Abstract: A construction material and method of use comprises stone aggregate having physical properties like those of limestone approved by the Iowa State DOT for use in 3i mainline interstate highway concrete stone having a substantial majority of particle sizes between 1 millimeters and 3.35 millimeters. The construction material is adapted for placement under-slab or between outer walls and ground, including between footings from base of footings to grade. The material is optimized to be multi-functional. It can provide drainage, radon mitigation, structural support and thermal insulation, and can be a non-chemical (physical) barrier to subterranean termites.