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
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- 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
- 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)]