Warning Line Systems on Low Slope Roofs

Why it matters

On a big flat roof, a warning line six feet from the edge marks where the safe zone ends. Inside the line you can work free; between the line and the edge, you need fall protection. The system only works if the line is rigged to spec and everyone respects it like a cliff edge, because that is what it stands for. Today we cover how to set a warning line right and the rules for crossing it.

Hazards

• ⚠ Warning line sagging, too low, or made of unflagged string nobody sees
• ⚠ Working between the line and the edge without fall protection
• ⚠ Stepping over the line to grab a tool or take a phone call
• ⚠ Mechanical equipment operating past the line
• ⚠ Line set closer than 6 feet to the edge
• ⚠ Corners and access points left open

Controls and safe practices

• ✓ Rig the line 34 to 39 inches high, flagged every 6 feet, on stanchions that resist tipping.
• ✓ Keep the line at least 6 feet from the edge, 10 feet where mechanical equipment crosses.
• ✓ The line must have at least 500 pounds of breaking strength: rope, wire, or chain, not caution tape.
• ✓ Between the line and the edge: personal fall arrest, safety monitor per the plan, or do not go.
• ✓ Close the loop: the line goes all the way around the work area including corners.
• ✓ One path in and out, marked, with the same protection rules at the access point.
• ✓ Foreman resets the line every time the work area moves.

Crew discussion questions

1. Is our warning line at spec height and distance right now?
2. Who is allowed between the line and the edge, and wearing what?
3. Where is our access path through the line?
4. If we use a safety monitor, who is it and what is their only job?

Applicable OSHA standards

29 CFR 1926.501, 29 CFR 1926.502

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