(a) Pole

Pole scaffolds are a type of supported scaffold in which every structural component, from uprights to braces to platforms, is made of wood. OSHA has standards for two kinds: single-pole, which are supported on their interior side by a structure or wall, and double-pole, which are supported by double uprights independent of any structure. Because they must be built from scratch and cannot easily be reused, pole scaffolds are considered old-fashioned and are rarely used today. When platforms are moved to the next level, the existing platform must be left undisturbed until the new bearers have been set in place and braced.

Where wooden poles are spliced, the following regulations apply:

• The ends must be squared.
• The upper section must rest squarely on the lower section.

Wood splice plates or scab plates must be provided on at least two adjacent sides, and must:

• Extend at least 2 feet on either side of the splice.
• Overlap the abutted ends equally.
• Have at least the same cross-sectional areas as the pole.
• Splice plates made of materials other than wood may be used if they are of equivalent strength.

Pole scaffolds over 60 feet in height must:

• Be designed by a registered professional engineer.
• Be constructed and loaded in accordance with that design.

Braces, Bearers and Runners

Cross bracing must be installed between the inner and outer sets of poles on double pole scaffolds.

Diagonal bracing must be installed in both directions across:

• The entire outside face of double- and single-pole scaffolds.
• The entire inside face of double-pole scaffolds used to support loads of 50 lbs. or more per square foot.
• Runners and bearers must be installed on edge.
• Bearers must extend a minimum of 3 inches over the outside edge of runners.
• Runners must extend over two poles at minimum.
• Be supported by bearing blocks securely attached to the poles.
• Braces, bearers, and runners must not be spliced between poles.