Outrigger Scaffolds

An outrigger scaffold is a supported scaffold consisting of a platform resting on outrigger beams (thrustouts) projecting beyond the wall or face of the building or structure, the inboard ends of which are secured inside the building or structure.

Outrigger scaffolds must adhere to the following criteria:

• The inboard end of outrigger beams, measured from the fulcrum point to the extreme point of anchorage, must be not less than one and one-half times the outboard end in length.
• Outrigger beams fabricated in the shape of an I-beam or channel must be placed so the web section is vertical.
• The fulcrum point of outrigger beams must rest on secure bearings at least 6 inches in each horizontal dimension.
• Outrigger beams must be secured in place against movement, and must be securely braced at the fulcrum point against tipping.
• The inboard ends of outrigger beams must be securely anchored either by means of braced 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.
• The entire supporting structure must be securely braced to prevent any horizontal movement.
• To prevent their displacement, platform units must be nailed, bolted, or otherwise secured to outriggers.
• Scaffolds and scaffold components must be designed by a registered professional engineer and must be constructed and loaded in accordance with such design.

To learn more about Scaffolding Safety visit our Construction Scaffolding Safety Online Training web page.