Crawl Space Moisture Isn't Always From the Ground - Here's What Else to Check

Jeff Robinson • October 14, 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.

It's Not Just the Dirt Under Your House

If your crawl space floor looks dry, you might think you're in the clear. But moisture doesn't only come from the ground. It can come from the air around your ductwork. It can come from a downspout sitting too close to your wall. Both of these can cause real problems, even if the floor underneath looks perfectly fine.


Here's what to check.

Check Your Ductwork for Water

Take a flashlight and look at the bottom of your ductwork. If you see water droplets, that's a sign your crawl space air is too humid.


Here's why it happens. Your air conditioner cools the metal ductwork down. When humid air hits that cold metal, the moisture turns into water. That water drips off the bottom and ends up in your crawl space.


This isn't ground moisture. It's moisture that was already in the air, showing up somewhere you can actually see it.

Check Your Downspouts

Walk around the outside of your house and look at where your downspouts let out. If one is dumping water right next to your foundation wall, that's a problem.


Here's why. Many homes are built with brick, and brick is porous. That means water can pass through it. If a downspout lets water sit against the brick, that water can soak through the wall and into your crawl space.


You won't always see a puddle. But the moisture still gets in.

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

Your Quick Checklist

  • Look at the bottom of your ductwork for water droplets
  • Walk your home's exterior and check where each downspout drains
  • Make sure no downspout lets water sit directly against a brick wall
  • Don't assume a dry floor means a dry crawl space

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. If you check these spots and you're not sure what you're seeing, or you want someone to take a closer look, reach out to My Guys. We'll walk through your crawl space with you and show you exactly what's going on, so you understand it before any decision gets made.

Based in

Mahomet, Illinois Serving all of Central Illinois.

Business Hours

Mon Fri - 8am to 5pm

Sat Sun - Closed

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