otherwise indicated, leveling to tolerance of 1/8 in. in 12 ft.