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If your pipes bang, knock or shudder when you shut off a tap or the washing machine cycles, that's “water hammer”. It's not just annoying — over time it can damage fittings and joints. Here's what's going on.
Published 2026-06-01 · Cambridge Plumbers
When fast-moving water is suddenly stopped (a quick-closing tap, a washing-machine or dishwasher valve), the moving water slams to a halt and the shockwave travels back through the pipe — banging it against framing. Loose pipes, high water pressure and missing arrestors all make it worse.
Beyond the noise, repeated shock loads stress joints, valves and fittings, and can eventually cause leaks. It's a small problem that's cheap to fix now and annoying (or costly) to ignore.
We'll find the source and fix it properly rather than just quietening one symptom.
FAQ
It's not an emergency, but the repeated shock can damage fittings and cause leaks over time. Best to fix it before it does.
Usually fitting water hammer arrestors and securing loose pipes. High incoming pressure may also need a pressure-reducing valve.
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Tell us what you need and we’ll get straight back to you. For burst pipes or blocked drains, call 07 808 6936.