OSHA regulations provide detailed systems and practices for different types of craftsmen. Which is an example of a practice for roofers?

Warning line systems are specifically designed for roofers as a means of fall protection when working on low-slope roofs. These systems involve the use of ropes, flags, or other barriers to alert workers to the edge of the roof and to prevent accidental falls. By establishing a visual boundary, warning line systems serve as an important safety measure, guiding workers as they perform tasks near the roof's edge. This practice is essential in maintaining safety on rooftops where workers are at a high risk of falling due to a lack of guardrails or other fall protection measures.

The other options, while related to general safety practices, are not specific to roofing operations. Guard rails are more commonly associated with edge protection on various types of elevated work, scaffolding safety pertains to the safe use and assembly of scaffolding, and site assessment is a broader scope of evaluating site conditions for safety but does not directly address practices that are unique to roofers.