the interior carbon fiber grid 6 and exterior carbon fiber grid 8 a plurality of spacers 28 may be employed in one embodiment of the present invention additionally plastic or metallic connector clips 32 are preferably used to interconnect the carbon fiber strands 10 to the interior carbon fiber grid 6 and exterior carbon fiber grid 8 as further identified in fig1 in one embodiment of the present invention a utility conduit 20 is provided which is at least partially embedded in the insulative core 4 while partially embedded in the interior concrete layer 14 and which is used to contain electrical wiring cabling telephone wiring and other types of utility lines commonly used in the construction of interior walls and building panels the conduit is preferably comprised of a pvc plastic based on the cost flexibility and low heat transfer properties but as appreciated by one skilled in the art may also be a clad metal fiberglass or other materials furthermore the utility conduit 20 may be positioned in the center of the insulative core 4 within the exterior concrete layer 16 or interior concrete layer 14 or may be oriented in a vertical as well as horizontal direction as additionally seen in fig1 an exterior cladding.