Those mountains of old automobile tires which have long created mountainous disposal problems may yet emerge among the heroes of our day. A patent has been filed on the use of shredded, carefully articulated and graded scrap tires as a resilient foundation for concrete slabs. The material, as developed by Sylvester L. Anderson of Bridgeport, Texas, is said to offer a dramatic improvement over the traditional method of constructing a concrete slab over a relatively flat base. In practice, a base layer of solid particles of shredded natural or synthetic rubber tires provides a resilient and hydrophobic base. The layer should be of sufficient thickness to effect a discrete layer of the particles at the top of the base. The concrete mix is placed over the layer of particles, and the concrete is allowed to set. The base thus provided offers enough resiliency, according to Anderson, to offset stresses ordinarily placed on concrete slabs through expansion and contraction of the sub-base, such natural shocks of earth tremors, and even the new found risk inherent in the effects of sonic boom on concrete. Anderson even goes so far as to state that a concrete slab can be placed and guaranteed using this process. A major feature of Anderson's invention is to provide, between the concrete and its base, a layer of particulate and resilient solids thick enough to be able to accommodate relative movement and to reapportion any stress concentration induced by such relative movement. Undesired cracking should be alleviated. The shredded rubber solids are hydrophobic, and their denial of capillary action alleviates cases where moisture might diffuse through the layer and into the concrete.