Why Do Pipes Burst? Here are 5 Common Reasons Why

Why do pipes burst? It’s a common plumbing problem that can cause serious damage to your home and disrupt your water supply. If you don't fix them quickly, burst water pipes can lead to an expensive call out for emergency plumbing services as well as significant water damage and even mould growth.
There are various reasons why water pipes burst, from freezing temperatures to general wear and tear. Let’s take a look at 5 of the most common causes behind burst water pipes so you can identify the risks early and save time, money, and a whole lot of stress.
1. Freezing Temperatures and Frozen Pipes
Cold weather is one of the most common reasons why water pipes burst. When temperatures drop, water freezes inside exposed or underground pipes, causing them to freeze and expand. This creates a build-up of pressure that ultimately forces the pipe to burst.
Frozen pipes are a major risk in winter, particularly in homes with poor insulation or unprotected plumbing pipes. Freezing temperatures can affect metal, plastic and even copper pipes.
Thankfully there are ways to avoid burst water pipes. These include:
- Insulating exposed pipes.
- Leaving cabinet doors open to allow warm air to circulate.
- Keeping the water flowing slightly.
All of these will reduce the risk of ice forming in cold temperatures.
2. Excessive Water Pressure and Water Hammer
High water pressure might seem like a good thing, especially in the shower first thing in the morning. However, it can put excessive strain on your plumbing, leading to your pipes bursting.
Normal water pressure keeps water flowing smoothly. When it reaches the high water pressure stage, though, it starts to weaken your plumbing pipes. A sudden pressure surge, known as water hammer, can also damage metal pipes and plastic pipes. This results in your pipes leaking or even bursting. Built-up pressure from blocked pipes or a faulty pressure regulator can make the problem worse.
What to do about it then? A professional local plumber can check your home’s water pressure and install pressure-limiting valves to prevent burst pipes and other plumbing emergencies.
3. Tree Roots Damaging Underground Pipes
Tree roots are a hidden threat to underground water pipes. As they search for moisture to thrive, tree roots can invade small cracks in plumbing pipes. They’re a common cause of blockages, leaks, and eventually burst pipes. Over time, the pressure from growing roots weakens the pipe structure, leading to major plumbing problems.
Blocked drains caused by tree roots can also increase built-up pressure, forcing pipes to burst. Older metal pipes and even modern plastic pipes are vulnerable to root intrusion. Regular maintenance and drain inspections by a licensed plumber can identify early signs of damage, helping to prevent burst water pipes and costly repairs.
4. Poor Installation and Bad Soldering Jobs
Fourth in our list of possible answers to the question “Why do pipes burst?” is improper installation, whether from a substandard plumber or even an unlicensed DIY-er.
So, what can happen? Poorly connected joints, bad soldering jobs, and weak seals can lead to small leaks that worsen over time. Essentially, you need an experienced, licensed plumber to correctly install your pipes so they can withstand normal water pressure and temperature changes.
If fittings are loose or materials are low quality, pipes can eventually burst, causing serious water damage. Copper pipes, plastic pipes, and metal pipes all require professional training to install properly.
Hiring a licensed plumber ensures your plumbing system is fitted securely, preventing leaks, pressure issues, and future plumbing emergencies that could damage your home’s water supply.
5. Corrosion and Wear and Tear
And the final in our 5 most common answers to the question “why do pipes burst?” is simply the natural wear and tear and corrosion they experience over time.
This gradual deterioration can lead to small leaks, restricted water flow, and eventually burst pipes. Several factors contribute to the breakdown of water pipes, including:
- Hard water – Mineral build-up from hard water causes blockages and weakens pipe walls.
- Aged pipes – Ageing metal pipes, including copper pipes, corrode and become brittle.
- Underground pipes – Constant exposure to moisture accelerates rust and decay.
- Small leaks – Minor leaks weaken pipe integrity, making burst pipes more likely.
- Hot water pipes – Repeated expansion and contraction from warm water weakens joints.
Regular maintenance and inspections by a professional plumber can help prevent burst water pipes and costly repairs.
Always Call a Licensed Plumber for Burst Pipe Repairs
Burst water pipes require immediate attention, and only a licensed plumber has the expertise to fix them properly. Attempting DIY repairs can lead to further damage, higher repair costs, and even plumbing emergencies. It’s also against the law in Australia to conduct unlicensed plumbing work that involves your pipes.
A qualified plumber can assess your home’s plumbing system, detect hidden leaks, and restore normal water pressure safely. Whether it’s sealing leaks, replacing damaged pipes, or preventing future pipe bursts, experienced plumbers have the right tools and training to get the job done.
If you notice signs of a burst pipe, call a plumber ASAP to prevent water damage and protect your home’s water supply.
Keep Your Water Pipes Burst-Free
From the bathroom to the kitchen sink, knowing how to answer “why do pipes burst?” can help you prevent costly damage and plumbing issues.
Freezing temperatures, high pressure, tree root intrusion, poor installation, and corrosion are some of the most common reasons pipes burst. Regular maintenance, proper insulation, and professional plumbing services can keep your water pipes in top condition. If you suspect a burst water pipe, don’t wait. Get on the phone immediately with a licensed plumber who can help you prevent further damage.
A well-maintained plumbing system ensures reliable water flow and protects your home from unexpected plumbing problems. Stay proactive and take steps to prevent burst water pipes before disaster strikes.
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