The Definition of Safety Monitoring System

Definition of Safety Monitoring System

A safety monitoring system is a fall protection method in which a competent person is assigned to watch workers near an unprotected edge and warn them when they are in danger of falling or acting unsafely. OSHA defines it in 29 CFR 1926.500(b) as a system in which a competent person monitors the safety of all employees in a roofing crew and warns them when it appears they are unaware of a fall hazard.

A safety monitor does not physically stop a fall. The system depends entirely on the monitor's attention and on workers responding to warnings immediately. For that reason, OSHA permits safety monitoring systems only in limited situations, and many contractors avoid relying on them alone. They are considered one of the weakest forms of fall protection.

When a Safety Monitoring System Can Be Used

• Low-slope roofing: Under 29 CFR 1926.501(b)(10), a safety monitoring system may be used alone during roofing work on low-slope roofs 50 feet or less in width. On wider low-slope roofs, it may be used together with a warning line system.
• Fall protection plans: Under 1926.502(k), when an employer shows that conventional fall protection is infeasible or creates a greater hazard for leading edge work, precast concrete erection or residential construction, a safety monitoring system may be used as part of the written fall protection plan, usually with a controlled access zone.

Safety monitoring systems are not permitted for steep roofs, and they are not a substitute for guardrails or personal fall arrest in general construction work.

OSHA Requirements for Safety Monitors

Under 29 CFR 1926.502(h), when a safety monitoring system is used:

• Competent monitor: The employer must designate a competent person to monitor the safety of other employees.
• Hazard recognition: The monitor must be competent to recognize fall hazards.
• Warnings: The monitor must warn employees when it appears they are unaware of a fall hazard or are acting unsafely.
• Same surface: The monitor must be on the same walking-working surface as the employees and within visual sighting distance.
• Voice range: The monitor must be close enough to communicate orally with the employees.
• No other duties: The monitor may not have other responsibilities that could take their attention away from monitoring.
• No mechanical equipment: Mechanical equipment may not be used or stored in areas where safety monitoring systems are used on low-slope roofs.
• Restricted access: Only employees engaged in roofing work, or covered by a fall protection plan, may be in an area where workers are protected by a safety monitoring system.
• Prompt compliance: Each employee working in a controlled access zone must comply promptly with fall hazard warnings from the monitor.

Good Practices for Safety Monitoring

• Use it as a last option: Consider guardrails, travel restraint or personal fall arrest first, and use a monitor only where allowed and justified.
• Limit the crew size: One monitor can only effectively watch a small number of workers in a compact area.
• Rotate monitors: Monitoring is mentally tiring. Schedule breaks and swap monitors so attention stays sharp.
• Agree on warnings: Use clear, consistent verbal warnings, and make sure everyone understands them, including in the crew's working languages.
• Check noise and sightlines: Equipment noise, wind and roof features can block the monitor's view or voice. Reposition or stop work if communication breaks down.
• Train everyone: Monitors need training on fall hazards and their duties, and crew members need to know they must respond to warnings immediately.

Example of Safety Monitoring System

A roofing contractor is replacing the membrane on a 40-foot-wide low-slope roof over a retail store. Because the roof is less than 50 feet wide, the contractor's plan uses a safety monitoring system for the crew of four. The foreman designates an experienced roofer as the monitor, who stays on the roof with no tools or tasks of her own and positions herself where she can see every worker and the roof edge.

Late in the morning, a worker backing up while unrolling membrane comes within a few feet of the edge. The monitor calls a warning, and he stops and steps away. After a delivery truck starts a noisy generator next to the building, the monitor finds the crew cannot hear her at the far end of the roof, so the foreman pauses work there until the generator is moved.

Frequently Asked Questions: Safety Monitoring System

Can a safety monitor also do roofing work?

No. OSHA requires the monitor to have no other responsibilities that could take their attention away from monitoring.

Can a safety monitoring system be used on any roof?

No. It may be used alone only on low-slope roofs 50 feet or less in width during roofing work. Wider low-slope roofs need it combined with a warning line system, and steep roofs need guardrails, nets or personal fall arrest.

How close does the monitor need to be?

The monitor must be on the same walking-working surface, within visual sighting distance and close enough to communicate orally with the workers.

Is a safety monitoring system allowed in general industry?

The safety monitoring system rules are in OSHA's construction standards. General industry low-slope roof work uses different options, such as designated areas and work rules under 29 CFR 1910.28.