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What Is the Best Way to Waterproof a Basement Yourself?

Last updated October 26, 2026

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The short answer

Start Outside

Waterproofing a basement begins outdoors. Check that gutters and downspouts direct rainwater at least 6 to 10 feet away from the foundation. If downspouts are short, attach extensions. Also look at the soil grade around the house. The ground should slope away from the walls so surface water runs off, not toward the foundation.

If you have window wells, make sure they have covers and that the drains inside are clear. For deeper issues, such as a high water table or persistent flooding, exterior excavation and drainage may be needed. That is a bigger job, often best left to local water damage pros who can assess the situation and recommend the right fix.

  • Extend downspouts at least 6 feet from the house
  • Regrade soil so it slopes away from the foundation
  • Clean and cover window wells
  • Seal gaps around pipes and utility lines entering the basement
  • Check that the condensate pump discharge line is directed away from the house

Seal Interior Cracks

Inside the basement, inspect walls and floors for cracks. Small hairline cracks can be sealed with a masonry waterproofing paint or a concrete crack filler. For larger cracks or where water is actively seeping, use hydraulic cement. It expands as it sets, filling the gap and stopping water flow. Apply it in layers, pressing firmly into the crack.

Before sealing, clean the area and remove loose material. Let the surface dry if possible. If you see efflorescence, a white powdery residue, that is a sign of moisture moving through the concrete. Sealing the crack from the inside is a temporary fix; the real problem is outside. For ongoing seepage, a more permanent solution may be needed.

Apply a Waterproof Coating

After sealing cracks, you can apply a waterproof coating to the interior walls. Products like masonry waterproofing paint or a cement-based coating are available at hardware stores. These create a barrier that resists moisture. Clean the walls first, and apply the coating in two coats, following the manufacturer's instructions. This works best on walls that are not under constant water pressure.

For floors, consider a concrete sealer or epoxy paint. These help reduce dust and make the floor easier to clean. However, no interior coating stops water that is under pressure from outside. If water is pooling on the floor or seeping through the wall, the source must be addressed first. Otherwise, the coating will peel or bubble.

Control Humidity Inside

Even a dry basement can feel damp. High humidity leads to condensation on cool pipes and walls, which can cause mold and musty odors. A dehumidifier is a practical tool. Set it to keep relative humidity around 50 percent. Empty the reservoir regularly or connect a hose to a floor drain. Also, make sure vents and air registers are not blocked.

In humid months, run the dehumidifier consistently. In coastal areas with high humidity, dehumidifying is often a year-round task. Keep basement air moving with a fan if needed. This helps prevent mold growth on stored items and keeps the space feeling drier. A hygrometer can help you monitor the humidity level.

Know When to Call the Pros

DIY waterproofing works for minor dampness and small cracks. But if you see standing water, large cracks, or signs of foundation movement, the problem is more serious. A flooded basement from a heavy rain or a burst pipe needs professional cleanup to remove water, dry the space, and prevent mold. Attempting to waterproof over a wet or contaminated area is not effective.

For major water issues, local water damage pros can inspect the basement, find the source, and recommend a solution. They may use interior drain systems, exterior excavation, or other methods. If you notice sewage or contaminated water, do not handle it yourself. Call a professional for sewage cleanup, and avoid contact with the water.

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Frequently asked questions

Can I waterproof my basement from the inside only?

Interior sealing and coatings can reduce dampness, but they do not stop water under hydrostatic pressure. For a truly dry basement, you must address drainage outside and manage groundwater. Interior methods are a good first step, but for persistent leaks, the source is outside.

How long does basement waterproofing last?

It depends on the product, the condition of your walls, and the amount of water pressure. A quality masonry coating may last several years, but cracks can reopen as the house settles. Regular inspection and maintenance are key. If the exterior drainage is poor, even the best interior seal will fail.

Is waterproofing paint enough to stop a wet basement?

No. Waterproofing paint helps with minor dampness and condensation, but it will not stop water that is seeping through cracks or under pressure. For that, you need to fix the grading, extend downspouts, and seal cracks. If water is actively coming in, you need a more robust solution, possibly from a professional.

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