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 scaffold baseplates and mudsills increase the area where the downward forces of the scaffold are transmitted. 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. Question 1: Section 1926.451(c)(2) states: "supported scaffold poles, legs, posts, frames, and uprights shall bear on base plates and mud sills or other adequate foundation." OSHA's Directive Number CPL 2-1.23 states: "A concrete slab would be considered a firm foundation, and therefore mud sills would not be necessary." What is the definition of "other adequate foundation?" What are some of the other options for providing an adequate firm foundation?Īnswer: An adequate foundation is one that, like base plates on mud sills, will prevent the scaffold from settling into the ground. Specifically, your questions deal with the following issues: what is considered a "firm foundation" for a scaffold, and who is responsible for determining the adequacy of the foundation? This is in response to your letter dated January 28, 2000, addressed to the Occupational Safety and Health Administration requesting an interpretation of the scaffold standard, Subpart L.
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