Below Grade & Basement Flooring Solutions
Advanced waterproofing and foundation protection systems for basements, underground facilities, and below-grade structures. Engineered to withstand moisture, hydrostatic pressure, and foundation movement.
Foundation Protection Excellence
Comprehensive below-grade solutions for lasting moisture protection
Advanced vapor barrier systems
Superior adhesion to concrete
Withstands groundwater pressure
Accommodates minor movement
Why Choose Our Below-Grade Systems?
Below Grade Applications
Specialized solutions for underground and foundation-level installations
Retail, offices, and storage facilities located below ground level requiring moisture protection and durability.
- • Moisture vapor barriers
- • Anti-slip surface textures
- • Chemical-resistant coatings
Multi-level parking facilities with high moisture exposure and vehicular traffic loads.
- • Hydrostatic pressure resistance
- • Oil and fuel spill protection
- • Crack bridging capabilities
Below-grade mechanical spaces housing HVAC, electrical, and plumbing systems.
- • Seamless waterproof membrane
- • Easy maintenance and cleaning
- • Temperature cycling resistance
How DTI Installs Below-Grade Flooring Systems
Below-grade installations require a fundamentally different preparation process from above-grade work. The primary challenge is hydrostatic pressure — groundwater pushing upward through the slab from below. Standard epoxy coatings will blister and delaminate within months in these conditions without a dedicated moisture mitigation layer underneath.
DTI's process starts with a calcium chloride or in-situ RH probe test to measure the moisture vapor emission rate (MVER). Anything above 3 lbs per 1,000 sq ft per 24 hours requires a moisture-tolerant epoxy primer or a dedicated vapor barrier membrane applied before any coating. We use a two-part epoxy vapor barrier capable of tolerating RH levels up to 99% and hydrostatic pressure up to 15 PSI.
For below-grade commercial spaces — basement offices, underground parking, mechanical rooms — we then apply either a urethane mortar system (for areas with thermal cycling) or a broadcast epoxy (for storage and low-traffic areas). Both produce a seamless, coved finish that eliminates the wall-floor seam where water typically infiltrates.
Typical project timeline: 2 days for surface prep and moisture mitigation, 1–2 days for the flooring system, 24–72 hours cure before foot traffic. We serve commercial properties throughout California's Central Valley.
Below Grade Flooring FAQs
Common questions about below-grade waterproofing and foundation protection