Chatham-Kent sits on the clay plains of southwestern Ontario, where annual precipitation exceeds 900 mm and seasonal freeze-thaw cycles run deep. Those heavy, lacustrine clays shrink and swell with every moisture change — a behavior that has cracked foundations and buckled pavements across the municipality. Our team approaches each project with a clear protocol: measure free swell, swelling pressure, and activity index before any slab or shallow footing gets poured. For residential subdivisions near the Thames River, we often combine expansive soil evaluation with a calicata exploratoria to visually verify desiccation cracks and root penetration depth. The goal is simple: quantify the heave risk so the structural engineer can specify the right floor slab and drainage system from day one.
A plasticity index above 50 in Chatham-Kent lacustrine clays means you need deeper footings and a moisture barrier before you pour any concrete.