Why Do Basements Get Wet?

Why Do Basements Get Wet?

Water is one of the biggest troublemakers for homeowners. It can sneak in through a leaking roof, a plumbing issue, or poor grading—but more often than not, it finds its way in through the foundation walls. Unlike a burst pipe, foundation leaks tend to come and go with the weather. They often hide behind finished walls, showing up only after some time has passed.

If you’ve ever had a damp basement, you’re definitely not alone. In fact, more than 95% of homes experience some form of water intrusion at one point or another. The good news? It’s rarely a structural issue. The not-so-good news is that it can still cause costly damage to floors, walls, furniture, and stored belongings—especially in finished basements.

It helps to remember that a house isn’t a boat—if it’s surrounded by water, it’s going to find a way in. Most foundations are damp-proofed (not waterproofed), and that protective layer doesn’t last forever.

What Are the Signs?

Sometimes, the signs of basement moisture are obvious—a puddle on the floor, for example. Other times, they’re much more subtle.

You might notice:

• Discoloured baseboards or drywall

• Rusted nails or metal posts near the floor

• Peeling paint or lifting floor tiles

• Musty odours or visible mold

• Efflorescence (white, powdery residue on concrete)

• A sump pump that runs constantly

Even small clues can point to a bigger issue. And sometimes, there are no visible clues at all, especially in finished basements where problems are hidden behind walls. That’s why home inspectors often use moisture meters or thermal imaging to spot what’s out of sight.

What’s the Solution?

Most of the time, it comes down to one simple rule: keep water away from your foundation.

Your gutters and downspouts are your basement’s best friends. When they’re clogged, missing, or too short, rainwater can collect right against your home—and eventually, it finds its way in. Cleaning your gutters every spring and fall, and making sure downspouts discharge water at least six feet away, can make a world of difference.

Yes, sometimes a $10 downspout extension is all it takes! It sounds too easy, but in my experience, this simple fix solves the majority of basement leaks.

Another key factor is grading—the slope of the ground around your home. The soil should gently slope away from the foundation so rainwater flows outward, not inward. Even a few inches of adjustment over a few feet can help. This is something you can often tackle yourself with a shovel, some topsoil, and a bit of elbow grease.

The Bottom Line

Basement moisture is incredibly common, but it doesn’t have to be overwhelming—or expensive—to fix. With a little awareness and a few preventative steps, you can keep your home dry and your peace of mind intact.

I always remind clients: the goal isn’t to panic, it’s to protect. By understanding where the water comes from and how to redirect it, you’re taking smart steps toward maintaining your biggest investment—your home.