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DocuSign Envelope ID: B94F2D40-3B3C-47A7-86C2-6F1 B4F92C62C <br /> SECTION 09 21 16-GYPSUM BOARD ASSEMBLIES <br /> E. Attach gypsum panels to steel studs so leading edge or end of each panel is attached to open (unsupported)edges <br /> of stud flanges first. <br /> F. Attach gypsum panels to framing provided at openings and cutouts. <br /> G. Form control and expansion joints with space between edges of adjoining gypsum panels from edge with control <br /> joint zip strip, caulk zip strip gap. Provide control joints as recommended by the manufacturer for regular gypsum <br /> wall board. Provide control joints at 20' o.c. and at edges of door and window openings for abuse resistant gypsum <br /> board. <br /> H. Isolate perimeter of non-load-bearing gypsum board partitions at structural abutments, except floors. Provide 1/4-to <br /> 1/2-inch-wide spaces at these locations, and trim edges with U-bead edge trim where edges of gypsum panels are <br /> exposed. Seal joints between edges and abutting structural surfaces with acoustical sealant. <br /> I. Space fasteners in gypsum panels according to referenced gypsum board application and finishing standard and <br /> manufacturer's written recommendations. <br /> 1. Space screws a maximum of 12 inches o.c.for vertical applications. <br /> 3.6 PANEL APPLICATION METHODS <br /> A. Single-Layer Application: <br /> 1. On partitions/walls, apply gypsum panels vertically(parallel to framing), unless otherwise indicated or required <br /> by fire-resistance-rated assembly, and minimize end joints. <br /> a. Stagger abutting end joints not less than one framing member in alternate courses of board. <br /> b. At stairwells and other high walls, install panels horizontally, unless otherwise indicated or required by <br /> fire-resistance-rated assembly. <br /> B. Single-Layer Fastening Methods:Apply gypsum panels to supports with steel drill screws. <br /> C. Multilayer Fastening Methods: Fasten base layers with screws; fasten face layers with adhesive and supplementary <br /> fasteners. <br /> D. Laminating to Substrate: Where gypsum panels are indicated as directly adhered to a substrate (other than studs, <br /> joists, furring members, or base layer of gypsum board), comply with gypsum board manufacturer's written <br /> recommendations and temporarily brace or fasten gypsum panels until fastening adhesive has set. <br /> 3.7 INSTALLING TRIM ACCESSORIES <br /> A. General: For trim with back flanges intended for fasteners, attach to framing with same fasteners used for panels. <br /> Otherwise, attach trim according to manufacturer's written instructions. <br /> B. Control Joints: Install control joints at locations indicated on Drawings. Install control joints additionally according to <br /> ASTM C 840 and in specific locations approved by Architect for visual effect. <br /> 3.8 FINISHING GYPSUM BOARD ASSEMBLIES <br /> A. General: Treat gypsum board joints, interior angles, edge trim, control joints, penetrations, fastener heads, surface <br /> defects, and elsewhere as required to prepare gypsum board surfaces for decoration. Promptly remove residual <br /> joint compound from adjacent surfaces. <br /> B. Prefill open joints, rounded or beveled edges, and damaged surface areas. <br /> C. Apply joint tape over gypsum board joints, except those with trim having flanges not intended for tape. <br /> D. Gypsum Board Finish Levels: Finish panels to levels indicated below, according to ASTM C 840, for locations <br /> indicated: <br /> 1. Level 1: Embed tape at joints in ceiling plenum areas, concealed areas, and where indicated, unless a higher <br /> level of finish is required for fire-resistance-rated assemblies and sound-rated assemblies. <br /> 2. Level 4: Embed tape and apply separate first, fill, and finish coats of joint compound to tape, fasteners, and <br /> trim flanges at panel surfaces that will be exposed to view, unless otherwise indicated. <br /> END OF SECTION 09260 <br /> ©BOOMERANG DESIGN#1835 0921 16-4 510 Meadowlands Drive,Hillsborough, NC <br /> ORANGE COUNTY,NC 11/15/18 <br />