Scout's Toolbox Talks

Warning lines are your early alert system on a roof. They won’t physically stop you — but they give you a clear boundary before you reach a deadly edge.

Why It Matters

Not all roof jobs allow for guardrails or anchors — especially on low-slope roofs during installation.

That’s where warning line systems and controlled access zones (CAZs) come in.

They create a visual barrier and help workers maintain safe distance from the fall hazard — but they only work if they’re used correctly.

Key Points

• Warning lines must be set up at least 6 feet from the roof edge (minimum)
• Lines should be high-visibility (bright flags or rope), with markers spaced no more than 6 feet apart
• Only authorized and trained workers may enter the Controlled Access Zone (inside the warning line)
• A designated safety monitor may be required to ensure unauthorized workers stay out
• Never cross a warning line without a plan and fall protection, if required

✅ If you’re inside the warning line, treat it like a danger zone.

Know the Rules of the Zone

✅ Allowed Inside the CAZ:

• Workers assigned to perform tasks near the edge
• Individuals trained on the site-specific fall protection plan
• Teams working under the supervision of a designated monitor

🚫 Not Allowed Inside:

• Unauthorized personnel
• Workers carrying materials who aren’t tied off or trained
• Anyone not briefed on the hazards inside the CAZ

A warning line is not just a suggestion — it’s a controlled boundary that must be respected to keep everyone safe.

Ask the Crew

• Who is authorized to enter the controlled access zone today?
• Is our warning line system properly set up and clearly visible?
• Do we have someone monitoring the zone and enforcing access rules?

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