Footings
Supported scaffold poles, legs, posts, frames, and uprights shall bear on base plates and mud sills or other adequate foundation capable of supporting a loaded scaffold.
Scaffold baseplates and mudsills increase the area where the downward forces of the scaffold are transmitted. The scaffold load is transferred from the uprights to the base plates and then to the mud sills or other adequate foundation from the scaffold legs, which must show minimal or negligible settlement under a full scaffold loading to be adequate.
The purpose of the mud sill under the scaffold base plate is to uniformly distribute the scaffold load over a larger area than that distributed by the base plate alone, thereby reducing the loading on the ground beneath the base plates. Don’t use bricks, blocks, barrels, or other unstable objects to level a scaffold.
Foundations
An adequate foundation is one that, like base plates on mud sills, will prevent the scaffold from settling into the ground. In all cases a competent person must inspect and approve the foundation daily.
Knowledge Check Choose the best answer for the question.
1-3. Support scaffold footings must _____.
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