Abstract: A construction system utilizes a plurality of pre-manufactured units to form a concrete wall. Structurally, each pre-manufactured unit includes a wallboard mounted to an insulation board. Specifically, each wallboard has a first surface and an opposite second surface parallel thereto. For each wallboard, the insulation board is mounted to the second surface of the wallboard and extends to a face substantially parallel to the surfaces. In addition to the pre-manufactured units, the system comprises a temporary backing frame constructed from commercially-available aluminum forms which establish a wall. Also, the system includes a plurality of ties for supporting the units at a desired distance from the backing frame to establish a cavity for receiving concrete to form the concrete wall. After the concrete wall is formed, the backing frame is removed and the pre-manufactured units remain bonded to the wall.