Water Hammer: Noisy Pipes in Edinburgh Homes

Water Hammer: Noisy Pipes in Edinburgh Homes

What It Is, Why It Happens, and How to Stop It

Are you hearing loud banging noises in your pipes when you turn off a tap or your washing machine finishes a cycle? That sound is likely water hammer—a common plumbing issue that’s both annoying and potentially damaging if left unresolved.

At Able Girl Plumbing, we regularly help homeowners across Edinburgh tackle noisy plumbing. This article explains what water hammer is, why it happens, and what you can do to fix it for good.

What Is Water Hammer?

Water hammer, also known as hydraulic shock, occurs when moving water is forced to stop or change direction suddenly. This rapid stop sends a pressure wave through the pipes, which causes the banging or knocking sound you hear—often described as a loud thud behind the walls.

It’s most commonly triggered when a tap, valve, or appliance shuts off water quickly.

Where It Happens Most

Water hammer can occur throughout your plumbing system, but it's particularly common in:

• Washing machines and dishwashers, where solenoid valves close quickly
• Taps or mixer taps that are turned off abruptly
• Toilet cisterns, especially older models
• Outdoor garden taps if water is shut off at high pressure

While toilets may be a common source, they're just one of many potential triggers—especially in Edinburgh homes, where plumbing systems vary widely in age and design.

Why It’s Common in Edinburgh

Several factors make water hammer a frequent issue in this area:

🏠 Older Properties

Many homes in Edinburgh—from traditional tenements to older cottages—still have original or outdated pipework, which lacks modern protections against water hammer.

💧 High Water Pressure

Certain areas of the city experience high mains water pressure. This makes any sudden valve closure more forceful, which amplifies the shock through your plumbing.

🔧 Unsecured Pipework

Pipes that aren’t properly clipped or supported can move when shockwaves pass through them, which makes the noise more noticeable and damaging.

Is Water Hammer Harmful?

Yes—if left untreated, water hammer can eventually cause:

• Damage to pipe joints and fittings
• Loosened valves or connections
• Small leaks or long-term wear on your plumbing system
• Increased strain on appliances like washing machines and dishwashers

It’s not an emergency—but it’s definitely worth fixing before small issues turn into bigger ones.

Signs You Have Water Hammer

• Loud banging when taps or appliances shut off
• Pipes rattling or shaking inside walls
• Sounds after the washing machine or dishwasher fills
• Occasional leaks or drips from joints or fittings

How to Fix or Prevent Water Hammer

There are a few effective ways to address water hammer in your home:

1. Install Water Hammer Arrestors

These small devices absorb the shockwave and protect your plumbing system. They’re commonly fitted near appliances or taps where the noise is most frequent.

2. Secure Loose Pipework

If your pipes are rattling or moving, they may just need to be properly clipped or supported. This is a simple but effective fix—especially in older homes.

3. Add a Pressure-Reducing Valve (PRV)

If your home has particularly high mains pressure, a PRV can regulate the flow and reduce the likelihood of water hammer.

4. Replace Fast-Closing Valves

Some appliances or taps close water flow too abruptly. Replacing them with slower-closing valves or taps can soften the shut-off and reduce shock.

5. Bleed Air from the System

Air trapped in the pipes can sometimes make water hammer worse. Bleeding your plumbing system (or having a plumber do it) can help in some cases.

When to Call a Professional

If you’ve tried the simple steps and the noise continues—or if you’re not sure what’s causing it—it’s best to call a qualified plumber.

At Able Girl Plumbing, we can quickly diagnose the source of water hammer, recommend the best fix, and carry out the work safely and efficiently. We work in all types of Edinburgh properties, from modern flats to period homes.

Final Thoughts

Water hammer is more than just an irritating noise—it’s a warning sign that something in your plumbing system needs attention. Whether it’s happening at your kitchen tap, outside garden hose, or when your washing machine kicks in, we can help you stop the banging for good.