Spring storms
Flash flooding and saturated soil can trigger sudden settlement.
01The rocky side
On the Hill Country side, in the hills toward Canyon Lake and Bulverde, limestone is often close to the surface. Houses on rock tend to stay put, but slopes, runoff and partial rock contact cause their own problems.
02The clay side
On the prairie side the ground flattens into prairie with deep clay. These soils swell and shrink sharply, which is behind most slab movement in Seguin, Cibolo and eastern New Braunfels. House leveling is common here.
03Houses that sit on both
Some lots have rock under one end and clay under the other. That can crack a slab along the line where support changes. An evaluation with elevations is the only way to know.