How to Fix a Leaking Crawl Space
May 26, 2025
A leaking crawl space might seem like a minor inconvenience—but left untreated, it can lead to mold growth, wood rot, high energy bills, and even structural damage. If you've noticed moisture under your home, you're not alone. Crawl space water issues are common in the Kansas City Metro due to heavy rain, poor drainage, and shifting soil.
The good news? Fixing a leaking crawl space is possible—and essential for protecting your home. At Foundation King, we specialize in crawl space encapsulation and waterproofing, helping homeowners restore peace of mind and property value.
Here’s everything you need to know about how to fix a leaking crawl space.
Signs You Have a Leaking Crawl Space
Most crawl space problems start small—but the signs are easy to spot if you know what to look for:
- Musty or damp smells inside your home
- Standing water or puddles beneath the house
- Mold growth on wood framing or insulation
- Wood rot, especially on joists or subflooring
- Sagging floors or uneven hardwood/tile
- High humidity or allergy symptoms indoors
- Increased energy bills due to moisture impact on HVAC
If you've noticed any of these, it's time to take action.
steps to Fix a Leaking Crawl Space
1. Inspect and Identify the Source
Start with a professional inspection. At Foundation King, we look for:
- Water entry points
- Structural concerns
- Mold or microbial growth
- Poor drainage or ventilation
Identifying the source is critical for an effective, permanent fix.
2. Improve Exterior Drainage
Before sealing up the crawl space, address the grading and drainage around your home:
- Slope soil away from the foundation
- Install gutter extensions to carry water away
- Consider adding a French drain system to divert runoff
This prevents rainwater from pooling around your home’s perimeter.
3. Seal Foundation Cracks
Cracks in the foundation or crawl space walls can be sealed using:
- Polyurethane injections
- Concrete or masonry repair products
This stops water from seeping in through weak points.
4. Install a Drainage System
If your crawl space experiences standing water, a drainage solution may be necessary:
- Interior perimeter drains to collect and channel water
- A sump pump system to automatically remove excess water
Proper drainage ensures water doesn’t build up under your home again.
5. Crawl Space Encapsulation
This is the most effective long-term fix for a leaking crawl space. Here’s how it works:
- A thick vapor barrier (usually 12–20 mil) is installed across the floor and walls
- All vents, gaps, and penetrations are sealed
- Insulation is added as needed
- A dehumidifier may be installed to control air moisture
- The crawl space is completely sealed and conditioned
The result? A dry, clean, and protected space that supports the health of your entire home.
Why Crawl Space Encapsulation is Worth It
Still wondering if it's worth the investment? Here’s why homeowners across Kansas City choose encapsulation:
- Stops moisture damage and wood rot
- Improves indoor air quality by reducing allergens and mold
- Lowers energy bills by preventing HVAC overwork
- Protects your foundation and structure
- Increases your home’s resale value and marketability
At Foundation King, we understand the unique moisture challenges of the Kansas City area. Our crawl space services are designed specifically for local soil and climate conditions, giving you results that last.
When you work with us, you get:
- A free inspection and honest quote
- Licensed and insured professionals with years of experience
- A commitment to clean, respectful, and timely service
- Warrantied work backed by a trusted local company
We proudly serve Overland Park, Lee’s Summit, Olathe, Liberty, and the entire Kansas City Metro.
Fix Your Leaky Crawl Space – Schedule a Free Inspection Today
A leaking crawl space won’t fix itself—and the longer you wait, the worse the damage becomes.
Let Foundation King help. We’ll inspect your crawl space, explain your options, and recommend the best solution for your home—with no pressure and no guesswork.
Contact us today! Keep your home safe, dry, and strong from the ground up.
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