Section 6.18. Outriggers’ scaffolds

(a) Platforms. The platform of outriggers’ scaffolds shall consist of planks at least ten inches in width and two inches in thickness. They shall be laid tightly together and shall overlap their supports by at least 4 inches, but not more than 6 inches. In building the platform, provision shall be made for the erection of guardrails and toeboards.

(b) Thrustouts. Thrustouts shall not be built into a wall and left with no other support but shall project entirely through the wall or through windows and be solidly supported, braced, anchored, and fastened inside of the building. They shall be no less than 3 inches by 10 inches, set on edge, spaced no greater than 6 feet on centers and shall be rigidly held against turning or buckling. External supports shall be provided but shall not be depended upon as the main support.

(c) Suspended platforms below thrustouts. Where the platform is suspended below the thrustouts, it should be supported by vertical hangers of not less than 2 by 6 inch lumber and not more than 10 feet in length. The platform should be supported by 2 by 6 inch bearers, nailed to the vertical hangers and reinforced by cleats beneath the bearers. The suspended platform should be braced to prevent swaying.

(d) Horse scaffolds. Horse scaffolds shall not be erected upon the platform of an outrigger scaffold to gain additional height.

(e) Protection. Protection shall be afforded as set forth in § 6.32 (relating to protection).