If you plan to build, start with soil testing . It sounds basic, yet it can save you from cracks, drainage headaches, and surprise costs later. Dallas soil can look calm on top. However, a few feet down, clay can act like a sponge. It swells when it gets wet and shrinks when it dries out. So the ground can move, even when your plans look perfect. Dallas clay isn’t “bad,” but it plays by its own rules Many North Texas sites sit on clay-rich soils. Clay holds water longer than sand, so it stays soft after storms. Then it dries out during hot weeks and tightens up. In other words, moisture changes can make the soil change shape. That matters because buildings need steady support. When the ground shifts, you may notice doors that stick, cracks in drywall or brick, or sidewalks that lift and settle. Also, you may see water pooling near the house because the soil won’t absorb it fast enough. Here’s the key link: soil behavior and drainage behavior go together. When the soil traps water, surf...