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Below Grade Waterproofing

Commercial Below-Grade Waterproofing Services

Protect Your Foundation from the Ground Up
Water intrusion at or below ground level can compromise the integrity of your entire commercial building. WC Decking & Waterproofing provides expert below-grade waterproofing solutions for basements, foundations, retaining walls, parking garages, and elevator pits across Southern California.

Below-Grade Waterproofing That’s Built to Last

We use advanced waterproofing systems—such as sheet membranes, liquid-applied coatings, and cementitious systems—engineered to resist hydrostatic pressure and long-term exposure to moisture.

Our process includes:

  • Site evaluation and substrate inspection
  • Surface preparation (including shot blasting or cleaning)
  • Crack and joint sealing
  • Application of below-grade waterproof membrane system
  • Drainage mat installation and backfill protection
  • Compliance with commercial building codes and specifications

We tailor every solution to meet the soil conditions, structural load, and moisture levels of your specific property.

Benefits of Below-Grade Waterproofing for Commercial Properties

  • Prevents Water Infiltration at the Foundation Level
    Stops leaks in basements, parking garages, and retaining walls caused by groundwater or poor drainage.
  • Protects Structural Integrity and Reinforcement
    Prevents corrosion of steel reinforcements and damage to concrete over time.
  • Reduces Risk of Mold and Indoor Moisture Issues
    Keeps interior environments dry, safe, and compliant with health standards.
  • Avoids Costly Repairs and Structural Failure
    Proactive waterproofing reduces the chance of foundation settling, cracks, or major renovations.
  • Meets Commercial Construction and Safety Codes
    Our work is approved for commercial-grade applications and moisture control regulations.

Ideal for a Wide Range of Commercial Applications

We offer below-grade waterproofing for:

  • Office Buildings
  • Multi-Unit Residential Complexes
  • Underground Parking Garages
  • Elevator Shafts
  • Commercial Basements
  • Retaining Walls and Foundations

Service Areas

Los Angeles, Orange, Riverside Counties

Defend your commercial building against underground water