Pipe Joints and Fixings
Pipework & Jointing · Plumbing
A joint is where most leaks start. This topic looks at the common ways water pipes are joined, and how a run of pipe is supported and protected.
Compression fittings grip the pipe with a nut and an olive, push-fit fittings hold it with a grab ring and a seal, and press-fit fittings are crimped on with a tool. Soldered joints are made with heat, which brings fire precautions with it.
Whatever the method, a sound joint starts with a pipe cut square, cleaned, deburred and fully inserted, then supported so that the joint is not under strain.
Pipe runs need clips at sensible spacings, sleeves where they pass through walls, and protection wherever they could be damaged or could freeze. All of this is about water pipework only, never gas.
A joint and its support work together
Updated
How to reason about the system
A leak-free connection can still be strained by unsupported pipework, movement or expansion. Revision should connect joint type, material, access and support to the service conditions. Installation details belong to the relevant system manufacturer's instructions and supervised training.
Questions to take further
- Does a joint that looks dry immediately prove the work is finished?
- No. Appropriate testing, inspection and checking the system under its intended conditions are part of the work. Access for maintenance and suitable support matter too.
Sources
- Skills England: plumbing and domestic heating technician — The systems, materials, planning and customer responsibilities in the England occupational standard.
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Original plumbing learning material. For revision only; do not use samples to guide work on site.
Learning content, not a qualification: it won't make you competent, certified or registered. Follow the regulations that apply and a qualified plumber before acting. About our content
Lessons on the plumbing path
- Making a sound joint
- Push-fit and press-fit joints
- Supporting and protecting pipework
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.