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How Does a Plumber Check for a Slab Leak?

Benjamin Franklin Plumbers in front of a work van outside a home in Lakeland FL How does a plumber check for a slab leak?How does a plumber check for a slab leak?

Ever wondered how plumbers figure out if there’s a leak under your home’s foundation? While you might be comfortable fixing a leaky faucet, slab leaks are different. These sneaky leaks can hide for months before anyone notices them. Let’s talk about what they are and how the pros handle them.

What Is a Slab Leak?

Pipes leaking under any floor are a pain, but picture this: water leaking underneath the concrete foundation of your house. That’s a slab leak for you. Since many homes are built on concrete slabs with pipes running underneath, these leaks can be tricky to spot. They’re especially common in houses with copper pipes, which tend to wear down over time. What starts as a tiny leak can turn into a major headache if you don’t catch it early.

How Slab Leaks Develop Under a Foundation

There’s always a reason for slab leaks to occur. Here’s what usually causes them:

Ever felt a small earthquake? Those tremors can actually damage your pipes under the foundation. Even in areas where earthquakes aren’t common, the ground beneath your house never really stays still. It shifts and settles over time, which can put pressure on your pipes.

Then there’s the constant vibration from water flowing through the pipes, just like how rubbing your hands together creates friction. Over time, this can wear down the pipes. And if you’ve got copper pipes? They’re like an old car; they’ll eventually start to rust and corrode, especially if your soil is acidic.

Signs You Have a Slab Leak

I know what you’re thinking: how am I supposed to spot a leak that’s hidden under concrete? While it’s not always obvious, there are some telltale signs to watch for.

Ever walked barefoot across your floor and noticed some spots feel weirdly warm? That could be hot water leaking underneath. And that musty smell you can’t seem to get rid of? Might be moisture from a leak creating a mold party under your floor. Here’s a neat trick: late at night, when everyone’s asleep, and no one’s using water, listen carefully. Can you hear the sound of running water? That’s not normal. Oh, and keep an eye on your water bill; if it suddenly jumps without explanation, you might have found your culprit.

A Plumber Is the Best Person to Detect a Slab Leak

Look, I get it – we all love a good DIY project. But you’ll want to call in the experts when it comes to slab leaks. They’ve got some pretty cool tools in their arsenal:

Think of a ground microphone as a super-powered stethoscope; it lets plumbers hear water leaking under your floor. They’ve also got these neat video cameras that can snake through your pipes, like giving your plumbing system a colonoscopy (but way less awkward).

It’s tricky to find out where the pipe is leaking, but with the proper equipment, we can track it down.

How Plumbers Repair Slab Leaks

Once they’ve found the leak, plumbers have a few tricks up their sleeves:

Sometimes, they can fix the broken section; that’s the quick and easy solution. If that’s not possible, they might need to reroute your pipes, like creating a detour around a road closure. In worst-case scenarios, they recommend replacing all the pipes; it’s a big job, but sometimes it’s necessary. There’s also this cool new method called trenchless repair, where they can fix pipes without digging up your floor.

Need Leak Detection and Repair?

If any of these signs sound familiar, don’t wait around hoping the problem will fix itself (spoiler alert: it won’t). Slab leaks only get worse – and more expensive – over time.

If you’re in the Lakeland, FL, area, we at Benjamin Franklin Plumbing are here to help. Our team knows all about finding and fixing these pesky leaks before they can cause serious damage. Let us help you preserve the integrity of the foundation of your home.


Slab leaks might be hiding, but they’ll always leave clues if you know what to look for. Watch for those warm spots on your floor, mysterious running water sounds, and unexplained spikes in your water bill. If something seems off, it’s better to be safe than sorry.

Remember, at Benjamin Franklin Plumbing, our leak detection services are just a phone call away. Whether you need slab leak detection, slab leak repairs, or just need routine maintenance, our punctual, professional plumbers have your back. Why not give us a call and let us take a look?