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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br />GYPSUM BOARD 092900 - 5 <br />2. For fastening cementitious backer units, use screws of type and size recommended by <br />panel manufacturer. <br />D. Sound Attenuation Blankets: ASTM C 665, Type I (blankets without membrane facing) <br />produced by combining thermosetting resins with mineral fibers manufactured from glass, slag <br />wool, or rock wool. <br />1. Fire-Resistance-Rated Assemblies: Comply with mineral-fiber requirements of <br />assembly. <br />2. Recycled Content: Provide blankets with recycled content such that postconsumer <br />recycled content plus one-half of preconsumer recycled content constitutes a minimum <br />percent by weight for MR 4.1 and MR 4.2 compliance.. <br />E. Acoustical Sealant: As specified in Division 07 Section "Joint Sealants." <br />1. Provide sealants that have a VOC content of 250 g/L or less when calculated according to <br />40 CFR 59, Subpart D (EPA Method 24). <br />F. Thermal Insulation: As specified in Division 07 Section "Thermal Insulation." <br />G. Vapor Retarder: As specified in Division 07 Section "Thermal Insulation." <br />PART 3 - EXECUTION <br />3.1 EXAMINATION <br />A. Examine areas and substrates, with Installer present, and including welded hollow-metal frames <br />and framing, for compliance with requirements and other conditions affecting performance. <br />B. Examine panels before installation. Reject panels that are wet, moisture damaged, and mold <br />damaged. <br />C. Proceed with installation only after unsatisfactory conditions have been corrected. <br />3.2 APPLYING AND FINISHING PANELS, GENERAL <br />A. Comply with ASTM C 840. <br />B. Install ceiling panels across framing to minimize the number of abutting end joints and to avoid <br />abutting end joints in central area of each ceiling. Stagger abutting end joints of adjacent panels <br />not less than one framing member. <br />C. Install panels with face side out. Butt panels together for a light contact at edges and ends with <br />not more than 1/16 inch (1.5 mm) of open space between panels. Do not force into place. <br />D. Locate edge and end joints over supports, except in ceiling applications where intermediate <br />supports or gypsum board back-blocking is provided behind end joints. Do not place tapered <br />edges against cut edges or ends. Stagger vertical joints on opposite sides of partitions. Do not <br />make joints other than control joints at corners of framed openings. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2