Frisco sits at the boundary of Collin and Denton counties, and both sides of that line share the same underlying problem: expansive clay formations that rank among the most reactive soils in Texas. It’s a detail most builders don’t advertise, because it doesn’t match the story a brand-new home in Stonebriar, Panther Creek, or Phillips Creek Ranch is supposed to tell. New construction slabs are poured on the same expansive clay as everywhere else in North Texas, and that clay doesn’t care how recently the drywall was painted. Through a Frisco summer, prolonged heat waves pull moisture out of the ground at a rate that outpaces even a well-maintained irrigation system, and the clay shrinks away from the edges of the slab, sometimes by several inches. When cooler weather and rain return, the same clay swells back — unevenly, because the drying never happened at a uniform rate across the footprint of the house. That shrink-and-swell cycle repeats every year, and it’s why homes built as recently as five or ten years ago in Frisco’s master-planned communities are already showing their first foundation symptoms.