R 408.41251 Outrigger scaffolds.

Rule 1251. (1) The inboard end of an outrigger beam measured from the fulcrum point to anchorage point shall be not less than 1 1/2 times the outboard end in length. The beams shall rest on edge, the sides shall be plumb, and the edges shall be horizontal. The fulcrum point of the beam shall rest on a secure bearing not less than 6 inches in each horizontal dimension. The beam shall be secured in place against movement and shall be securely braced at the fulcrum point against tipping. (2) The inboard end of an outrigger beam shall be securely anchored either by means of struts bearing against sills in contact with the overhead beams or ceiling or by means of tension members secured to the floor joists underfoot, or by both if necessary. The inboard end of an outrigger beam shall be secured against tipping, and the entire supporting structure shall be securely braced in both directions to prevent any horizontal movement. (3) An outrigger scaffold shall be constructed as prescribed in table 4. (4) Planking shall be laid tight and shall extend to within 3 inches of the building wall. Planking shall be secured to the outriggers. (5) A scaffold and scaffold components shall be designed by a qualified person who is knowledgeable in scaffolding and shall be constructed and loaded pursuant to the design. (6) Table 4 reads as follows: TABLE 4 SPACING AND LENGTH OF OUTRIGGER SCAFFOLDS Maximum Scaffold Load Light Duty 25 p.s.f. Medium Duty 50 p.s.f. Outrigger size 2 inches by 10 inches 3 inches by 10 inches Maximum outrigger spacing 8 feet 6 feet Maximum outrigger length 6 feet 6 feet