![]() Supported scaffold poles, legs, posts, frames, and uprights shall be plumb (i.e. (For mobile scaffolds, the maximum height of the screw jack is 12 inches.) Plumb/Level/Square Most screw jacks will have a built-in stop so that the maximum height cannot be exceeded. The maximum extension for a screw jack is 18 inches high. Screw jacks must be used to level scaffolding on uneven surfaces. Unstable objects, such as bricks, cinder blocks, buckets, scrap lumber, etc., shall not be used to support or level scaffolds. ![]() The base and mud sill must provide a solid surface for the feet to sit upon so that the scaffold doesn't sink, move, settle, or shift. ![]() The size of the mud sill shall be based on the type of soil the scaffold will be erected upon. Supported scaffold poles, legs, posts, frames, and uprights shall bear on base plates and mud sills (or other adequate firm foundation). Scaffold components of dissimilar metals should not be used together, unless the competent person has determined that galvanic action will not reduce the strength of any component. Scaffold components cannot be mixed if they are from different manufacturers unless they fit together without force. Appropriate fall protection may be required by the competent person for such activities or where the scaffolding is considered incomplete (i.e. Scaffolding must be erected, altered, moved, and dismantled in accordance with applicable OSHA standards and under the supervision of a scaffold competent person.
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