Abstract: A cementitious, fireproof, wall panel is provided including opposite side faces and pairs of remote upper and lower and opposite end marginal edge portions. At least one side face of the panel has a plurality of generally parallel elongated stud members partially imbedded therein, extending thereacross and projecting laterally outwardly therefrom. The spacing between those portions of adjacent stud members projecting outwardly from the one side face of the panel define outwardly opening channels and insulation panels are snugly received and seated within the channels with the outer surface portions of the insulation panels being generally flush with the outer faces of the stud members. The opposite side face of the wall panel is similarly provided with parallel studs and insulation panels and the latter studs are staggered relative to the studs on the remote side face of the panel.