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Fall Protection Warning Line Systems

Warning line systems are barriers erected on a roof to warn workers that they are approaching an unprotected side or edge. These warning line systems also designate an area where roofing workers may work without fall protection. Warning line systems are made up of ropes, wires, or chains, as well as supporting stanchions. When employers use this method of fall protection, they must adhere to the following standards:

  • The warning line must be constructed around all sides of the roof work area.
  • The warning line must be erected at least 6 feet from the roof edge when mechanical equipment is not in use.
  • When mechanical equipment is in use, the warning line must be at least 6 feet from the roof edge running parallel to the direction of the mechanical equipment in use and 10 feet perpendicular to the roof edge.
  • The rope, wire, or chain must be flagged with high-visibility material at intervals of not more than 6 feet apart.
  • The rope, wire, or chain must be rigged so that it is no less than 34 inches and no more than 39 inches from the walkway.
  • The rope, wire, or chain must have a minimum tensile strength of no less than 500 pounds.
  • The stanchions used must be capable of resisting a force of 16 pounds. When a section of rope, wire, or chain is pulled on, the slack cannot move into another section.

To learn more about Fall Protection visit our OSHA Construction Fall Protection Online Training & Certification Course web page.

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