How to Get Rid of Mold in Your Crawl Space

Crawl Space Mold can damage your home’s structure, lower your indoor air quality, and cause health issues for you and your family. Learn how to get rid of mold in your crawl space.

What is Mold or Moisture in Your Crawl Space?

Mold is a type of fungus that grows on organic materials, such as wood, paper, fabric, or soil. It reproduces by releasing tiny spores into the air, which can travel to other areas and start new colonies. Mold needs moisture, oxygen, and a food source to grow, so it thrives in damp, dark, and poorly ventilated spaces.

Crawl space mold can come from various sources, such as groundwater seepage, plumbing leaks, condensation, or poor drainage. When moisture accumulates in your crawl space, it creates the perfect environment for mold to grow. Mold can also attract pests, such as termites, rodents, or insects, which can further damage your home.

What Causes Crawl Space Mold?

There are many factors that can contribute to crawl space mold growth, but the main cause is excess moisture. Some of the common sources of moisture in your crawl space are:

Sources of Mold & Moisture in Your Crawl Space

To prevent and remove mold from your crawl space, you need to identify and eliminate the sources of moisture that are causing it. Here are some of the most common sources of mold and moisture in your crawl space and how to fix them:

Groundwater Seepage

To prevent groundwater from entering your crawl space, you need to seal any cracks or gaps in your foundation walls with hydraulic cement or epoxy. You also need to install a vapor barrier on the dirt floor of your crawl space to prevent moisture from rising up from the soil. A vapor barrier is a thick plastic sheet that covers the entire floor and extends up the walls by at least 6 inches. It should be overlapped and sealed at the seams with tape or caulk.

Plumbing Leaks

To prevent plumbing leaks from causing mold growth in your crawl space, you need to inspect all the pipes and fixtures that run through or near your crawl space regularly and fix any leaks as soon as possible. You can use plumber’s tape, epoxy putty, or pipe clamps to seal minor leaks temporarily until you can replace the damaged sections. You should also insulate any exposed pipes to prevent condensation from forming on them.


To prevent condensation from forming in your crawl space, you need to improve the ventilation and insulation of your crawl space. Ventilation allows fresh air to circulate through your crawl space and reduce humidity levels. You should have at least one vent for every 150 square feet of crawl space area and make sure they are not blocked by debris or vegetation. Insulation helps keep the temperature of your crawl space consistent with the outside air and prevents heat loss or gain through the floor above. You should insulate the ceiling of your crawl space with fiberglass batts or rigid foam boards and seal any gaps or holes with spray foam or caulk.

Poor Drainage

To prevent poor drainage from causing water to pool around your foundation and seep into your crawl space, you need to maintain your gutters and downspouts and install a sump pump. Gutters and downspouts should be cleaned and repaired regularly and extended at least 10 feet away from your home. A sump pump is a device that collects water from your crawl space and pumps it out to a safe location. You should install a sump pump in the lowest point of your crawl space and connect it to a battery backup system in case of power outage.

Symptoms of Crawl Space Mold Problems

Mold in your crawl space can cause various symptoms that affect your home and your health. Some of the common symptoms of crawl space mold problems are:

How to Prevent and Remove Crawl Space Mold

Step 1: Identify and eliminate the sources of moisture in your crawl space, as explained above.

Step 2: Dry out your crawl space using fans, dehumidifiers, or heaters. You should aim to keep the relative humidity level below 50% to discourage mold growth. You can use a hygrometer to measure the humidity level in your crawl space.

Step 3: Remove any moldy or damaged materials from your crawl space, such as insulation, cardboard boxes, or wood scraps. You should wear protective gear, such as gloves, goggles, mask, and coveralls, when handling moldy materials and dispose of them in sealed plastic bags.

Step 4: Clean the affected surfaces with a solution of bleach and water (1 cup of bleach per gallon of water) or a commercial mold remover. You should scrub the surfaces with a stiff brush or a sponge and rinse them with clean water. You should also disinfect any tools or equipment that came in contact with mold.

Step 5: Seal any gaps or cracks in your crawl space walls or floor with caulk or spray foam to prevent moisture from entering again. You should also apply a waterproof coating or paint on the walls to create a moisture barrier.

Step 6: Monitor your crawl space regularly for any signs of moisture or mold recurrence and take preventive measures as needed.

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Contact Us For Professional Crawl Space Repair Services In Charlotte and the Surrounding Areas

As a reputable foundation repair company serving Charlotte, NC, and surrounding areas, RhinoLift is dedicated to providing top-notch services to homeowners facing foundation damage concerns. Our team of skilled contractors understands the importance of ensuring the safety and well-being of our clients and the longevity of their homes. We offer complimentary inspections and detailed service quotes to Charlotte homeowners, allowing us to accurately assess the extent of the foundation damage and provide an effective repair plan. You can trust us to implement the best strategy tailored to your specific needs, whether it’s addressing bowing walls, tilting walls, or other foundation issues.

Contact our RhinoLift Foundation & Crawl Space Repair team by calling 888-758-3735 to schedule an appointment. You can also click the button below to fill out our online contact form for a free crawl space inspection.