Wet Crawl Space After Rain? 6 Methods to Fix It!

August 25, 2023

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wet crawl space after rain

Have you ever noticed a musty smell in your home after a heavy rain? Or perhaps you've seen puddles forming in your crawl space? A wet crawl space is a common problem for many homeowners, especially after periods of heavy rainfall. 

What can be done about a wet crawl space after rain? To prevent moisture damage, identify and seal the source of water infiltration, improve grading and drainage, manage exposed soil, and control the crawl space humidity level.

Water accumulation can cause mold growth, rotting wood, and attract pests. Luckily, there are several methods you can try to fix a wet crawl space and prevent future moisture issues.

1. Identify the Source of the Water

Before attempting to fix a wet crawl space, it's important to figure out where the water is coming from. Is it entering through the outside vents? Seeping in through cracks in the foundation? Leaking from plumbing pipes? Or is it rising up from the ground due to poor drainage? Taking the time to correctly diagnose the source of moisture is key to finding the right solution. You may need to wait until after heavy rain to actually see where water is infiltrating the area.

leaky pipes

2. Wet Crawl Space After Rain? Improve Grading and Drainage

If water is entering the crawl space from the surrounding soil, improving drainage around the foundation is critical. Make sure the ground slopes away from your home's foundation at a rate of at least 1 inch per foot. Install downspout extensions to move roof runoff away from the house.

You may also consider installing French drains along the perimeter of the crawl space to collect water and move it away from your home. Proper grading is an essential step in keeping a crawl space dry.

downspout on side of home

3. Waterproof the Foundation

Sometimes, moisture enters through cracks or openings in the crawl space walls or foundation. In this case, you'll need to seal these gaps. Waterproofing paints or sealants designed for concrete and masonry can help fill small holes and prevent water intrusion. For larger cracks or damage, you may need to apply waterproofing membranes or wraps around foundation walls. This creates a moisture barrier to stop groundwater from seeping in.

wet crawl space after rain

4. Cover Exposed Soil

Exposed dirt floors in a crawl space can allow water to evaporate and enter the structure. An easy fix is to lay down sheets of plastic over any exposed earth. This creates a vapor barrier that blocks moisture from moving up into the floor joists and floors above. For the best results, the plastic should overlap by 12 inches and be sealed with waterproof tape.

crawl space encapsulation waterproofing method

5. Manage Humidity Levels

Excess moisture in the air of a crawl space can condense on floors and walls, adding to the dampness. Using a dehumidifier can help maintain humidity between 30-50%. Be sure to drain and clean the dehumidifier as directed. You can also increase air circulation in the crawl space with fans or by allowing more ventilation. Reducing humidity helps control mold growth and prevent wood rot due to excess moisture.


6. Hire a Professional Waterproofing Service

For extensive water damage or drainage issues it may require the expertise of a professional waterproofing company. Many companies offer full-service solutions to prevent wet crawl spaces. This may involve installing drainage pipes, pumping systems, moisture barriers, and vapor retarders throughout the space. Though hiring a contractor costs more upfront, it can prevent costly repairs down the road.

professional waterproofer adding sealant to foundation

In Conclusion

Dealing with a chronically wet, soggy crawl space can become a headache. But with some detective work and the right waterproofing methods, you can stop moisture problems before they create serious issues. Pay attention after heavy storms to spot any new leaks right away. And don't be afraid to call the pros if you need help getting your damp crawl space back to dry land! With the right approach, you'll have one less thing to worry about after a stretch of wet weather.

About Bloomington Foundation Repair Experts

Bloomington Foundation Repair Experts offers over 20 years of on-the-job experience. From pier & beam to concrete slab foundation repair, our customers can count on us for a job well done. To schedule a FREE inspection and estimate, please call (309) 220-3907.


Is it normal to have water in crawl space after rain?

Having some water in the crawl space after heavy rains is fairly common, but standing water or puddles indicate a problem with drainage or the foundation that needs to be addressed. Persistent moisture in the crawl space after rain can lead to mold, wood rot, and other issues, so it's important to find and repair the source of any leaks.

How do you dry out a wet crawl space?

The key to drying out a wet crawl space is to first address the source of moisture by repairing leaks, improving drainage, and sealing vents. Once the source is handled, running dehumidifiers, covering exposed dirt with plastic sheeting, and increasing air circulation with fans will help remove excess moisture and prevent future water accumulation.

Can heavy rain cause water in crawl space?

Yes, heavy rains can definitely cause water to accumulate in a crawl space due to saturation of the surrounding soil and overflow of gutters or drainage systems around the foundation. If large amounts of rainwater are entering the crawl space, it likely indicates an issue with improper grading, clogged downspouts, or cracks and gaps in the foundation that should be addressed to prevent moisture damage.

How much water is acceptable in a crawl space?

Ideally, there should be no standing water or puddles accumulating in a crawl space, as this can lead to mold growth and wood rot over time. Minor seepage that evaporates within 48 hours may be tolerable. Still, persistent moisture or water covering over 50 square feet warrants investigation and repair to control excess water in the crawl space.

How do I stop water pooling under my house?

To stop water from pooling under your house, you'll need to improve drainage around the foundation by regrading the soil to slope away from the house and installing downspout extensions to direct roof runoff away from the structure. You should also check for leaks in the foundation or vents and seal any cracks or openings with waterproof sealants to prevent groundwater from seeping into the crawl space area under your home.

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