Why the Ground Under Addison Works Against Its Pipes

Nearly every house in town sits directly on a concrete slab, and nearly every slab sits on Blackland Prairie clay. The USDA’s official soil survey for Houston Black clay documents its high shrink-swell behavior, with surface cracks opening as wide as four inches in dry periods. Every late-summer drought pulls that clay away from the slab, every wet spring pushes it back, and the soft copper lines set beneath the concrete flex a little with each cycle. Decades of that motion is why slab leaks cluster in homes from the original construction era, and why late summer is when our slab calls spike.