What Causes Water Hammer (Banging Pipes), and How Can I Stop It?
If you’ve ever turned off a tap and heard a loud banging noise in your pipes, you’ve likely experienced water hammer. It can be startling and, if left unchecked, damaging to your plumbing system. The good news is that water hammer can be fixed, but first, it helps to understand what’s causing it.
At A Grade Plumbing & Gas, we’ve helped countless homeowners across Brisbane, the Sunshine Coast, the Gold Coast, and Ipswich tackle noisy pipe issues and prevent costly damage. Here’s what you need to know.
What Exactly Is Water Hammer?
Water hammer occurs when the flow of water in your pipes abruptly stops or shifts direction. This surge creates a shockwave that rattles the pipes, often producing a loud banging or knocking sound.
It’s most common when taps are turned off quickly or when appliances like washing machines and dishwashers shut off their water supply suddenly. While the sound is annoying, the bigger concern is the strain it places on your plumbing over time.
Common Causes of Water Hammer
-
Loose or Poorly Secured Pipes
Pipes that aren’t firmly fastened to walls or joists can move around when water surges through them. This movement amplifies the banging noise.
-
High Water Pressure
Excessively high water pressure can make water hammer worse. This occurs when the flow of water is suddenly forced to stop or change direction, resulting in a loud banging sound in the pipes. Over time, these pressure surges can loosen washers and seals inside taps, which often leads to leaks and makes leaking tap repairs a frequent need. Not only does this cause noisy pipes, but it can also damage fixtures if left unaddressed.
-
Faulty or Worn Valves
Appliances like washing machines rely on valves to regulate water flow. When these valves close too abruptly, the rushing water has nowhere to go, resulting in that tell-tale hammering sound.
-
Air Chambers or Arrestors Not Working
Some plumbing systems are fitted with air chambers or water hammer arrestors to absorb shockwaves. Over time, these can lose effectiveness, allowing noise and vibration to return.
How to Fix Water Hammer
Check Water Pressure
Your first step should be checking your home’s water pressure. If it’s above the recommended level (generally around 500 kPa), a licensed plumber can install a pressure-reducing valve to keep things in check.
Secure Loose Pipes
Fastening pipes with proper brackets or clips can reduce movement and prevent banging. While this can be a DIY job in some cases, a professional plumber can ensure pipes are secured correctly and safely.
Install Water Hammer Arrestors
These devices act like cushions, absorbing the shockwave that causes water hammer. They’re especially useful for modern homes with multiple water-using appliances.
Service Valves and Fixtures
Sometimes, noisy pipes are linked to faulty or worn-out valves. Having your fixtures and appliances checked regularly can prevent hammering and save you from unexpected repairs.
Why Water Hammer Shouldn’t Be Ignored
Water hammer isn’t just a noisy nuisance; it can lead to:
- Pipe damage from repeated vibrations.
- Leaks and bursts, especially in older pipework.
- Appliance wear, as the shock impacts valves and connections.
Ignoring the issue could leave you needing more serious work down the track, from pipe replacements to hot water repairs.
When to Call a Professional Plumber
If water hammer continues despite basic fixes, it’s time to call in the experts. At A Grade Plumbing & Gas, our licensed plumbing team can:
- Diagnose the root cause of noisy pipes.
- Install or replace valves, arrestors, or fittings.
- Adjust water pressure to safe levels.
- Inspect for hidden leaks that could worsen over time.
And because plumbing problems rarely happen at convenient times, we also provide 24/7 help as your local emergency plumber in Brisbane.
Other Plumbing Services We Offer
Water hammer is just one of the many issues we solve. Our friendly team can also assist with:
- Blocked drain services – clearing blockages before they cause odours or damage.
- Hot water repairs – restoring reliable hot water quickly.
- Bathroom renovations – upgrading old bathrooms with modern, functional plumbing.
- Leaking tap repairs – stopping drips and saving water.
No matter the plumbing challenge, we’re here to help Brisbane homeowners keep their systems running smoothly.
Protect Your Home from Noisy Pipes
Don’t let water hammer damage your pipes or stress you out every time you turn off a tap. If you’re dealing with banging pipes or any plumbing issue, contact A Grade Plumbing & Gas today on (07) 3290 2245. We’re your trusted local team.