Have you ever opened a cabinet or walked into your basement to find standing water? It’s one of the worst plumbing surprises a homeowner can face—and it’s often the result of a burst pipe.
While the symptoms are usually obvious, the causes aren’t always. Knowing why pipes burst can help you prevent damage before it happens. In some cases, especially in older homes, repiping the whole house may even be the best solution.
7 Common Reasons Pipes Burst
Let’s break down the top causes of pipe bursts—plus how to stay ahead of them.
1. Freezing Temperatures
In winter, pipes exposed to cold air can freeze. When water freezes, it expands—adding pressure that can crack or burst the pipe. Outdoor faucets, sprinkler lines, and poorly insulated pipes are common trouble spots.
💡 Prevention tip: Wrap exposed pipes and keep your home above 55°F.
2. Tree Root Invasion
Roots naturally grow toward moisture. If your sewer line has even a small crack, roots can infiltrate, clog the pipe, and eventually cause it to break. This often starts slow—until pressure builds and the pipe gives way.
3. Rust and Corrosion
Older pipes, especially those made of galvanized steel, can corrode over time. Corrosion weakens the pipe walls, eventually leading to leaks or bursts. If your pipes are more than 30–40 years old, it may be time to consider replacement.
4. Clogs and Blockages
Hair, grease, food scraps, wipes, and even small toys can block pipes. When pressure builds behind the clog, it can lead to a rupture—especially in older or narrow lines.
5. Accidental Damage
Pipes can burst from impacts—such as hitting a line while digging or dropping something heavy on exposed plumbing. Even well-installed pipes aren’t immune to physical damage.
6. High Water Pressure
Excessive water pressure puts stress on your plumbing system. Over time, this constant force can wear down pipes and fittings, leading to leaks or sudden bursts.
✅ Use a pressure gauge to check the pressure in your system. If you’re consistently over 80 PSI, install a pressure-reducing valve.
7. Poor Installation
DIY plumbing may save money upfront—but if pipes aren’t installed correctly, leaks or bursts are more likely to occur. Pipes must be properly supported, sized, and connected to prevent future issues.
How to Prevent Your Pipes From Bursting
Here are practical ways to protect your home:
- Insulate exposed pipes – especially those in attics, crawl spaces, and exterior walls
- Keep indoor temps stable – don’t let your home drop below 55°F in winter
- Schedule plumbing inspections – every 1–2 years to help catch issues early
- Clear out slow drains – gurgling, slow water flow, or smells can signal a clog
- Monitor your water pressure – too high? Adjust it or install a regulator
- Hire professionals for major work – especially full installs or remodels
Final Thoughts
Burst pipes can cause thousands of dollars in damage—fast. If your home has aging pipes, frequent clogs, or visible corrosion, it may be time to consider a permanent solution, such as repiping your home.
At P&L Plumbing, we help East Valley homeowners prevent pipe damage before it starts. Whether you need emergency repair or a complete system update, we’ve got your back.
Call today to schedule an inspection or get a free quote from a licensed local plumber.