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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br />GYPSUM BOARD 092900 - 6 <br />E. Form control and expansion joints with space between edges of adjoining gypsum panels. <br />F. Cover both faces of support framing with gypsum panels in concealed spaces (above ceilings, <br />etc.), except in chases braced internally. <br />1. Unless concealed application is indicated or required for sound, fire, air, or smoke <br />ratings, coverage may be accomplished with scraps of not less than 8 sq. ft. (0.7 sq. m) in <br />area. <br />2. Fit gypsum panels around ducts, pipes, and conduits. <br />3. Where partitions intersect structural members projecting below underside of floor/roof <br />slabs and decks, cut gypsum panels to fit profile formed by structural members; allow <br />1/4- to 3/8-inch- (6.4- to 9.5-mm-) wide joints to install sealant. <br />G. Isolate perimeter of gypsum board applied to non-load-bearing partitions at structural <br />abutments, except floors. Provide 1/4- to 1/2-inch- (6.4- to 12.7-mm-) wide spaces at these <br />locations, and trim edges with edge trim where edges of panels are exposed. Seal joints <br />between edges and abutting structural surfaces with acoustical sealant. <br />H. Attachment to Steel Framing: Attach panels so leading edge or end of each panel is attached to <br />open (unsupported) edges of stud flanges first. <br />I. Wood Framing: Install gypsum panels over wood framing, with floating internal corner <br />construction. Do not attach gypsum panels across the flat grain of wide-dimension lumber, <br />including floor joists and headers. Float gypsum panels over these members, or provide control <br />joints to counteract wood shrinkage. <br />J. STC-Rated Assemblies: Seal construction at perimeters, behind control joints, and at openings <br />and penetrations with a continuous bead of acoustical sealant. Install acoustical sealant at both <br />faces of partitions at perimeters and through penetrations. Comply with ASTM C 919 and with <br />manufacturer's written recommendations for locating edge trim and closing off sound-flanking <br />paths around or through assemblies, including sealing partitions above acoustical ceilings. <br />3.3 APPLYING INTERIOR GYPSUM BOARD <br />A. Install interior gypsum board in the following locations: <br />1. Regular Type: As indicated on Drawings. <br />2. Type X: Where required for fire-resistance-rated assembly. <br />3. Ceiling Type: Ceiling surfaces. <br />4. High-Impact Type: As indicated in these specifications above.. <br />5. Moisture- and Mold-Resistant Type: [As indicated on Drawings] <Insert requirements>. <br />B. Single-Layer Application: <br />1. On ceilings, apply gypsum panels before wall/partition board application to greatest <br />extent possible and at right angles to framing, unless otherwise indicated. <br />2. On partitions/walls, apply gypsum panels [vertically (parallel to framing)] [horizontally <br />(perpendicular to framing)], unless otherwise indicated or required by fire-resistance- <br />rated assembly, and minimize end joints. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2