Abstract: A building construction comprising a concrete footing in situ having a plurality of metal members extending outwardly therefrom. At least one module for each wall and each ceiling of the construction is formed by bending an open wire mesh in a substantially U-shaped configuration and closing the open end thereof with a joist. At least one core is disposed within each module and the one is maintained in place with wire ties connected to the mesh and extending through the core and spacing blocks between the core and mesh. Each joist is connected to at least one projecting metal member and the modules are connected by interconnecting the joists thereof. A layer of concrete is formed around the mesh and completely surrounding the core and joists.