Why You Need A Crawl Space Drainage System

Why You Need A Crawl Space Drainage System

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Why You Need A Crawl Space Drainage System

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Table of Contents

A crawl space drainage system protects your home’s structural integrity and your health. This article will cover what a crawl space is, how crawl spaces get wet, how crawl space drainage systems work, crawl space encapsulation, and other ways to keep your crawl space dry.

What Is a Crawl Space?

A crawl space foundation lifts a house approximately 1.5-3 feet off the ground and creates a space under the house that’s just big enough to crawl around in.

Crawl space foundations have been popular for decades, and when they’re waterproofed and encapsulated (more on this below), they can be used to store things like holiday decorations, tools, canned food, etc.

Why Do Crawl Spaces Get Wet?

Crawl spaces get wet for various reasons, including the following:

  • Crawl spaces have uncovered dirt floors. If the soil gets wet, the crawl space will be wet.
  • Crawl spaces are vented. This allows warm, humid air to enter and condense on cooler surfaces, encouraging mold growth on wooden structures in the crawl space.
  • Crawl spaces sometimes have leaking drainage pipes in them.

For more information see,  Crawl Space Waterproofing: Why You Might Need It.

Why You Don’t Want a Wet Crawl Space?

A wet crawl space encourages mold growth. You don’t want mold growth in your crawl space because some air from the crawl space ends up in your home’s living area. Breathing mold spores can cause allergies and other respiratory issues – some potentially serious – for anyone living in the home. Mold will also eat away at the beams and joists in the crawl space, affecting your home’s structural integrity.

A wet crawl space also attracts pests like wood-eating termites, snakes, and rodents that leave behind toxic droppings.

If the above weren’t bad enough, if the soil under your home is prone to erosion, a wet crawl space will slowly destabilize the piers holding up the home by washing away the soil.

Bottom line: If you want a healthy home, the crawl space should be kept clean and dry. Fortunately, there’s a way to do that.

benefits of waterproofing a crawl space

What Is a Crawl Space Drainage System?

A crawl space drainage system ensures that the soil around the home’s foundation and crawl space doesn’t get saturated with water that can’t drain off. When the soil around the crawl space is dry, your chance of having a wet crawl space is significantly reduced. So, getting groundwater under control via good drainage is the key to effective waterproofing. In fact, a crawl space drainage system along with a sump pit and sump pump can even keep your crawl space dry during storms.

Crawl space drainage system installation process

  • Any debris is removed from the crawl space.
  • A shallow trench is dug around the inside perimeter of the crawl space, along with a sump pit.
  • The trench is lined with gravel.
  • A perforated drainage pipe is placed in the trench and covered with more gravel.
  • The excavated dirt is replaced.

Excess water in the soil will go into the drainage pipe and be directed to the sump pit. When the sump pit fills with water, the pump kicks in and expels the water away from the foundation.

encapsulated crawl space in Overland Park, KS

A Crawl Space Drainage System Plus Crawl Space Encapsulation 

After installing a crawl space drainage system, homeowners often encapsulate their crawl space as well. Crawl space encapsulation involves covering the floor and walls of the crawl space with a thick vapor barrier. This seals off the crawl space from moisture in the dirt floor and from any moisture that finds its way through the foundation wall.

If you want to kick it up a notch, you can add a dehumidifier as well for a crawl space that’s both clean and extra dry.

Other Ways to Prevent Moisture in a Crawl Space

If you can’t afford a crawl space drainage system right now, that doesn’t mean you’re totally out of luck. There are other things you can do that will help keep groundwater around your home’s foundation under control. These include:

  • Regrade your yard, if necessary – The yard around your home should slope away from the foundation. You don’t want water draining toward the foundation.
  • Don’t forget to clean your gutters – Clogged gutters will cause runoff to go where you don’t want it. That is, over the side of your home, where it will soak into the soil around the foundation.
  • If your downspouts are too short, install extensions – Downspouts should channel water at least 10 feet away from the foundation before releasing it. Downspout extensions are inexpensive and easy to install.
  • Consider underground downspouts with pop-up emitters – Another option is to channel runoff from the gutters into underground downspouts with pop-up emitters situated 10 feet or so from your foundation. When the pop-up emitter basin fills with water, it pops up and releases it away from the foundation.
  • Don’t plant vegetation around the foundation – You want to avoid any reason to dump water in the soil around the foundation.

If you think your home might need a crawl space drainage system and are in our Kansas City, MO service area, contact us today for an estimate.



Don Derry, Jr. is the owner of KC Waterproofing & Foundation Repair. Don became an entrepreneur at the age of 18 and has operated a successful business in Kansas City for nearly 40 years. His vision for the company has always been to help property owners protect their investment and valuables from foundation, structural and water control problems. KC Waterproofing & Foundation Repair continues to lead the way in cutting edge technologies. Structural piering, wall anchoring, foundation underpinning, interior and exterior drainage control, new construction waterproofing and poly injections for slab stabilization are among the top services provided.