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<br />Copyright 2002 AlA <br /> <br />MASTERSPEC Short Form <br /> <br />02/02 (R 05/06) <br /> <br />fusion without undercut or overlap. Remove welding flux immediately. At exposed <br />connections, fInish exposed welds smooth and blended. <br />2. Use connections that maintain structural value of joined pieces. <br />3. Cut, drill, and punch metals cleanly and accurately. Remove burrs and ease edges, unless <br />otherwise indicated. Remove sharp or rough areas on exposed surfaces. <br />4. Form bent-metal comers to smallest radius possible without impairing work. <br />5. Form exposed connections with hairline joints, flush and smooth, using concealed <br />fasteners where possible. Locate joints where least conspicuous. <br /> <br />C. Stair Framing: Fabricate stringers of steel [plates] [channels] [plates or channels]. Construct <br />platforms of steel [plate] [channel] [plate or channel] headers and miscellaneous framing <br />members. <br /> <br />1. If using bolts, fabricate and join so bolts are not exposed on fInished surfaces. <br />2. Where stairs are enclosed by gypsum-board[ shaft-wall] assemblies, provide hanger rods <br />or struts to support landings from floor construction above or below. <br />3. Where masonry walls support metal stairs, provide temporary supporting struts designed <br />for erecting steel stair components before installing masonry. <br /> <br />D. Metal-Pan Stairs: Form risers, subtread pans, and subplatforms to configurations shown from <br />steel sheet of thickness needed to comply with performance requirements but not less than <br />0.0677 inch (1.7 mm). <br /> <br />1. At Contractor's option, provide stair assemblies with metal-pan subtreads filled with <br />reinforced concrete during fabrication. <br />2. Provide epoxy-resin-filled treads, reinforced with glass fibers, with slip-resistant, <br />abrasive surface. <br /> <br />E. Abrasive-Coating-Finished, Formed-Metal Stairs: Form risers, treads, and platforms from steel <br />sheet of thickness needed to comply with performance requirements but not less than 0.0966 <br />inch (2.5 mm). Finish tread and platform surfaces with manufacturer's standard epoxy-bonded <br />abrasive finish. <br /> <br />F. Metal Floor Plate Stairs: Form treads and platforms from rolled-steel floor plate of thickness <br />needed to comply with performance requirements but not less than [1/4 inch (6.4 mm)] [3/16 <br />inch (4.8 mm)] [1/8 inch (3.2 mm)]. Form treads with integral nosing and back edge stiffener. <br />Weld steel supporting brackets to stringers and weld treads to brackets. <br /> <br />G. Metal Bar-Grating Stairs: Comply with NAAMM MBG 531, "Metal Bar Grating Manual." <br /> <br />1. Fabricate treads and platforms from steel grating with 1-1!4-by-3/16-inch (32-by-5-mm) <br />bearing bars at l5/16 inch (24 mm) o.c. and crossbars at 4 inches (100 mm) o.c. <br />2. Fabricate treads and platforms from steel grating with l-by-3!16-inch (25-by-5-mm) <br />bearing bars at 11/16 inch (17 mm) o.c. and crossbars at 4 inches (100 mm) o.c. <br />3. Fabricate grating treads with rolled-steel floor plate nosing and with steel angle or steel <br />plate carrier at each end for stringer connections. Secure treads to stringers with bolts. <br /> <br />H. Steel Tube Railings: Fabricate railings to comply with requirements indicated for design, <br />dimensions, details, fInish, and member sizes, including wall thickness of tube, post spacings, <br />and anchorage, but not less than that needed to withstand indicated loads. <br /> <br />METAL STAIRS <br /> <br />05511-5 <br />