Abstract: An insulated building is constructed by placing portable temporary vertical wall supports on a concrete floor slab for the building, hanging styrofoam insulating slabs on steel pins protruding from the supports, leaving beam openings between the styrofoam and the floor slab, and at the top between the styrofoam and the ceiling line for the building. Structurally rigid steel wire mesh is placed over the exterior side of the styrofoam slabs for the walls and is tied through the beam openings to anchors into the concrete floor slab at the bottom and into the other beam openings at the top. A roof is formed by laying structurally rigid steel mesh over the temporary wall supports and covering this roof mesh with slabs of insulation material. After doors and windows are set into the walls thus formed, and electrical and plumbing is roughed in, gunite concrete is sprayed onto the exterior surfaces of the walls and onto the underside of the roof.