Unfinished basement with exposed beams, a water heater, and plumbing

Wet basements

Basement Waterproofing

If you have water in your basement, it could be a sign of a drainage issue. We inspect your home and recommend the waterproofing solution that fits your needs.

  • Free estimates
  • ECP waterproofing products
  • Drains + sump pumps
1978Family-owned since
48Years in business
ECPEarth Contact Products systems
MO + KSMissouri and eastern Kansas
Water spreading across a basement floorStains are early warnings

The root cause

Where the water comes from

A wet basement is almost always a drainage problem first. Rain and snowmelt soak the soil around your foundation. Clay soil, which is common across the Kansas City area and much of Missouri, holds that water instead of letting it drain away. The water builds up pressure against the walls and under the floor, then finds the easiest way in: the joint where the wall meets the floor, a crack, a window well, or a pipe opening.

Rainwater pouring from a gutter

Outside the house

Gutters, downspouts, and grading

Gutters and downspouts make a big difference. A clogged gutter or a downspout that empties right next to the wall can put hundreds of gallons of water against your foundation in a single storm. Grading that slopes toward the house does the same thing.

  • Clogged gutters
  • Downspouts that empty next to the wall
  • Grading that slopes toward the house

Know the warning signs

Common signs

Some of these show up outside the house before you ever see water inside.

Gutter and downspout problems

Clogged gutters and improper downspout discharge.

Water stains high on walls

Stains high on the foundation walls.

Growing cracks

Foundation cracks larger than 1/8 inch that continue to grow.

White mineral deposits

White, chalky deposits on the walls.

Spalling masonry

Spalling deeper than 1/2 inch.

Mildew and mold

Linked to basement or crawlspace moisture.

Migrating mulch and soil

A sign of poor drainage around the house.

Mulch that washes across the lawn after a storm, or soil that has pulled away from the foundation, tells you where water is going. Inside, white chalky deposits on the walls are minerals left behind as water seeps through the concrete and evaporates.

Finished carpeted basement living space

Why it matters

Left alone, that water does more than ruin carpet and storage boxes.

It feeds mildew and mold, damages masonry, and adds pressure that can contribute to cracked and bowing foundation walls.

Our methods

Our waterproofing systems

Waterproofing products are made by Earth Contact Products. We recommend what fits your house, not a one size fits all package.

Cutaway diagram of an interior drain system with perforated pipe along the footing and a sump pit in the basement floor
Interior drain system: perforated pipe along the footing carries water to a sump pit.
No digging up the yard

Interior waterproofing

Perforated drain pipe is installed inside the footing perimeter to collect water that comes through the walls or up at the floor joint and carry it to a sump pit, without digging up the yard.

Excavated trench at a suburban construction site
Stops water outside

Exterior waterproofing

The foundation is excavated and protected on the outside with a membrane, drainage board, and perforated drain pipe, so water is handled before it reaches the wall.

Unfinished basement with concrete block walls and exposed joists
Moves water out

Sump pumps and pits

Heavy-duty sump pumps and pits move collected water out and away from the house.

Perforated drain pipe laid in a gravel trench
Handles yard water

French drains and surface drainage

French drain systems, surface drainage, and water collection systems deal with water in the yard and at the downspouts, which is often where the problem starts.

Step by step

How a waterproofing job works

From the first look to the walkthrough, here is what to expect.

  1. 1

    Free estimate and inspection

    We look at where the water shows up inside, then walk the outside to check gutters, downspouts, grading, and the condition of the walls.

  2. 2

    A plan that matches the problem

    Sometimes the fix is surface drainage. Sometimes it is an interior drain and sump pump, or exterior waterproofing. We tell you which one and why.

  3. 3

    Installation

    Our crew installs the system and makes sure water has a clear path out and away from the foundation.

  4. 4

    Cleanup and walkthrough

    We clean up the work area and show you how the system works, including the sump pump.

Questions

Basement waterproofing FAQ

Straight answers to the questions we hear most.

Ask us directly

Is interior or exterior waterproofing better?

Both work. Interior systems collect water at the footing and send it to a sump pit without excavating the yard. Exterior systems keep water off the wall from the outside. The right choice depends on your house, your lot, and where the water is coming in.

Will cleaning my gutters fix a wet basement?

Sometimes it helps a lot. Clogged gutters and downspouts that discharge next to the foundation are common causes. If water is also coming through cracks or the floor joint, you may need a drain system too.

What are the white deposits on my basement walls?

Those are mineral deposits left behind when water moves through concrete or masonry and evaporates. They mean moisture is getting through the wall.

Can water problems damage my foundation?

Yes. Saturated soil adds pressure against basement walls and can contribute to cracking and bowing. If you see horizontal cracks or a wall leaning in, see our foundation repair page.

I have a crawlspace, not a basement. Can you help?

Water and settlement

Related services and areas

Water and settlement often show up together. Check out foundation repair for cracked or bowing walls, crawlspace encapsulation for damp crawlspaces, and polyjacking for sunken slabs and sidewalks that send water back toward the house.

Free estimates are available for homes and businesses across the Kansas City, MO and KS areas, including Overland Park, Raytown, Columbia, and surrounding communities. See the full list on our service areas page.

Free estimates

Tired of a wet basement?

Call for a free estimate. Kansas customers can reach us at (913) 383-1800.