Insulated pre-formed wall panels

In a prefabricated wall panel for installation with like wall panels for building a wall, the wall panel comprising a unitary combination of a member having a generally planar portion including an inner surface and an outer surface and a plurality of spaced rib portions integral with said planar portion and extending from said inner surface thereby defining voids therebetween form receiving insulation, said rib portions having edges which are remote from said planar portion, means comprising insulating material attached to said edges for reducing thermal conductivity from said rib portions, and means for attaching wallboard to the wall panel;

• the improvement wherein said unitary combination further comprises an under drain means connected to a said member and said under drain means comprises a pipe portion, said generally planar portion has a portion which extends outwardly from said outer surface and is shaped to define a trough for receiving said under drain pipe portion, said member having at least one reinforcement member embedded therein, and the wall panel further comprising means for connecting said under drain pipe portion to said reinforcement member.