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198934 Roof Stairs INSTALLATION INSTRUCTIONS.pdf - Westeel

198934 Roof Stairs INSTALLATION INSTRUCTIONS.pdf - Westeel

2. On the side of the

2. On the side of the roof stair opposite to the inspection hatch location, the support arms (234504) are installed as per the instructions in the ladder manual, using the support arm clips (234517) and support arm brackets (234518), if the roof stair is properly centered to the external ladder. Alternatively one support arm can be attached to the stair stringer, (Figure 3). If there is interference of the support arm that extends inward, with the stair stringer, another means of properly supporting the pass through rail, inwards and outwards, will need to be developed. The method proposed in the next step would be adequate. LADDER SUPPORT ARMS (234504) PASS THROUGH RAILS (234505) SUPPORT ARM BRACKETS (234518) Figure 3 SUPPORT ARM CLIP (234517) 3. On the side of the roof stair adjacent to the inspection hatch, the support arms (234504) are used to form part of the protective cage around the inspection hatch (Figure 27). It is very important that the pass through rail is secured to the roof structure in an inwards and outwards direction. Pick the location where the pass through rail crosses the flange of the bottom stair tread. Drill a 3/8” hole completely through the pass rail tube, and through the flange of the stair tread. Secure using a 3/8” x 4 1/2” fully threaded bolt (150475) that is triple nutted as shown (Figure 4). Secure the bolt to the pass through rail with one nut, and sandwich the flange on the stair tread with the remaining 2 nuts. Adjust the relative position of the nuts and tighten to lock into position. If possible, also secure the second pass through in the manner as well. PASS THROUGH RAILS (234505) STAIR TREAD Figure 4 Page 14

TYPICAL ROOF STAIR INSTALLATION (BOTTOM STAIR MODULE SHOWN AS IF INSPECTION HATCH ON RIGHT SIDE OF STAIRS) HAND RAIL STAIR TREAD SHORT HANDRAIL LEFT STRINGER (BOTTOM FLANGE POINTS OUTWARD) HANDRAIL POST MIDDLE RAIL (BOTTOM FLANGES POINT OUTWARDS) STRINGER RIGHT (BOTTOM FLANGES POINTS OUTWARD) 3/8” x 1” BOLT AND NUTS (TYPICAL) 3/8” x 1” BOLTS AND NUTS (TYPICAL) SHORT MIDDLE RAIL Z-SHAPE SUPPORTS Figure 5 *SHORT HANDRAIL AND MID-RAIL ARE PROVIDED FOR THE BOTTOM STAIR MODULE (THIS MODULE IS AT THE LOWERSM POSITION ON THE ROOF). THE OTHER MODULES CONTAIN THE REGULAR LENGTH HANDRAILS AND MID- RAILS (SEE LAYOUT SECTION). • For larger bin diameters, additional roof stair modules bolt together as shown in the layout drawings. • The bottom end of the stair, the short rail and short midrail bolt on the side of the stair adjacent to the inspection hatch. The mating handrail post is moved forward to accommodate. Page 15

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