Structural Performance: Railings, including attachment to building construction, shall withstand the effects of gravity loads and the following loads and stresses within limits and under conditions indicated: 1. Handrails and Top Rails of Guards: a. Uniform load of 50 lbf/ ft. applied in any direction. b. Concentrated load of 200 lbf applied in any direction. c. Uniform and concentrated loads need not be assumed to act concurrently. 2. Infill of Guards: a. Concentrated load of 50 lbf applied horizontally on an area of 1 sq. ft.. b. Infill load and other loads need not be assumed to act concurrently. B. Thermal Movements: Allow for thermal movements from ambient and surface temperature changes. 1. Temperature Change: 120 deg F, ambient; 180 deg F,material surfaces. 2.2 METALS, GENERAL A. Metal Surfaces, General: Provide materials with smooth surfaces, without seam marks, roller marks, rolled trade names, stains, discolorations, or blemishes. 2.3 STAINLESS STEEL A. Tubing: ASTM A554, Grade MT 304. B. Pipe: ASTM A312/A312M, Grade TP 304. C. Plate and Sheet: ASTM A240/A240M or ASTM A666, Type 304. 2.4 FASTENERS A. General: Provide the following: 1. Stainless-Steel Railings: Type 304 stainless-steel fasteners. 2. Provide exposed fasteners with finish matching appearance, including color and texture, of railings. B. Post-Installed Anchors: Torque-controlled expansion anchors capable of sustaining, without failure, a load equal to 6 times the load imposed when installed in unit masonry and 4 times the load imposed when installed in concrete, as determined by testing according to ASTM E488/E488M, conducted by a qualified independent testing agency. 1. Material for Exterior Locations and Where Stainless Steel Is Indicated: Alloy Group 2 stainless-steel bolts, ASTM F593, and nuts, ASTM F594 5 MISCELLANEOUS MATERIALS A. Welding Rods and Bare Electrodes: Select according to AWS specifications for metal alloy welded. 1. For stainless-steel railings, provide type and alloy as recommended by producer of metal to be welded and as required for color match, strength, and compatibility in fabricated items. B. Bituminous Paint: Cold-applied asphalt emulsion complying with ASTM D1187/D1187M. C. Anchoring Cement: Factory-packaged, nonshrink, nonstaining, hydraulic-controlled expansion cement formulation for mixing with water at Project site to create pourable anchoring, patching, and grouting compound. 1. Water-Resistant Product: At exterior locations provide formulation that is resistant to erosion from water exposure without needing protection by a sealer or waterproof coating and that is recommended by manufacturer for exterior use. 2.6 FABRICATION A. General: Fabricate railings to comply with requirements indicated for design, dimensions, member sizes and spacing, details, finish, and anchorage, but not less than that required to support structural loads. B. Shop assemble railings to greatest extent possible to minimize field splicing and assembly. Disassemble units only as necessary for shipping and handling limitations. Clearly mark units for reassembly and coordinated installation. Use connections that maintain structural value of joined pieces. C. Cut, drill, and punch metals cleanly and accurately. Remove burrs and ease edges to a radius of approximately 1/32 inch unless otherwise indicated. Remove sharp or rough areas on exposed surfaces. D. Form work true to line and level with accurate angles and surfaces. E. Connections: Fabricate railings with welded connections unless otherwise indicated.
