A bowing wall is losing an arm wrestling match with the soil.

Bowing Walls: diagnosed and explained.

A bowing wall means lateral soil pressure is winning against a wall built mainly to carry weight downward. Most foundation problems are vertical; this one is sideways. Stem walls, garage walls, and retaining walls hold back soil, and soil pushes back, especially when it is wet. When that lateral pressure exceeds what the wall was designed to resist, the wall deflects inward, and you see it as a visible curve or bulge, a horizontal crack running along the wall's midsection, or stair step cracking near the ends where the wall is anchored. The physics is straightforward: saturated soil weighs far more than dry soil, and expansive clay adds its own swelling force on top of the water weight. Every wet season loads the wall harder, the wall creeps a little further inward, and unlike vertical settlement, this failure mode ends in a wall that can no longer carry its load at all if ignored long enough. Block walls show it earliest because their mortar joints open along the bulge. Poured concrete resists longer but bows and cracks horizontally under the same pressure. In Southern California, Arizona, and Nevada, bowing shows up most on hillside properties with retaining conditions, on garage and stem walls holding back a grade change, and anywhere drainage sends water into the soil behind a wall. Bowing is progressive and structural, which puts it in the small group of symptoms worth acting on promptly rather than watching.

For the repair side of this, the foundation repair solutions page lists every method Dalinghaus installs, including the ones that fix problems other than bowing walls.