Abstract: A method for stabilizing a slab foundation comprises a narrow, vertical moisture barrier assembly spaced outside and surrounding the perimeter grade beam of the slab foundation by a predetermined distance, and extends to preferably five feet below surface grade. The narrow trench for the barrier is preferably less than three inches wide. A membrane formed of a synthetic composition forms a moisture barrier against one wall of the narrow trench, and is held in place by back fill. The moisture barrier is intended for use in expansive soils that are subject to shrinking and swelling.

Abstract: An apparatus for stabilizing a slab foundation comprises a narrow, vertical moisture barrier assembly spaced outside and surrounding the perimeter grade beam of the slab foundation by a predetermined distance, and extends to preferably five feet below surface grade. The narrow trench for the barrier is preferably less than three inches wide. A membrane formed of a synthetic composition forms a moisture barrier against one wall of the narrow trench, and is held in place by back fill. The moisture barrier is intended for use in expansive soils that are subject to shrinking and swelling.

Abstract: A tilling/stabilization apparatus for tilling and stabilizing a roadbed or other base layer of soil includes a large manifold for receiving metered amounts of pressurized fly ash or other powdery filler, binder, and/or sealer material and injecting it in the vicinity of a rotating tiller that is tilling the roadbed. A water manifold passing through a housing surrounding the tiller produces a dense water mist inside the housing, causing dust to settle and providing a cementitious mix of the fly ash with the tilled roadbase material. Reliable, economical filling of roads and stabilization of a road base is achieved.