24.A.09 Safe Roof Access.
Crawling Board (Chicken Ladder)
- Platforms, level and guarded must be provided at the landing area on the roof.
- Crawling boards.
- (1) Crawling boards must be not less than 10 in (25 cm) wide and 1 in (2.5 cm) thick, having cleats 1 in x 1.5 in (2.5 cm x 3.75 cm).
- (2) Cleats must be equal in length to the width of the board and spaced at equal intervals not to exceed 24 in (60 cm).
- (3) Nails must be driven through and clinched on the underside. Screws may be used in lieu of nails.
- (4) Crawling boards must be secured and extend from the ridge pole to the eaves when used with roof construction, repairs, or maintenance.
- (5) A firmly fastened lifeline of at least 3/4 in (2 cm) diameter rope, or equivalent, must be strung beside each crawling board for a handhold.
- Access paths must be erected as follows:
- (1) Points of access, material handling areas and storage areas must be connected to the work area by a clear access path formed by two warning lines.
- (2) When the path to a point of access is not being used, one of the following must be used:
- (a) A rope, wire, or chain, equal in strength and height to the warning line, must be placed across the path at the point where the path intersects the warning line erected around the work area, or
- (b) The path must be offset such that a person cannot walk directly into the work area.
Knowledge Check Choose the best answer for the question.
24-2. Which of the following is TRUE concerning crawling boards.
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