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40-27 BUILDING METAL STAIRS ' <br />BRPH ARCHITECTS -ENGINEERS, INC. <br />1. Material for Interior Locations: Carbon -steel components zinc plated to comply <br />with ASTM B 633 or ASTM F 1941, Class Fe/Zn 5, unless otherwise indicated. <br />2.4 MISCELLANEOUS MATERIALS <br />A. Welding Rods and Bare Electrodes: Select according to AWS specifications for metal , <br />alloy welded. <br />B. Universal Shop Primer: Fast -curing, lead- and chromate -free, universal modified -alkyd ' <br />primer complying with MPI#79 and compatible with topcoat. <br />1. Use primer containing pigments that make it easily distinguishable from zinc -rich I <br />primer. <br />C. Nonshrink, Nonmetallic Grout: Factory -packaged, nonstaining, noncorrosive, <br />nongaseous grout complying with ASTM C 1107. Provide grout specifically <br />recommended by manufacturer for interior and exterior applications. <br />D. Concrete Materials and Properties: Comply with requirements in Division 03 Section <br />"Cast -in -Place Concrete" for normal -weight, air -entrained, ready -mix concrete with a <br />minimum 28-day compressive strength of 4000 psi unless otherwise indicated. <br />E. Welded Wire Fabric: ASTM A 185/A 185M, 6 by 6 inches, W1.4 by W1.4, unless <br />otherwise indicated. <br />2.5 FABRICATION, GENERAL <br />A. Provide complete stair assemblies, including metal framing, hangers, struts, railings, <br />clips, brackets, bearing plates, and other components necessary to support and anchor <br />stairs and platforms on supporting structure. <br />1. Join components by welding unless otherwise indicated. <br />2. Use connections that maintain structural value of joined pieces. <br />B. Preassembled Stairs: Assemble stairs in shop to greatest extent possible. <br />Disassemble units only as necessary for shipping and handling limitations. Clearly <br />mark units for reassembly and coordinated installation. <br />C. Cut, drill, and punch metals cleanly and accurately. Remove burrs and ease edges to <br />a radius of approximately 1/32 inch unless otherwise indicated. Remove sharp or <br />rough areas on exposed surfaces. <br />D. Form bent -metal corners to smallest radius possible without causing grain separation <br />or otherwise impairing work. <br />E. Form exposed work with accurate angles and surfaces and straight edges. <br />C06922.001.00 0551 00 - 4 <br />05-22-14 ' <br />