Criteria for Supported Scaffolds
Foundations
Supported scaffolds' poles, legs, posts, frames, and uprights must bear on base plates and mud sills, or other adequate firm foundation. 1926.451(c)(2)(i) and (ii)
Restraining
Supported scaffolds with a height to base width ratio of more than 4:1 must be restrained by guying, tying, bracing, or an equivalent means. 1926.451(c)(1)
Either the manufacturers' recommendation or the following placements must be used for guys, ties, and braces:
- Install guys, ties, or braces at the closest horizontal member to the 4:1 height and repeat vertically with the top restraint no further than the 4:1 height from the top.
Supported scaffolds' poles, legs, posts, frames, and uprights must bear on adequate firm foundation.
- Vertically -- every 20 feet (6.1 meters) or less for scaffolds less than three feet (0.91 meters) wide; every 26 feet (7.9 meters) or less for scaffolds more than three feet (0.91 meters) wide.
- Horizontally -- at each end; at intervals not to exceed 30 feet (9.1 meters) from one end. 1926.451(c)(1)
Knowledge Check Choose the best answer for the question.
2-5. Supported scaffolds must be restrained by guying, tying, bracing, or an equivalent means when _____.
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