Pipe Materials
Pipework & Jointing · Plumbing
Copper, plastic and older materials each have their place in a home. This topic covers how to tell them apart and what each one is good for.
Copper is rigid, copes well with heat and is the familiar look of exposed pipework. Plastic pipe is flexible, quick to run under floors and does not corrode, but it needs good support and protection from heat and sharp edges.
On older jobs you may meet lead or galvanised steel. Lead pipework is a reason to stop and advise the owner rather than to work on it, and a pipe you cannot identify is traced before anyone cuts it.
Identifying a pipe also means knowing what it carries. Gas pipework can look much like copper water pipe, so no pipe is assumed to carry water because of what it is made of.
Choose for the service, not just the appearance
Updated
How to reason about the system
Water temperature, pressure, water quality, exposure and the jointing system affect material selection. A pipe's outside diameter alone does not prove compatibility with a fitting. Use the maker's specification for the complete system and learn to recognise markings before practising selection questions.
Questions to take further
- Can any plastic pipe and push-fit fitting be mixed?
- No. Compatibility depends on the system and the manufacturer's requirements, including pipe dimensions and support inserts where specified. Similar appearance is not evidence of compatibility.
Sources
- Skills England: plumbing and domestic heating technician — The systems, materials, planning and customer responsibilities in the England occupational standard.
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Lessons on the plumbing path
- Choosing a pipe material
- Identifying pipes on a job
Terms to know
Before you start: some plumbing work is regulated or notifiable
Some water fittings work needs notice to, and consent from, the water supplier before it starts. Check the rules where you live.
Gas work is for competent workers covered by a Gas Safe registered business in Great Britain. Northern Ireland has separate gas regulations. Do not work on gas pipes or appliances yourself.
In England, installing an unvented hot-water system over 15 litres is notifiable building work: use a competent installer registered with a competent-person scheme, or tell building control before work starts. Leave this work to a suitably skilled person.
Wales, Scotland and Northern Ireland have their own water and building rules; check which apply before work starts. Electrical connections belong with an electrician.
This guide does not qualify you or make you competent, approved or registered for plumbing, gas or unvented work.