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CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12, 2020 <br />308 WEST FRANKLIN, CHAPEL HILL, NC <br /> <br />HOLLOW METAL DOORS AND FRAMES 081113 - 5 <br />7. Frames for Borrowed Lights: [0.042-inch- (1.0-mm-) thick steel sheet] [0.053-inch- (1.3- <br />mm-) thick steel sheet] [0.067-inch- (1.7-mm-) thick steel sheet] [Same as adjacent door <br />frame]. <br />D. Hardware Reinforcement: Fabricate according to ANSI/SDI A250.6 with reinforcement plates <br />from same material as frames. <br />2.4 FRAME ANCHORS <br />A. Jamb Anchors: <br />1. Masonry Type: Adjustable strap-and-stirrup or T-shaped anchors to suit frame size, not <br />less than 0.042 inch (1.0 mm) thick, with corrugated or perforated straps not less than 2 <br />inches (50 mm) wide by 10 inches (250 mm) long; or wire anchors not less than 0.177 <br />inch (4.5 mm) thick. <br />2. Stud-Wall Type: Designed to engage stud, welded to back of frames; not less than 0.042 <br />inch (1.0 mm) thick. <br />3. Compression Type for Drywall Slip-on Frames: Adjustable compression anchors. <br />4. Postinstalled Expansion Type for In-Place Concrete or Masonry: Minimum 3/8-inch- <br />(9.5-mm-) diameter bolts with expansion shields or inserts. Provide pipe spacer from <br />frame to wall, with throat reinforcement plate, welded to frame at each anchor location. <br />B. Floor Anchors: Formed from same material as frames, not less than 0.042 inch (1.0 mm) thick, <br />and as follows: <br />1. Monolithic Concrete Slabs: Clip-type anchors, with two holes to receive fasteners. <br />2. Separate Topping Concrete Slabs: Adjustable-type anchors with extension clips, <br />allowing not less than 2-inch (50-mm) height adjustment. Terminate bottom of frames at <br />finish floor surface. <br />2.5 FABRICATION <br />A. Fabricate hollow metal work to be rigid and free of defects, warp, or buckle. Accurately form <br />metal to required sizes and profiles, with minimum radius for thickness of metal. Where <br />practical, fit and assemble units in manufacturer's plant. To ensure proper assembly at Project <br />site, clearly identify work that cannot be permanently factory assembled before shipment. <br />B. Tolerances: Fabricate hollow metal work to tolerances indicated in ANSI/NAAMM- <br />HMMA 861. <br />C. Hollow Metal Frames: Where frames are fabricated in sections due to shipping or handling <br />limitations, provide alignment plates or angles at each joint, fabricated of same thickness metal <br />as frames. <br />1. Welded Frames: Weld flush face joints continuously; grind, fill, dress, and make smooth, <br />flush, and invisible. <br />2. Frames: Provide closed tubular members with no visible face seams or joints, fabricated <br />from same material as door frame. Fasten members at crossings and to jambs by butt <br />welding. <br />DocuSign Envelope ID: 775B89AF-3514-4D9E-B148-2FDE4EFF16C2