CSLB C-39 Roofing ContractorSafety and RepairMedium
A roofing crew is performing hot mop roofing on a commercial building. Which of the following is an essential fire prevention measure specifically required by Cal/OSHA for hot-applied roofing operations?
- AMaintaining a minimum of 20 feet clearance between kettles and combustible materials.
- BEnsuring all workers wear fire-retardant clothing and gloves.
- CHaving a designated fire watch present for at least 30 minutes after operations cease.
- DUsing only propane-fired kettles with automatic shut-off valves.
Show answer & explanationAnswer & explanation
Correct answer: C. Having a designated fire watch present for at least 30 minutes after operations cease.
Cal/OSHA regulations for hot-applied roofing require a fire watch to remain on duty for a specified period after hot work has concluded, typically 30 minutes, to monitor for smoldering or delayed ignition.
Why the other options are wrong
- A. While clearance is important, the specific Cal/OSHA requirement for fire watch duration is more directly applicable here than a general clearance distance.
- B. While personal protective equipment (PPE) is crucial, fire-retardant clothing for all hot-mop workers is not a universal Cal/OSHA mandate as a primary fire prevention measure; the fire watch is specifically for preventing fires after the work.
- D. Cal/OSHA specifies requirements for kettles, but does not mandate only propane or automatic shut-off as the sole method; other types are permitted with safety measures.
Cal/OSHA Hot Work Fire Watch
For hot-applied roofing, a fire watch must be maintained for at least 30 minutes after operations cease to prevent delayed ignition.
- Required for hot-applied roofing and other hot work.
- Monitors for smoldering materials or hidden fires.
- Minimum duration is typically 30 minutes after work stops.
Memory trick: Hot mop needs a keen eye, even after the work is done, to prevent a fiery surprise.