A roofer is applying a single-unit covering on a low-slope (2:12) commercial roof 28 feet above the ground, with no parapets or railings at the edge. To comply with Cal/OSHA, the employer must ensure the worker:

Explanation

Roofing is not governed by §1670. That section covers personal fall arrest, restraint and positioning systems in general construction, and it routes roofing operations to §1730 instead (with §1731 taking over for new production-type residential roofs of 3:12 or steeper). Under §1730(b), on a slope of 0:12 to 4:12 with a single-unit covering, employees must be protected from falls from roofs more than 20 feet high, and the accepted methods include warning lines set back at least 5 feet from the edge with headers, personal fall protection, catch or scaffold platforms, eave barriers, railings, or parapets at least 24 inches high (a). At 28 feet the trigger is met. (b) is wrong because guardrails are one option among several, not the only one, and warning lines with headers are the standard low-slope method. (c) fails §1670(b) and §1730's own equipment rules: body belts are prohibited in a fall ARREST system because of the injuries they cause during arrest, and an anchorage must be rated, not improvised. (d) misstates the trigger — the figure in §1730 is more than 20 feet, not thirty, and certain equipment work requires protection regardless of height.