Water hammer is a pressure surge caused by a sudden change in water flow. High pressure, pipe movement and fast-closing appliance valves can contribute to banging. The right repair starts with checking the cause.
Those mysterious banging pipes.
Have you ever turned off a tap only to hear an alarming bang echo through your home’s plumbing? That startling noise is often called water hammer, or hydraulic shock. It can be a sign that the plumbing needs attention.
Water moving through a pipe has momentum. When a valve closes quickly, the change in flow creates a pressure surge. The sound may be strongest near one appliance or seem to travel through the building.
Not every plumbing noise has the same cause. Tell us whether you hear a single bang, repeated knocking, a vibration or a noise while water is still running. That detail helps with the assessment.
More than an annoying noise.
The real concern is what is happening inside and around the pipework. Repeated movement and pressure changes can put stress on joints, supports, valves and appliance connections.
- Pipe joints and connections may develop leaks.
- Loose supports can allow pipework to move and knock against nearby surfaces.
- Appliance connections and valves may need checking.
- A small fault can become harder to deal with if it is left unassessed.
A noise alone does not tell you how much damage has occurred. If you also notice dampness, a visible leak or a sudden change in water flow, include that when you contact the team.
What can cause water hammer?
High water pressure
Excessive pressure can place extra stress on plumbing and make pressure surges more noticeable. A plumber can measure the pressure and check the existing pressure-control equipment. Noise alone is not a pressure measurement.
Loose pipework
Pipes that are not adequately supported can move when water flow changes. The location, condition and compatibility of the supports need checking before repairs are recommended.
Fast-closing appliance valves
Washing machines and dishwashers use valves that can close rapidly. If the bang happens during a particular cycle, make a note of the appliance and when the sound occurs.
Worn taps, valves or existing control devices
Worn components can contribute to vibration and noise. Existing air chambers or water-hammer control devices may also need assessment. The plumbing layout determines which parts should be checked.
The solution depends on the findings.
A plumber can explain the options once the pressure, fixtures and pipework have been assessed. The work might involve repairing a valve, improving pipe supports, checking a pressure-reducing valve or installing a suitable water-hammer arrestor.
An arrestor is intended to absorb the pressure change at an appropriate point in the installation. Selecting and locating it correctly matters. Fitting a device without checking the cause may leave the underlying issue unresolved.
Quieter does not always mean fixed. Covering or cushioning a pipe may reduce the sound without correcting excessive pressure or a worn valve. Discuss the cause before deciding on the repair.
Our pipe and valve repair service can help assess affected connections. If water is already escaping, explain where it appears and whether the fault is getting worse.
When should you call a plumber?
Arrange an assessment if the noise keeps returning, affects several fixtures or begins after an appliance or fitting is changed. Call promptly if it is accompanied by a leak or water damage.
Before the visit, note which tap or appliance triggers the noise, when it began and any earlier repairs. You do not need to diagnose the problem yourself or enter a roof space to collect those details.
For ongoing maintenance, ask about checking pressure, visible pipe supports and ageing fixtures. The condition of your system will guide the appropriate work and maintenance schedule.
Contact Kyle and the Jetty Plumbing team on 0459 339 205 or send an enquiry with the property address and symptoms.
Kyle leads the Jetty Plumbing team on the Coffs Coast. For advice about your own property, share the job details with us.
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