Start with conditions, not guesswork
Unlike the fall-line cities south of it, Sandy Springs sits entirely in the Piedmont: granite outcrops close to the surface, red clay on top, and steep lots along the Chattahoochee where drainage and grading do most of the work a foundation plan has to account for.
Build a complete scope
- What was measured, and whether it was measured across a full wet-and-dry season
- Whether the movement follows the seam of a later addition rather than the original house
- How uphill water reaching the foundation is being addressed, not just the wall itself
- The repair method proposed, and what was ruled out before landing on it
- Access on a sloped wooded lot, restoration afterward, and what the warranty actually covers
Sandy Springs context
Two of the local conditions do most of the damage here, and they compound each other. Georgia red clay swells when it takes on water and shrinks when it dries, so movement in this soil is often seasonal rather than steadily progressive -- which is why measuring across a full wet-and-dry cycle before committing to piers is usually the cheaper decision. Sandy Springs then adds slope: on the wooded hillside lots that characterize much of the city, water arrives at a foundation laterally from uphill rather than simply falling on it, and that loading is what cracks a wall rather than settles a corner. The third factor is the building history. Mid-century ranches here have frequently been added to more than once, and an addition founded to a different depth than the original house will move independently of it -- so a crack that follows the seam between old and new construction is telling you where to look before any diagnosis is made.