All ladders shall be submitted and approved prior to fabrication showing; full dimensions, wall and floor attachments, materials, construction and finish. All ladders must comply with all safety ordinances pertinent to installation. Materials shall be electrolysis and maintenance free aluminum or #302 stainless steel. Ladders shall be "SURE STEP" Model SLBR 75, Ships Ladder 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 4" x 1" (101.6 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 6" (152.4mm) wide x 2.25" (57.15mm) 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 24" (609.6mm) in length.

Hand rails shall be made of 6063-T5 extruded aluminum, 1.5" (38.1mm) x .125" (3.175mm) schedule 40 pipe, rounded at all corners, smooth and burr free, welded to aluminum mounting plates. Floor brackets shall be 6063-T5 extruded aluminum angles, 2"x2"x2"x1/8" (50.8 x 50.8 x 50.8 x 3.175mm), fastened to the heavy-duty side rails with 2 (two) _"(6.35mm) 20 x _"(19.06mm) stainless steel hex head bolt, self locking nut, & lock washer.

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.

Click here to download Microsoft Word DOC version of this specification.