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DocuSign Envelope ID:D561B1AE-DF34-4907-AD06-AOEB37BBE427 <br /> CHAPEL HILL ORANGE COUNTY VISITORS BUREAU August 12,2020 <br /> 308 WEST FRANKLIN,CHAPEL HILL,NC <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 /> HOLLOW METAL DOORS AND FRAMES 081113 - 5 <br />