Below-Grade Waterproofing Services

Our below-grade waterproofing services protect foundations, basements, and other below-ground spaces from water intrusion. When these systems fail, they can cause mold, corrosion, and structural damage. We help you make sure everything stays watertight—from the ground up.

What is Below-Grade Waterproofing?

Below-grade waterproofing means using systems that stop water from entering underground spaces. For example, we assess membranes, drainage mats, and sealants. Additionally, we check tie-ins and joints to prevent weak spots that lead to future problems.

Why Waterproof Foundations?

• Keep basements and parking garages dry
• Protect concrete and rebar from long-term damage
• Meet local code and warranty requirements
• Prevent mold, humidity, and indoor air quality issues
• Avoid costly excavation or retrofits later

As a result, below-grade waterproofing services reduce long-term costs and increase the reliability of your foundation system.

Case Study: Transit Station Foundation

Problem: Water was leaking into mechanical rooms at platform level.

Solution: Our team coordinated the design details, installed a drainage mat, and improved flashing tie-ins. We also verified each layer during QA inspection.

Result: No leaks post-construction and full warranty approval.

Learn more about below-grade design at the WBDG Envelope Watershed Guide.

Our Below-Grade Waterproofing Services Include:

• Construction drawing and detail review
• On-site QA/QC waterproofing inspections
• System evaluations and diagnostics
• Tie-in support for curtain walls, pits, and podium decks
• Leak testing and remediation planning

If you’re planning or repairing a foundation, our below-grade waterproofing services deliver reliable, code-compliant solutions you can build on.