Your slab is moving. We make it permanent.

The fundamentals our engineers measure every decision against — the difference between a lasting fix and a patch.

• Because each swelling clay particle is hemmed in by neighbors that are also trying to expand sideways, lateral movement is largely blocked and the volume change is forced upward. This is why surface heave, rather than horizontal movement, is what damages slabs.
• A perched water table is trapped water sitting on an impervious layer above the true groundwater table, often where a clay lens blocks downward percolation. When perched water sits near the surface it can locally deepen or sustain wetting in the active zone.
• Volume change at any point reflects the change in water held in the clay's structure, so controlling moisture, not adding structural weight, is the practical lever for limiting movement on residential foundations.
• Gravity drainage is more dependable than sump-and-pump systems because pumps fail, often unnoticed until doors and windows start to stick. Use gravity wherever enough elevation difference exists.
• Basements introduce two problems that surface foundations avoid: floor heave from below and lateral pressure that can bow the walls inward when expansive backfill swells.
• The plasticity index (PI) is the difference between a soil's liquid limit and plastic limit, both measured by standardized lab tests. It defines the moisture range over which the clay behaves as a moldable, plastic material and is a primary indicator of swell potential.