Hot Work and Torch Safety

Why it matters

Torch-down roofing, brazing, and cutting all leave something behind you cannot see: heat soaked into the deck, smoldering insulation, a spark in the wall cavity. Most hot-work fires start after the torch is off. The fire watch is not a formality; it is the job.

Hazards

• ⚠ Fires starting in hidden spaces: wall cavities, insulation, under membranes
• ⚠ Combustibles within the spark and slag radius
• ⚠ Cylinders stored or moved wrong: valves unprotected, oxygen next to fuel gas
• ⚠ Fires discovered after the crew has packed up and left
• ⚠ Torching over coatings that release toxic fumes when heated

Controls and safe practices

• ✓ Clear or protect combustibles 35 feet around the work. Cover what cannot move with fire blankets.
• ✓ Charged extinguisher within reach at the work point, not in the truck.
• ✓ Post a fire watch during work and for at least 30 minutes after the last flame.
• ✓ Check hidden sides: the other side of the wall or deck you are heating.
• ✓ Store cylinders upright, capped, and secured. Oxygen separated from fuel gas by 20 feet or a barrier.
• ✓ Test hoses and fittings for leaks before lighting. Light with a striker, never a lighter.

Crew discussion questions

1. Where is today’s hot work happening and what is on the other side of that surface?
2. Who is the fire watch and do they know the 30-minute rule?
3. Where are the extinguishers at the work point?
4. How are the cylinders being stored and moved today?

Applicable OSHA standards

29 CFR 1926.352, 29 CFR 1926.354

More toolbox talks

• Ladder Safety
• Fall Protection Basics
• Heat Illness Prevention
• Lockout / Tagout: Controlling Energized Circuits
• Trench and Excavation Safety
• Silica Dust Control

Safety plans by trade

RoofingHVAC / MechanicalPlumbingAll toolbox talks