MBS/Specific/TBT-MBS-006

Copper Pipe Brazing and Soldering

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Copper Pipe Brazing and Soldering

Toolbox Talk Record

Ref: TBT-MBS-006  |  Issue: 1  |  Date: March 2026
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What?

  • Brazing and soldering join copper pipework using heat from a gas torch to melt filler material into the joint.
  • Brazing uses higher temperatures (above 450°C) than soldering and creates stronger joints.
  • The work is classified as hot works — a hot works permit and fire watch are required.
  • Flux residues used in soldering and brazing are corrosive and irritating to skin and eyes.
  • Lead-free solder must be used on all potable water systems under the Water Supply Regulations.
  • Working in ceiling voids, risers, and confined spaces increases the fire risk from torch flames.
  • Fumes from flux and heated metals require adequate ventilation or respiratory protection.
  • Gas torches use propane or MAPP gas cylinders that must be stored and handled safely.
  • Fire blankets must protect adjacent combustible materials from the torch flame and radiant heat.
  • The Regulatory Reform (Fire Safety) Order 2005 applies to all hot works on construction sites.

Why?

Fire riskBrazing torches ignite timber, insulation, and cables behind walls and in ceiling voids.
Burn injuriesHeated pipe and filler material at 450°C+ cause severe contact burns instantly.
Fume exposureFlux and solder fumes irritate the lungs and can cause metal fume fever.
Water qualityUsing leaded solder on potable water systems is illegal and harms public health.
Do Don't
  • Obtain a hot works permit before any brazing or soldering work begins.
  • Protect adjacent combustible materials with fire blankets before applying heat.
  • Maintain a fire watch for at least 60 minutes after completing the hot works.
  • Use lead-free solder for all joints on potable water pipework systems.
  • Ensure adequate ventilation when brazing or soldering in enclosed areas.
  • Keep a suitable fire extinguisher within arm's reach during all hot works.
  • Inspect the gas torch, hose, and regulator for leaks before every use.
  • Store gas cylinders upright, secured, and away from heat and ignition sources.
  • Wear heat-resistant gloves and eye protection during brazing operations.
  • Clean flux residues from joints after completion to prevent corrosion.
  • DON'T braze or solder without a valid hot works permit in place.
  • DON'T use a torch in ceiling voids without checking for combustible materials first.
  • DON'T use leaded solder on any potable water pipework — it is illegal.
  • DON'T leave the torch lit and unattended at any time during the work.
  • DON'T skip the 60-minute fire watch after completing brazing or soldering.
  • DON'T braze in confined or poorly ventilated spaces without fume controls.
  • DON'T touch recently brazed joints — they remain dangerously hot for minutes.
  • DON'T point the torch flame towards gas cylinders, cables, or other personnel.
  • DON'T store gas cylinders inside buildings or near sources of heat.
  • DON'T use damaged torches, regulators, or hoses — replace them before working.

See also: Hot Works Permit Requirements | Hot Works Fire Prevention
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