Retaining Walls in Independence, MO

Jackson County expansive clay creates predictable retaining wall failures when drainage is not engineered into the installation. Clay soil absorbs water and expands with significant lateral force — a wall designed only for the weight of soil behind it, without accounting for hydrostatic pressure buildup from saturated clay, will crack, tilt, or overturn within a few freeze-thaw seasons. Independence has substantial grade change on many mid-century residential lots, and the original retaining structures — whether poured concrete, block, or timber — are failing at the same rate as the other original flatwork from that era.

Along the Truman Road corridor and in Independence's hillside residential areas east of the Square, we work on sites where grade changes require both drainage management and structural retention. These sites often have existing walls that have tilted or separated from footings, with saturated clay visible behind the failed wall face. On these projects, we remove the failed structure, install drain tile at footing level, backfill with permeable aggregate behind the wall, incorporate weep holes through the wall face, and set new footings below the KC frost depth of 26 inches.

Independence retaining wall footings are set at a minimum 30 inches below finish grade to account for frost depth and the bearing capacity variation of clay soil. Wall thickness and rebar schedule are calculated to the retained height — walls above 3 feet require engineer-reviewed rebar placement. Weep holes are spaced at 8 feet on center through the wall base to provide positive drainage outlet. Drain tile at footing level drains to daylight or to a sump where site conditions require it.