Key Takeaways
✓ Water hammer is caused by sudden water flow stoppage creating shockwaves in your pipes
✓ Most cases can be fixed by adjusting water pressure, securing loose pipes, or installing arrestors
✓ DIY fixes work for simple cases, but persistent banging needs a licensed plumber
✓ Left untreated, water hammer can damage pipes, joints, and appliances over time
If your pipes sound like someone's hammering inside your walls, you're dealing with water hammer and you're not alone. It's one of the most common plumbing complaints we hear at Apex Trades.
What Is Water Hammer? (And Why Your Pipes Bang)
You'll typically notice it when you quickly turn off a tap, or when appliances like washing machines or dishwashers shut off their water valves. Modern appliances use fast-acting solenoid valves that close in milliseconds, which makes water hammer more common in newer homes despite older plumbing being more prone to the issue.
The sound can range from a single thud to repeated banging that seems to travel through your walls. In severe cases, we've seen water hammer literally shake pictures off walls in homes around Carlton and Richmond.
What Causes Water Pipes to Make Noise?
Several factors contribute to water hammer and pipe noise:
High water pressure. This is the number one cause in Melbourne. Our water pressure typically runs between 50-80 PSI, but some areas particularly in low-lying suburbs near the Yarra or areas with new infrastructure can see pressure spikes above 100 PSI.
Loose pipe brackets. Over time, the clips and brackets holding your pipes can loosen from vibration, building settlement, or just age. When pipes aren't properly secured, water hammer causes them to bang against timber frames or each other.
Failed air chambers. Older plumbing systems have built-in air chambers short vertical pipes that act as cushions for water shockwaves.
Fast-closing valves. Modern washing machines, dishwashers, and even contemporary tap designs close their valves much faster than older models.
When Should You Call a Professional Plumber?
Some water hammer situations need professional help:
Persistent noise after DIY attempts. If you've tried basic fixes and the hammering continues, there's likely a more complex issue possibly damaged pipes, concealed loose sections, or pressure problems requiring valve replacement.
No access to pipes. Modern homes with pipes running through concrete slabs or behind tiled walls need professional diagnosis and installation of arrestors at accessible points.
Signs of damage. If you notice water stains, dampness, or leaking joints after water hammer episodes, you may have damaged pipes that need immediate attention. Water hammer can crack joints, split pipes, and damage appliance connections over time.
Whole-house problems. If every tap and appliance causes hammering throughout your home, you likely need a comprehensive solution including pressure regulation and multiple arrestors installed strategically.
We regularly service homes throughout Melbourne's inner suburbs where water hammer has gone untreated for months or years. In one South Yarra apartment, prolonged water hammer had cracked a concealed copper joint, causing hidden water damage that cost thousands more than the original fix would have.
When Should You Call a Professional Plumber?
Some water hammer situations need professional help:
Persistent noise after DIY attempts. If you've tried basic fixes and the hammering continues, there's likely a more complex issue—possibly damaged pipes, concealed loose sections, or pressure problems requiring valve replacement.
No access to pipes. Modern homes with pipes running through concrete slabs or behind tiled walls need professional diagnosis and installation of arrestors at accessible points.
Signs of damage. If you notice water stains, dampness, or leaking joints after water hammer episodes, you may have damaged pipes that need immediate attention. Water hammer can crack joints, split pipes, and damage appliance connections over time.
Whole-house problems. If every tap and appliance causes hammering throughout your home, you likely need a comprehensive solution including pressure regulation and multiple arrestors installed strategically.
We regularly service homes throughout Melbourne's inner suburbs where water hammer has gone untreated for months or years. In one South Yarra apartment, prolonged water hammer had cracked a concealed copper joint, causing hidden water damage that cost thousands more than the original fix would have.
How Can You Prevent Water Hammer and Plumbing Noise?
Prevention is straightforward and much cheaper than repairs:
Install arrestors during renovations. If you're renovating your kitchen, bathroom, or laundry, this is the perfect time to install water hammer arrestors. They should be standard in any modern plumbing installation, but many renovations skip them to save costs—a false economy.
Maintain proper water pressure. Check your pressure annually. Melbourne's water pressure can change due to infrastructure upgrades, new developments in your area, or changes to the distribution network.
Secure pipes properly during installation. If you're having new plumbing work done, ensure pipes are properly bracketed with cushioning. We see a lot of rushed installation work that creates problems within months.
Replace old stop taps. Modern quarter-turn taps close very fast and increase water hammer risk. If you have them, proper pressure regulation and arrestors become even more important.
What Do Other Plumbing Noises Mean?
Not all pipe noise is water hammer:
Rattling pipes usually indicate loose mounting that needs securing. The noise occurs when water flows, not just when it stops.
Whistling sounds suggest a partially closed valve, mineral buildup restricting flow, or a washer that needs replacing in a tap.
Creaking or ticking in pipes, especially in mornings or evenings, is often thermal expansion, copper pipes expanding as hot water passes through them. This is normal unless excessive.
If you're hearing any of these sounds throughout your home, it's worth having a comprehensive plumbing inspection to identify issues before they escalate.
Need Help Fixing Noisy Pipes in Melbourne?
Water hammer might seem like a minor annoyance, but left untreated it can damage your plumbing system, stress pipe joints, and potentially lead to leaks and water damage. If DIY fixes haven't solved your problem, or you want professional installation of water hammer arrestors, Apex Trades can help.
We service homes across Melbourne's inner and middle suburbs with same-day availability for urgent issues. Our licensed plumbers carry arrestors and can install them on-site during the service call. We'll also check your water pressure, inspect for loose pipes, and ensure your entire system is properly protected.
Call 1300 102 158 for fast, professional water hammer repairs throughout Melbourne, or contact us online to schedule a service.