All utlity line bridges shall be submitted and approved prior to fabrication showing; full dimensions, wall and floor attachments, materials, construction and finish. All bridges must comply with all safety ordinances pertinent to installation. Materials shall be electrolysis and maintenance free aluminum or #302 stainless steel. Bridges shall be "SURE STEP" Model UB 60-75, Utility Line Bridge, 28.5" (723.9mm) wide for safe passage, as manufactured by Royalite Manufacturing Inc., 1055 Terminal Way, San Carlos, CA 94070-3226, (800) 875-9548.

Steps shall be 2" x 1" (50.8 x 25.4mm) in section by 24" (609.6mm) long, extruded from 6063-T5 aluminum, serrated on the top surface, smooth and rounded on the sides and bottom. Steps shall carry a 1200# (544.31 kg) load without failing.

Heavy-duty side rails shall be extruded from 6063-T5 aluminum, no less than .125" (3.175mm) wall thickness by 4" (101.6mm) wide x 2" (50.8mm) smooth and burr free Channels. Steps and handrails shall be fastened using 302 stainless steel self locking fasteners or full penetration inert gas heliarc welds.

Platform shall be 24" (609.8mm) wide, extruded 6063-T5 aluminum, serrated on the top surface. The platform shall be not less than 12" (304.8mm) or more than 36"(914.4mm) in length, and 14"(335.6) high.

Roof pads shall be 0.25" (6.35mm) aluminum checkerplate, 8" (302.2mm) x 18.25" (463.55mm) Finish shall be mill finish or UV protected polyurethane in manufacturers’ standard color or OSHA safety yellow color as specified by the architect. Finish to be applied over a chromatized surface pretreatment.

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