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Scaffolds (Staging) Wood Trestle and Extension Trestle Ladders


Wood trestle ladders are self-supporting portable ladders consisting of two sections hinged to a frame. The size is designated by the length of the side rails measured along the front edge.

An extension trestle ladder is a wood trestle ladder with a straight ladder that extends from the top.

Note: Newer methods of ship construction have greatly reduced the use of these scaffolds. However, these scaffolds are primarily used during the construction and repair of boats.

Before reviewing this section, refer to the General Scaffolding Requirements.


Requirements and Example Solutions
  • Trestle ladders extensions must not exceed 20 feet. [29 CFR 1915.71(e)(1)]
  • Side rails and extension sections have minimal lumber dimensions and the extension sections must be parallel. [29 CFR 1915.71(e)(2) and (e)(3)]
  • Spread of the trestle ladders have minimal dimensions. [29 CFR 1915.71(e)(4)]
  • Side rails of the trestle ladder and the base section of the extension ladder have minimal dimensions in accordance with the length of the ladder. [29 CFR 1915.71(e)(5)]
  • Side rails must be beveled and provided with a metal hinge to prevent spreading. [29 CFR 1915.71(e)(6)]
  • Metal spreader or locking device must be components of each trestle ladder or extension ladder. [29 CFR 1915.71(e)(7)]
  • Rungs must be parallel, level, and spaced in accordance with ladder section. [29 CFR 1915.71(e)(8)]
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