Abstract: The present inventive building and the construction method thereof uses a joined-and-filled-in-situ casing system from which to provide the foundation, exterior walls and interior walls of a structure using materials that are high strength, extremely durable, highly insulating and fire-retardant. The present inventive building and the construction method thereof provides a solution to the excessive wastes generated during conventional construction methods by utilizing construction materials that are recycled by being shredded and used as insulating fill. The present inventive building and construction method thereof incorporates an improved electrical wiring system that is particularly suited to the above casing system. The inventive wiring system provides an improved gang-box and wire conduit means that is much easier to install than convention wiring methods. Live wires are encapsulated in a substantially fire-proof medium, and the location of wiring within walls is consistent and hence predictable.