Popular Basement Waterproofing Methods

No two basements are exactly alike. That’s why waterproofing needs to be tailored to your foundation, your home’s age, and what kind of water issues you’re dealing with. Here are five of the most common basement waterproofing methods we use to help homeowners get back to a dry basement.

1. Exterior Basement Waterproofing

If water is seeping in from the outside ground, exterior waterproofing is a smart investment. This method stops moisture before it even has a chance to reach your foundation walls.

What it involves:

• Digging around the outside of your basement
• Sealing your foundation with a waterproof coating or membrane
• Installing a drainage system to redirect water away from the house

This is especially useful if you’ve had repeated flooding or water infiltration during storms. It’s a more extensive process, but when done right, it can last for decades.

2. Interior Basement Waterproofing

For wet basements that don’t involve flooding but do have leaks, interior waterproofing may be all you need. It’s less invasive than exterior work and can help prevent future problems.

Here’s how it works:

• Apply interior sealants to your basement walls and cracks
• Use waterproof membranes to cover walls or concrete surfaces
• Improve airflow to reduce humid air and condensation

This method doesn’t stop water from entering the exterior wall, but it helps control and redirect it so it doesn’t damage your property.

3. Sump Pump Installation

Ask anyone who’s had a flooded basement—a good sump pump can save you thousands. If water tends to collect at your home’s lowest point, a sump pump helps by pumping it out and away from your foundation.

Why it matters:

• Removes excess rainwater after strong storms
• Works with an interior drainage system for added protection
• Helps manage hydrostatic pressure under your basement floor

We recommend installing a battery backup sump pump, too—just in case the power goes out during a storm.

4. Interior Basement Drainage

Water on your basement floor is more than a nuisance—it can lead to mildew, wood rot, and structural damage. An interior drainage system gives water a place to go, fast.

This includes:

• Cutting channels along the base of the basement walls
• Installing a drainage pipe that runs to your sump pump
• Preventing water seepage from reaching your living space

This method works especially well in older homes where exterior waterproofing isn’t feasible.

5. Waterproof Coatings and Sealants

If your basement walls feel damp or musty, a waterproof coating may be part of the solution. While not a fix for major leaks, coatings help with moisture control and surface-level dampness.

What they do:

• Help seal cracks and porous areas on foundation walls
• Reduce vapor transmission and surface condensation
• Work best in combination with other waterproofing systems

They’re often used after repairs to add an extra layer of protection and improve the feel of the space.