MBS/Specific/TBT-MBS-006

Copper Pipe Brazing and Soldering

Mechanical Building Services › Specific › Copper Pipe Brazing and Soldering

Presenter		Project
Location		Date

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.

Fire risk	Brazing torches ignite timber, insulation, and cables behind walls and in ceiling voids.
Burn injuries	Heated pipe and filler material at 450°C+ cause severe contact burns instantly.
Fume exposure	Flux and solder fumes irritate the lungs and can cause metal fume fever.
Water quality	Using leaded solder on potable water systems is illegal and harms public health.

Don't

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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