Foundation & Below-Grade Waterproofing

Comprehensive moisture mitigation and concrete sealing to protect the structural integrity of your building foundation.

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A concrete foundation wall being treated with a professional waterproofing barrier

Protect Your Building from the Ground Up

Hydrostatic Pressure Resistance

Blind-Side & Positive-Side Sealing

Moisture Barrier Installation

Structural Crack Injection & Repair

Foundation & Below-Grade Waterproofing

The foundation is the most critical part of any structure. SPL Waterproofing provides specialized systems to keep moisture out of your basement, crawlspace, and foundation walls, ensuring long-term structural health.

Foundation waterproofing

The Hidden Danger of Ground Moisture

Concrete is naturally porous. Without a professional moisture barrier, groundwater can be absorbed into your foundation through capillary action. This leads to:

  • Efflorescence: White, powdery salt deposits that signal moisture movement.
  • Reinforcement Corrosion: Moisture causing rebar to rust and expand, cracking the concrete from within.
  • Mold & Indoor Air Quality Issues: Damp foundations create the perfect environment for mold growth.
  • Structural Settling: Moisture changes in the soil around an unsealed foundation can lead to shifting and cracking.

Our Below-Grade Solutions

We utilize a variety of advanced materials to create a permanent barrier between your structure and the earth:

Liquid-Applied Rubberized Membranes

Flexible, seamless coatings that bond directly to concrete and can bridge small settling cracks as they develop.

Sheet Membrane Systems

High-durability barriers used in new construction and deep foundation applications to provide maximum protection against hydrostatic pressure.

Bentonite & Crystalline Waterproofing

Systems that react with water to form a permanent, insoluble seal within the pores of the concrete itself.

Professional Crack Injection

If your foundation already shows signs of cracking, we use high-pressure epoxy or polyurethane injection to fill the void completely, restoring structural integrity and stopping water at the source.

Don’t wait for a small leak to become a major problem. Protect your foundation with the experts at SPL Waterproofing.

Frequently Asked Questions

What is the difference between positive and negative side waterproofing?

Positive-side waterproofing is applied to the exterior face of the foundation (where the water hits), while negative-side is applied to the interior.

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Can you fix a basement that is already leaking?

Yes. We use high-pressure crack injection and specialized interior drainage or coating systems to stop active leaks and prevent future intrusion.

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Why is foundation waterproofing important in California?

Even in dry climates, groundwater and irrigation can create hydrostatic pressure that forces moisture through concrete, leading to mold, efflorescence, and structural weakening.

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