Plumber Heatherton VIC 3202 – Water Hammer Repaired with Pressure Regulation

Overview of the Problem – Loud Banging Pipes in the Laundry Wall

At a property on Pinehurst Way in Heatherton VIC 3202, our team at Your Choice Plumbers was called out after the homeowner reported a loud banging noise coming from the laundry wall whenever the washing machine was running.

The sound was severe enough to make the owner worry that the pipes inside the wall might be loose or failing. Like many homeowners, she was concerned the only solution might involve cutting open the plaster and carrying out major repair work behind the wall.

This is exactly the type of situation where homeowners start asking, “why do my pipes bang when the washing machine runs?” or “does water hammer mean pipes are loose inside the wall?” As an experienced plumber Heatherton, we often find that loud pipe noise is not always caused by loose pipe clips or structural movement inside the wall — in many cases, the real issue starts at the water meter.

Why This Was More Than Just a Noisy Pipe

The symptom the homeowner noticed was the banging noise, but water hammer is usually the result of a bigger system problem.

In modern homes, fast-closing appliances like washing machines shut their internal valves very quickly. When the incoming water is moving too fast and under too much pressure, that sudden stop creates a shockwave through the pipework.

That shockwave is what causes:

• banging or knocking sounds
• pipe vibration inside walls
• stress on fittings and joints
• long-term wear on valves and appliances

This is something we often explain on water hammer solutions jobs, because the noise itself is only the symptom — the real cause is often excessive water pressure and water velocity through the home.

Pressure Testing Confirmed the Real Cause

Before suggesting any invasive work, we carried out a static water pressure test at the property.

The reading came back at 750 kPa.

That is well above the 500 kPa maximum referenced under AS/NZS 3500 and immediately explained why the washing machine was creating such aggressive pipe noise.

At that pressure, the water moving through the pipework had too much force behind it. Every time the washing machine snapped its internal solenoid valve shut, the shockwave had nowhere to dissipate properly.

That meant the banging noise was not being caused by a defect in the wall — it was being driven by excessive system pressure.

This is also something we often explain on pressure limiting valve and PRV installation jobs, because water hammer is very often the result of overpressure rather than a hidden pipe break or structural failure.

Why High Water Pressure Was the Bigger Household Risk

We explained to the homeowner that the laundry noise was effectively a warning sign.

At 750 kPa, the home’s plumbing system was not just noisy — it was also being exposed to unnecessary stress that could shorten the life of:

• washing machine valves
• toilet internals
• mixer cartridges
• flexible hoses
• pipe joints and fittings
• hot water system components

So while the loud banging in the laundry was the problem the owner noticed first, the real issue was that the entire home was running above the recommended safe pressure.

Solving the Problem at the Source Instead of Opening the Wall

Because the pressure test clearly identified the cause, we were able to solve the issue without cutting into the plaster at all.

We sourced a high-performance Zurn in-line pressure reducing valve from Reece Plumbing Clayton and installed it at the water meter.

This was the right solution because it regulated the water supply for the whole home before it could continue creating excessive force through the internal pipework.

Once installed, we commissioned the valve and brought the pressure down to a consistent and compliant 500 kPa.

Why Pressure Regulation Eliminated the Noise

Reducing the incoming pressure also reduced the speed and force of the water travelling through the pipes.

In practical terms, that meant when the washing machine valves shut quickly, the water no longer slammed back through the pipework with the same aggressive shockwave.

Instead of trying to silence the noise at the wall, we removed the cause of the noise at the source.

This is why water hammer solutions and pressure regulating valve work often go hand in hand — one addresses the symptom, and the other corrects the system condition causing it.

Final Testing and Client Outcome

Once the new valve was installed and calibrated, we tested the laundry plumbing again under live operating conditions.

We ran the laundry appliances through several cycles and confirmed:

• the banging noise had disappeared
• the system was now operating at compliant pressure
• the homeowner no longer needed to worry about invasive wall repairs
• the wider plumbing system was better protected from long-term pressure stress

The owner was extremely relieved that the issue had been solved properly without any messy or expensive wall opening works.

Outcome and Client Result

• severe banging pipe noise in the laundry diagnosed properly
• static water pressure tested at 750 kPa
• high pressure confirmed as the real cause of the water hammer
• new Zurn in-line pressure reducing valve installed at the meter
• home pressure reduced to a compliant 500 kPa
• laundry pipe noise eliminated without opening the wall

The homeowner was very pleased that the problem was solved cleanly and that the same repair also helped protect the rest of the home’s plumbing.

Compliance with Australian Standards

This case directly related to the pressure control requirements referenced under AS/NZS 3500, which requires residential water pressure to be regulated to a maximum of 500 kPa.

In practical terms, this meant the solution was not to cut open the wall chasing the noise. The correct solution was to reduce the excessive system pressure that was causing the water hammer shockwave in the first place.

All work carried out by Your Choice Plumbers is completed in accordance with the relevant plumbing standards so noisy pipe issues are diagnosed at the source and not just treated at the symptom level.

Our Home Plumbing Experts Approach

As part of our Home Plumbing Experts approach, we focus on both repair and prevention.

We include our complimentary Property Protection Audit with plumbing services to help homeowners understand hidden risks like excessive water pressure, unsafe hot water temperatures, and ageing flexible hoses before they turn into emergencies.

Find out more about our water hammer solutions and pressure limiting valve and PRV installation services.

Looking for a Plumber in Heatherton?

If you’re dealing with banging pipes, noisy laundry plumbing, or suspect high water pressure is affecting your home, visit our Plumber Heatherton page to learn more about how we help local homeowners.