What Is a Crawl Space Drainage System?
A crawl space drainage system collects water that gets in beneath your home and channels it to a sump pump. A perforated drainage pipe is set into a gravel-filled trench along the interior perimeter, with filter fabric helping keep soil and debris out.
From that point, the crawl space sump pump removes the collected water and discharges it away from the foundation. Drainage can also be paired with crawl space encapsulation to help control ground moisture and humid air.
Symptoms
Warning Signs Your Crawl Space Needs Drainage
Standing water, muddy or constantly wet soil, water stains on foundation walls and white, chalky efflorescence can all signal a drainage problem. It’s worth noting when the water appears, too. A crawl space that keeps getting wet after heavy rain or never fully dries between storms may need a better system for collecting and removing incoming water. You might also notice musty odors, damp or fallen insulation, elevated indoor humidity, pest activity or floors that feel soft, springy or uneven. These symptoms can point to an ongoing water problem below your home.
Our Crawl Space Drainage Solutions
For standing water and soil that never dries out after rain
Interior Perimeter Drain (Crawl Space French Drain)
An interior perimeter drain collects water where it commonly enters the crawl space—along the foundation walls and footing. Installed below the crawl space floor, the drain creates a controlled path for incoming water to reach the sump basin rather than spreading across the soil or pooling beneath your home.
For water that collects with nowhere to go
Crawl Space Sump Pump
A crawl space sump pump gives collected water somewhere to go. Water from the perimeter drainage system drains into a sump basin, where the pump automatically removes it and sends it through a discharge line away from the foundation. Together, the drain and sump pump create a continuous path for managing water beneath your home.
For damp, uneven dirt crawl space floors
Drainage Matting
Drainage matting creates a durable layer over dirt or uneven crawl space floors while providing space for water to move beneath the surface. Its dimpled design helps move water toward the perimeter drainage system instead of allowing it to become trapped beneath a vapor barrier. It also gives you a more uniform surface for installing additional moisture protection.
For moisture problems that drainage alone can't solve
Vapor Barrier & Crawl Space Encapsulation
Drainage addresses liquid water, but it doesn’t stop moisture from evaporating out of exposed soil or humid outside air from entering the crawl space. A vapor barrier or full crawl space encapsulation system brings that next layer of protection by separating the crawl space from moisture sources that drainage alone isn’t designed to control.
How It Works
How Blackburn Foundation Repair Installs a Crawl Space Drainage System
Interior vs. Exterior Crawl Space Drainage: What Does Your Home Need?
Interior crawl space drainage is installed along the inside perimeter to collect water that reaches the foundation and direct it to a sump pump. It’s often a good fit for existing homes because installation doesn’t require excavating around the exterior. Exterior drainage stops water before it reaches the foundation but usually requires excavation. Depending on the source, improving gutter drainage, grading or downspout discharge may also be necessary. Some homes benefit from a combination of interior and exterior water management.
What To Expect
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