HOT/Specific/TBT-HOT-020
Hot Works Fire Watch Duration Requirements
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Toolbox Talk
Hot Works Fire Watch Duration Requirements
Hot works fire watch is the period after welding, cutting, or grinding has finished during which a trained person monitors the area for signs of fire. Smouldering materials can take considerable time to ignite, and fires frequently start well after the hot works activity has ended. Cutting the fire watch short is one of the most common causes of fire on construction sites. This talk explains the fire watch requirements and why they must never be reduced.
Key Hazards
Delayed ignition of smouldering materials after hot works finish
Fire spreading undetected when the work area is left unmonitored
Combustible materials in hidden voids igniting after the area appears safe
Loss of property and life from fires starting during the night after daytime hot works
Control Measures
- Maintain a fire watch for a minimum of 60 minutes after all hot works cease, or longer if specified.
- Assign a trained fire watcher who remains at the work location throughout the fire watch period.
- Ensure the fire watcher has a suitable fire extinguisher and means of raising the alarm.
- Inspect the area above, below, and behind the work location for signs of heat transfer or smoke.
- Check concealed voids, cavity walls, and behind cladding where embers may lodge unseen.
- Record the fire watch start time, end time, and the name of the fire watcher on the hot works permit.
- Do not leave the area unattended for any reason during the fire watch period.
- Extend the fire watch duration in buildings with combustible materials, insulation, or timber frames.
- Brief the fire watcher on the specific materials and construction in the vicinity before starting.
Remember
- The fire watch must last at least 60 minutes after hot works cease, or longer if specified
- A trained fire watcher must remain at the location for the entire fire watch period
- Inspect hidden voids, cavities, and spaces behind cladding where embers may lodge
- Record the fire watch details on the hot works permit including times and names
- Never leave the area unattended during the fire watch period for any reason
Applicable Legislation: Regulatory Reform (Fire Safety) Order 2005 · CDM 2015 · Health and Safety at Work etc. Act 1974 · Joint Code of Practice (Fire Prevention on Construction Sites)
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