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How to Prevent Mold in Your Crawl Space

April 25th, 2025

4 min read

By Jorge Cardenas

A crawl space with moisture and condensation.

Are you noticing a musty smell in your home and not sure why? Have your family members started experiencing allergic reactions out of the blue? It might just be the hidden mold in your crawl space! While this situation can feel worrying, the good news is that you can take steps to prevent it altogether.

At Restore-It, we completely understand how you feel—many of our customers have been in the same situation. As your trusted experts in encapsulation and mold remediation, we're here to walk you through the steps to prevent mold in your crawl space effectively.

In this article, we'll explore the usual culprits behind crawl space dampness, share some handy solutions, and help you find the best strategies to keep your crawl space dry and mold-free. Together, we'll discover how to make your home a more comfortable space for you and your loved ones.

Mold and Common Moisture Sources

Mold loves moisture, which is why it's so important to keep your crawl space dry to prevent its growth. Mold can't survive without water, but you might wonder where all this moisture comes from. Let's explore some common sources together:

  • Leaky Pipes: Even small leaks can create a damp environment.
  • Groundwater Seepage: Water can seep through foundation walls and floors.
  • Condensation: Warm, humid air can condense on cool surfaces.
  • Poor Ventilation: Trapped moisture has nowhere to escape.
  • Rainwater Runoff: Improper drainage can direct water toward your foundation.

Practical Steps for a Dry Crawl Space

Now that we know the culprits, let's look at the solutions.

Fix Leaky Pipes

Water leaking is the number one cause of mold growth in homes. In fact, the United States Environmental Protection Agency (EPA) recommends fixing plumbing leaks as the first step in mold cleanup. Mold can grow in the next 24 to 48 hours after finding the right conditions, so it is important to address plumbing problems quickly to prevent mold growth.

Improve the Draining

When protecting your home, your gutters, downspouts, and gutter extenders are like trusty allies, helping to guide rainwater away from your foundation. Just remember, they work best when installed correctly! Check the positioning of your gutters and downspouts, and make sure rainwater flows far away from your foundation, keeping it dry under your home.

It's a good idea to check your gutters before the next storm rolls in! Make sure they're clear of any leaves or debris, as blockages can lead to overflow seeping into the soil around your foundation. Remember, the concrete in your foundation walls is porous, which means water can pass through like a sponge. This creates a damp environment in your crawl space.

Seal Foundation Cracks

As we mentioned earlier, keeping water away from your foundations is important to prevent moisture in your crawl space. To help ensure this, you can take the extra step to fill in any cracks in your foundation walls and floors.

You can fix those concrete foundation cracks using a sealant like epoxy injection. It's actually one of the most effective methods out there! If you're dealing with smaller cracks, a vinyl concrete patching compound or hydraulic cement can be great alternatives, too. Just remember to thoroughly clean and prepare the surface before applying any sealant—this will help ensure the best results!

Consider Encapsulation

crawl space encapsulation 5Encapsulation provides a wealth of benefits for your crawl space.

Crawl space encapsulation is a project that can greatly improve the conditions of your crawl spaces. Amongst their numerous benefits, it can stop any future mold from growing underneath your home. Let's take a look into it:

  • Cleanup: Before encapsulation work can begin, the area is cleaned, mold growth is treated, and the soil and walls are prepared for the moisture barrier that will cover them.
  • Complete Sealing: For encapsulation to be effective, all vents in the crawlspace must be sealed, leaving only an entry point closed unless the homeowner needs access to the space.
  • Vapor Barrier Installation: This thick plastic cover is lined against the ground and walls, preventing moisture from rising.
  • Enhanced Dehumidification: A dehumidifier is installed, removing excess moisture from the air, sucking up all the dampness and redirecting it outside.
  • More Control and Lights: As part of the process, lights are installed to facilitate access to the area. Other conveniences, like a hygrometer (that measures moisture) and remote control, allow homeowners to check the crawl space's condition without going down there.
  • Sump-Pump Installation (optional): A sump pump with french drains can be installed in some cases, particularly in flood-prone areas. This system redirects excess water to a pit that catches the runoff and redirects it outside through a pump.

Why You Should Leave Encapsulation to the Pros

While this project, as most home improvement projects, could technically be done by any dedicated homeowner, we recommend leaving it to the professionals. These are some of the main reasons:

  • Safety: Crawl spaces are small and dark, and you could easily get trapped if you don't know how to navigate them.
  • Proper Material Selection: Professionals know how to pick the best vapor barrier and insulation materials for your needs.
  • Airtight Sealing: They have the tools and expertise to create a genuinely sealed environment, preventing moisture intrusion.
  • Accurate Measurements and Customization: Professionals ensure precise fit and customization, maximizing the effectiveness of the encapsulation.
  • Avoidance of Costly Mistakes: Incorrect installation can lead to more problems, costing more in the long run.
  • Long-Term Protection: Professional encapsulation provides a durable and reliable solution, safeguarding your home for years to come.

Regular Inspections

Regular inspections are crucial for identifying and addressing potential problems before they escalate.

  • Check for Leaks: Inspect pipes and plumbing fixtures for leaks.
  • Monitor Moisture Levels: Use a moisture meter to check for dampness.
  • Look for Signs of Mold: Inspect walls, floors, and other surfaces for mold growth.
  • Address Issues Promptly: Take immediate action to address any problems you find.

Keeping mold out of your crawl space is about managing moisture in that area. If dampness and mold finding their way into your home worries you, you're definitely not alone. At Restore-It, we genuinely get how unsettling this can be, and we're here to equip you with the knowledge you need to foster a dry, healthy environment.

Understanding the importance of addressing plumbing issues, ensuring proper drainage, sealing cracks, and encapsulation empowers you to take charge of your crawl space! Contact us for professional crawl space encapsulation, as it offers the best and most enduring protection against mold and moisture. As your trusted experts in crawl space solutions, we are dedicated to working alongside you to cultivate a healthy, mold-free environment.