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604 Scaffold Safety
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Types of Supported Scaffolds

Pole or Wood 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.

Multi-Level Scaffold
Multi-level scaffold on the side of a building.

Pole scaffolds are old-fashioned and are rarely used today because they have to be built from scratch and cannot be reused. More information on this scaffold.

Mast Climbers

Mast climbing supported scaffolds (mast climbers) carry much heavier loads than traditional scaffolding and are used to position personnel and the necessary tools, equipment, and materials needed to perform work at great heights.

Mast climbers can be free-standing or tied to a structure at intervals for stability at increased heights. The mast may be supported on a stationary base, or for some projects that are lower, on a mobile base. Mast climbers can reduce the potential for shoulder and lower back injuries because they can be adjusted to optimized working heights. Proper platform positioning reduces material handling hazards and fatigue and improves productivity. More information on this scaffold.

This mast climber scaffold was involved in a multiple-fatality accident.

Knowledge Check Choose the best answer for the question.

2-2. Which type of supported scaffold can carry much heavier loads than traditional scaffolding?