What are the OSHA regulations for scaffold planking, specifically regarding overlap, placement, coatings, and mixing components?

Here are the answers to your questions:

11. Unless planks are nailed or otherwise restrained from movement the overlap must be at least: [1926.451 (b) (7)]

    • OSHA 1926.451(b)(7) specifies that when planks are overlapped, the overlap shall not be less than 12 inches (30 cm) unless they are nailed or otherwise restrained.
    • The correct option is c).
    • c. 12 inches (30.48cm)

12. Any platform that rests on a bearer at other than a right angle (such as at corners) shall be laid: [1926.451 (b) (8)]

    • OSHA 1926.451(b)(8) states that such platforms shall be laid first.
    • The correct option is a).
    • a. first

13. Scaffold planks may be coated periodically with wood preservatives, fire-retardant finishes, and slip-resistant finishes as long as the coatings: [1926.451 (b) (9)]

    • OSHA 1926.451(b)(9) requires that these coatings do not obscure the top or bottom surfaces of the plank.
    • The correct option is d).
    • d. do not obscure the top or bottom surfaces

14. Scaffold components of different manufactures shall not be intermixed unless: [1926.451 (b) (10)]

    • OSHA 1926.451(b)(10) allows intermixing only if the components fit together without force and the structural integrity is maintained.
    • The correct option is c).
    • c. the components fit together without force

15. Guys, ties, and braces shall be installed according to the scaffold manufacturer's recommendations or at the closest horizontal member to the: [1926.451 (c) (1)(ii)]

    • OSHA 1926.451(c)(1)(ii) specifies that guys, ties, and braces shall be installed above the 4:1 height to base ratio.
    • The correct option is b).
    • b. 4 to 1 height to base ratio