If you’ve just encapsulated your crawlspace—or you’re thinking about it—you’ve probably wondered: “Do I still need a sump pump or dehumidifier with encapsulation?”
The short answer? It depends. Let’s break down what each does, why they matter, and how they work together to keep your crawlspace dry and your home healthy.
What Is Crawlspace Encapsulation?
Encapsulation means sealing off your crawl space from moisture by installing a heavy-duty vapor barrier over the ground and walls. It stops damp soil and outside air from sneaking in, drastically reducing moisture and improving air quality.
But does sealing the space mean you can skip other moisture-control tools? Not always.
What Does a Sump Pump Do?
A sump pump is a device installed in a pit (called a sump basin) in your crawlspace or basement. Its job is simple but crucial: pump out any water that accumulates before it causes damage.
If your crawlspace has a history of flooding, standing water, or a high water table, a sump pump is your first line of defense. Encapsulation doesn’t remove existing water or prevent heavy groundwater from pushing in—it just stops moisture and humidity from circulating freely.
What About a Dehumidifier?
A dehumidifier pulls excess moisture from the air, helping keep humidity levels between 40% and 60%. Why does this matter?
Even with encapsulation, some moisture can remain trapped or enter through tiny leaks. High humidity creates a perfect environment for mold, wood rot, and musty smells.
A dehumidifier keeps the air dry and comfortable, protects your home’s structure, and improves indoor air quality.
So, Do You Need Both?
Here’s the bottom line:
- If your crawl space floods or has standing water: You definitely need a sump pump to remove that water. Encapsulation alone can’t handle flooding.
- If your crawl space is damp but not flooded: A dehumidifier paired with encapsulation usually does the trick to control moisture and humidity.
- If you have both flooding and high humidity: Installing both a sump pump and a dehumidifier with encapsulation gives you comprehensive protection.
Every crawlspace is unique. Soil type, climate, home construction, and drainage all play a role in what’s needed.
A professional waterproofing company can evaluate your space, recommend the right combination of encapsulation, sump pumps, and dehumidifiers—and make sure everything works seamlessly together.
Encapsulation is a fantastic step toward a healthier, drier crawlspace. But pairing it with the right equipment ensures you get the full benefit.
If you’re unsure whether you need a sump pump, a dehumidifier, or both, Better Basements & Waterproofing can help. Our experts offer no-pressure assessments and tailor solutions to your home’s specific needs.
Call us to get started on a dry, comfortable crawl space you can count on.