Walking/Working Surfaces
Coated Surfaces
Workers are not be permitted to walk on the top surface of any structural steel member installed after July 18, 2006 that has been coated with paint or similar material, unless all of the following are met:
- The coating has achieved a minimum average slip resistance of .50 in laboratory tests.
- The tests were based on the appropriate ASTM standard test method and conducted by a qualified laboratory.
- Documentation of the test results is available at the site and to the steel erector.
Plumbing-Up
It's important to make sure the structure being erected is "plumb" or exactly vertical. The process of lining up the building elements in a precise vertical direction is called "plumbing up."
It's important to make sure the structure being erected is vertical.
- When a competent person deems it necessary, plumbing-up equipment must be installed during the steel erection process to ensure the stability of the structure.
- When plumbing-up equipment is used, it must be in place and properly installed before the structure is loaded with construction material such as loads of joists, bundles of decking, or bundles of bridging.
- Plumbing-up equipment may be removed only with the approval of a competent person.
Knowledge Check Choose the best answer for the question.
3-5. The process of lining up the building elements in a precise vertical direction is called _____.
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