A construction project involves installing new roofing on a commercial building. The work area is 25 feet above ground level on a flat roof. What is the minimum distance a warning line system must be placed from the roof edge under Cal/OSHA?
Correct Answer
C) 15 feet
Cal/OSHA requires warning line systems to be placed at least 15 feet from roof edges on flat roofs to provide adequate warning to workers.
Why This Is the Correct Answer
Cal/OSHA requires warning line systems on flat roofs to be placed at least 15 feet from the roof edge. This distance provides sufficient warning space so workers are alerted before approaching the unprotected edge.
Why the Other Options Are Wrong
Option A: 10 feet
10 feet is insufficient under Cal/OSHA for flat roof warning line placement. This distance does not provide adequate reaction distance for workers who may be moving backward or not watching the edge.
Option B: 6 feet
6 feet is the federal OSHA standard for personal fall arrest systems and guardrail requirements — not the Cal/OSHA warning line setback distance. California has stricter requirements than federal OSHA in this regard.
Option D: 20 feet
20 feet exceeds the requirement and while it would provide more safety margin, it is not the minimum distance specified by Cal/OSHA. Choosing 20 feet as a minimum would unnecessarily restrict the usable work area.
Memory Technique
Remember '15 feet for flat feet' — flat roofs need 15-foot warning line setback. Alternatively, think: 15 feet is roughly one story of height — the warning line is placed one story's worth of horizontal distance from the edge as a buffer zone.
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