What the River Left Behind
Brazos bottom soils are high in expansive clay minerals, and that means real seasonal movement rather than the theoretical kind. Anyone who has owned a house in Richmond through a drought summer has watched cracks open in the yard wide enough to lose a garden hose in, then close again over a wet winter. The soil is doing that under your patio too, and it does it unevenly — more where the sun bakes it, less where a tree shades it, differently along a foundation that has been watered than out in open lawn.
A rigid slab has one response to that: crack somewhere. A properly built paver field has a better one. It is a flexible pavement made of small units over compacted aggregate, and it distributes movement across thousands of joints instead of concentrating it into a single failure line. That is the honest reason we recommend pavers here — not appearance, but the fact that the assembly and the ground are compatible.
