3 Ways Water Gets Into Your Crawl Space (And 2 You're Probably Missing)

Jeff Robinson • October 21, 2026

When a homeowner finally makes the call, something shifts.


We come out and do a thorough inspection. We get under the home and look at everything — and we show you what we're seeing in real time so there are no surprises when we sit back down with you. You'll know exactly what's down there. You'll know exactly what it takes to fix it. And you'll have a clear picture of what your home looks like after the work is done.


No pressure. No scare tactics. Just an honest look at what's happening and a straightforward plan to address it.


Most homeowners tell us the same thing after that first visit.


They wish they hadn't waited as long as they did.

The Moisture You're Missing

Most homeowners think crawl space moisture only comes from one place: the ground. That makes sense. It's dirt. Dirt holds moisture. Case closed, right?


Not quite. There are two more ways water gets in, and most people never think to check them. Here's all three, and what to look for.

1. Ground Moisture (The One Everyone Already Knows)

This is the moisture most people picture first. It's the reason crawl spaces feel damp and smell musty. It's real, and it's common. But it's not the only thing going on under your house. If ground moisture were the whole story, fixing it would solve everything. For a lot of homes, it doesn't.

2. Condensation on Your Ductwork

Here's one most people miss completely. If the air in your crawl space is very humid, that moisture doesn't just sit still. It travels. It moves through the air until it hits something cold, like the metal ductwork your air conditioner runs through.


When humid air touches that cold metal, it turns into water. You'll see it as droplets forming on the bottom of the ductwork. That water drips down, and over time, it adds to the moisture problem in your crawl space.


What to check: Go under your house and look at the bottom of your ductwork. Is it wet? Are there drops of water on it? If so, that's a clue your crawl space has a humidity problem, not just a ground problem.

A crawl space with white plastic vapor barrier covering the ground and wrapping around the support pillars and walls.

3. Water Traveling Through Your Brick

This one surprises almost everyone. Take a look outside at your downspouts. Where does the water go when it rains? If a downspout dumps water right next to your house, that water sits against the brick.


Here's the part most people don't know: brick isn't solid all the way through. It's porous, which means water can actually travel through it. Once that water makes it through the brick, it adds moisture to the air inside your crawl space, which can lead right back to the ductwork problem above.


What to check: Walk around your house and look at every downspout. Is the water being carried away from your foundation, or is it pooling right against the brick?

Put It All Together

Three sources. One result: a damp crawl space that stays damp no matter what you do about the dirt.


Ground moisture — the one everyone already thinks about

Ductwork condensation — check for water droplets under your house

Downspout and brick — check where your downspouts actually drain

If you've only ever dealt with the first one, that might be why the problem keeps coming back.

Book A Free Inspection Now

Your crawl space problems aren't going to fix themselves. But they are fixable. Let's get it done — the right way, permanently.

Or call us directly (217) 863-9559

Not Sure What You're Looking At?

That's what we're here for. A real inspection should check all three of these, not just the ground. If you want a second set of eyes under your house, reach out to My Guys for a straightforward look and an honest answer, no pressure, no scary surprises.

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Mahomet, Illinois Serving all of Central Illinois.

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