Below Grade Waterproofing
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Why Below Grade Waterproofing Matters
Any portion of a building that sits below ground level is constantly exposed to moisture in the surrounding soil. Without a high-performance waterproofing system, this moisture can seep into joints, walls, and slabs—causing structural damage, corrosion, and mold.
Allied Coatings delivers targeted solutions that block moisture, protect structural components, and extend the life of critical infrastructure.
Structural Protection from the Ground Up
Below grade waterproofing is a critical defense against one of the most destructive forces facing a structure: water. At Allied Coatings, we specialize in below grade waterproofing systems that protect foundations, basements, and other subterranean elements from long-term water intrusion, hydrostatic pressure, and moisture-related deterioration.
Whether you're working on new construction or retrofitting an existing structure, our systems are engineered for performance, code compliance, and lasting durability.
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Benefits of Allied Coatings Below Grade Waterproofing Systems:
-
Full Moisture Barrier
Our systems prevent water penetration through foundation walls, joints, and underslab areas—protecting the structure from inside and out. -
Built to Withstand Hydrostatic Pressure
Engineered materials resist sustained groundwater pressure, even in high-moisture soils or poorly drained conditions. -
Supports Structural Longevity
Reduces risk of concrete deterioration, rusting rebar, and substrate fatigue caused by prolonged water exposure. -
Improves Indoor Air Quality
Stops the conditions that allow mold, mildew, and musty odors to form in lower levels and basements. - Energy Efficiency Boost Dry foundations help improve temperature stability, leading to better insulation performance and lower HVAC demands.
- Broad Application Compatibility Solutions designed for foundation walls, elevator pits, underground parking, podium decks, and more.
Benefits of Allied Coatings Below Grade Waterproofing Systems:
-
Full Moisture Barrier
Our systems prevent water penetration through foundation walls, joints, and underslab areas—protecting the structure from inside and out. -
Built to Withstand Hydrostatic Pressure
Engineered materials resist sustained groundwater pressure, even in high-moisture soils or poorly drained conditions. -
Supports Structural Longevity
Reduces risk of concrete deterioration, rusting rebar, and substrate fatigue caused by prolonged water exposure. -
Improves Indoor Air Quality
Stops the conditions that allow mold, mildew, and musty odors to form in lower levels and basements. -
Energy Efficiency Boost
Dry foundations help improve temperature stability, leading to better insulation performance and lower HVAC demands. -
Broad Application Compatibility
Solutions designed for foundation walls, elevator pits, underground parking, podium decks, and more.
Benefits of Allied Coatings Below Grade Waterproofing Systems:
-
Full Moisture Barrier
Our systems prevent water penetration through foundation walls, joints, and underslab areas—protecting the structure from inside and out.
-
Built to Withstand Hydrostatic Pressure
Engineered materials resist sustained groundwater pressure, even in high-moisture soils or poorly drained conditions.
-
Supports Structural Longevity
Reduces risk of concrete deterioration, rusting rebar, and substrate fatigue caused by prolonged water exposure.
-
Improves Indoor Air Quality
Stops the conditions that allow mold, mildew, and musty odors to form in lower levels and basements.
-
Energy Efficiency Boost
Dry foundations help improve temperature stability, leading to better insulation performance and lower HVAC demands.
-
Broad Application Compatibility
Solutions designed for foundation walls, elevator pits, underground parking, podium decks, and more.
Latest Projects
Location
La Jolla, CA
Work Performed
Approx 862 sq ft
size
Approx 862 sq ft
Additional Information
Finished in the Knockdown Texture and Sealed in the color Hickory
Location
Orange County, CA
Work Performed
Concrete Resurfacing
size
Approx 7000 sq ft
Additional Information
Hand trowel finish with color stain and epoxy top coat
Why Work With Allied Coatings?
With over 40 years of experience, Allied Coatings is a trusted expert in foundation and below grade waterproofing across California. Our trained, in-house technicians install fully customized systems for both new construction and retrofits. We understand the demands of local soils, climate, and building codes—and provide documented, inspection-ready installations. From project start to long-term performance, we offer responsive support and reliable results.
Our Waterproofing Process
We start every project with a full site assessment, evaluating water tables, hydrostatic pressure, drainage conditions, substrate compatibility, and code requirements. Based on these insights, we recommend the best-fit solution using high-performance materials such as cold-applied membranes, sheet-applied barriers, cementitious coatings, bentonite-based panels, and protective drainage composites. Every installation is detail-focused, with precision at seams, penetrations, and terminations to ensure full system integrity.
Where We Install Below-Grade Waterproofing
We provide waterproofing for foundation walls, basement slabs, retaining walls, crawlspaces, utility tunnels, elevator pits, planter boxes, podium decks, and underslab areas. Each system is customized based on soil conditions, drainage, building design, and exposure risks.
