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 HL, Hatch Ladder, with "Lift-up rail extensions". Side rails shall lift up and lock 42" (1066.8mm) above the top step of the ladder for safe roof egress and ingress and retract into the ladder frame with roof hatch closed. "Lift-up side rails" are an exclusive integral component of the ladder, 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. Rails shall be rounded on the corners and protected on the exterior to prevent tampering or vandalism of the step fasteners. Slide rails shall be constructed using 302 stainless steel self locking fasteners, full penetration inert gas heliarc welds, ground smooth and burr free.

Lift-up side rails shall be made of 6063-T5 extruded aluminum, extend and lock 42" (1066.8mm) above the top step, then retract into the heavy duty side rails by releasing the latch mechanism located near the top of the side rails.

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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