Understanding 'Water Hammer'—That Loud Banging in Your Pipes (and How to Fix It)

Ever turned off the tap and suddenly heard a loud bang in the wall? Or maybe it sounded like someone smacked the pipes with a hammer. It’s not just in your head — it’s called water hammer, and it’s more common in Perth homes than most people realise.

It might not seem like a big deal at first, but if left alone, water hammer can lead to busted fittings, broken valves, or even burst pipes. That annoying banging is your plumbing system yelling for help.

Let’s break down what causes it, why it happens in places like Seven Hills, and what you can do to make it stop.



So, What Exactly Is Water Hammer?

Think of water like a fast-moving train. When it’s flowing through your pipes and you suddenly shut off a valve (like turning off a tap or your washing machine stops filling), that flow slams into a closed gate. There’s nowhere for that energy to go.

The result? A loud bang — sometimes one, sometimes a series. That’s the “hammer” sound. It’s water trying to keep moving, but hitting a dead end. And if your pipes aren’t secured properly or there’s too much pressure, they’ll rattle or knock against your walls or each other.

Common Causes of Noisy Pipes in Perth Homes

Now, not all pipe noise is water hammer. But if you’re hearing loud bangs, here’s what might be causing it:

1. High Water Pressure

If the water pressure in your home is too strong, it increases the force of that sudden stop. More pressure = louder noise = higher risk of pipe damage.

2. Quick-Shut Valves

Modern appliances like washing machines and dishwashers often have fast-acting solenoid valves. These shut off water instantly — perfect for the machine, but tough on old pipework.

3. Loose Pipes in the Walls

If your pipes aren’t clipped properly or are too close to walls or studs, any vibration from sudden water stoppage causes them to knock.

4. Air Chambers That Stopped Working

Some homes have vertical pipes (air chambers) near taps that help absorb shock. Over time, these fill with water instead of air — and stop doing their job.

Why Water Hammer Is a Bigger Deal Than It Sounds

A bang here or there might seem harmless. But behind the scenes? It’s doing damage.

  • Over time, water hammer can loosen pipe joints
  • Valves and seals in appliances wear out faster
  • Pipes can crack or burst from repeated shock
  • It stresses your hot water system and taps
  • And yes — it’s super annoying if you like peace and quiet

It’s especially common in older Perth suburbs or areas like Seven Hills, where plumbing hasn’t been updated in years or pressure hasn’t been properly balanced.

How to Know If It’s Actually Water Hammer

Water hammer usually happens under specific conditions:

  • Right after turning off a tap quickly
  • When your washing machine or dishwasher shuts off mid-cycle
  • After using the garden hose and turning it off abruptly
  • You hear a single or repeated banging sound from the walls or ceiling

If any of that sounds familiar — it’s probably water hammer. And you’re definitely not alone. It’s one of the most common complaints plumbers in Perth and Seven Hills deal with.

Quick DIY Checks Before You Call a Plumber

Want to try sorting it out yourself before picking up the phone? Fair enough.

Here are a few safe, DIY steps:

1. Turn Off the Water and Drain the System

Sometimes air chambers just need refilling. Try this:

  • Turn off the main water supply
  • Open all taps in the house (hot and cold)
  • Flush the toilet and run garden taps
  • Wait a few minutes, then shut all taps
  • Turn the main back on

This resets pressure and reintroduces air into the system. Sometimes it works — worth a shot.

2. Check Appliance Hoses

If the banging happens during a wash cycle, the culprit might be a loose washing machine hose. These can vibrate like crazy. Tighten the fittings and see if the noise calms down.

3. Install Tap Cushions or Arrestors (If You’re Handy)

If you're a bit of a DIY type, you can get water hammer arrestors from Bunnings. These absorb the shock of fast water stoppage. They’re especially useful behind dishwashers and washing machines. But if you're not confident — leave this bit to the pros.

When to Call a Plumber in Seven Hills or Perth

If none of that works? Or if you don’t want to mess with your mains water system? Call a licensed plumber in Seven Hills or nearby.

Here’s what they can do:

  • Test your water pressure
  • Inspect internal pipe fittings (without breaking walls)
  • Add proper clips or insulation to vibrating pipes
  • Replace outdated shut-off valves or add pressure-reducing valves
  • Install proper water hammer arrestors for long-term protection

They’ll also make sure the noise isn’t something more serious — like a leak hidden behind a wall or a pipe starting to split.

Can Water Hammer Be Prevented?

Yes. In fact, if you’re building a new home or renovating, it's the best time to get it right. Proper pipe spacing, pressure regulation, and using modern anti-hammer devices from the start means you likely won’t hear that loud knock again.

For existing homes, prevention looks like:

  • Annual plumbing inspections
  • Replacing worn-out washers, valves, or hoses
  • Keeping water pressure in the recommended range (typically 500 kPa or less)
  • Updating old tapware with slower-closing models

Final Thoughts

Water hammer might sound like a minor annoyance, but it’s usually a symptom of something deeper — pressure issues, outdated fittings, or unsecured pipes.

If you're hearing that telltale banging or clanking noise around your home, don’t ignore it. Over time, it can lead to real plumbing damage. And let’s be honest — it’s not exactly pleasant to live with.

Whether you're in the heart of Perth or up in Seven Hills, noisy pipes aren't normal — and fixing them might be easier than you think.

FAQs

1. What exactly is water hammer?
It’s the loud bang you hear when flowing water suddenly stops, causing a pressure shockwave in your pipes.

2. Is water hammer dangerous?
Yes — over time, it can damage pipes, valves, and appliances.

3. Can I fix water hammer myself?
Sometimes. Draining the system or tightening hoses might help. But for lasting fixes, a plumber is best.

4. What’s a water hammer arrestor?
It’s a device that absorbs the shockwave and stops the banging noise.

5. Does water pressure cause water hammer?
High water pressure makes it worse, yes.

6. Will water hammer go away on its own?
Usually not. In fact, it often gets worse as parts wear down.

7. Is it more common in old homes?
Definitely. Older pipes, loose fittings, and outdated valves make it more likely.

8. Can a Perth plumber fix water hammer easily?
In most cases, yes. It’s a routine job for experienced plumbers.

9. Do all homes need arrestors?
Not all — but any home with modern appliances or fast-closing valves can benefit.

10. How much does it cost to fix?
It varies. A basic repair might be under $200. Full solutions like pressure valves or arrestors can cost more, but save money long-term.

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