Insulated pre-formed wall panels

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 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 for 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 to wallboard attached to the wall panel, wherein said insulating material means comprising a plurality of individual strips of insulation material attached to said rib portion edges respectively, further comprising means defining a centrally-disposed channel in each said rib edge, said respective insulation material strip engaging said edges and having a centrally-disposed portion which is received in said channel means, and means for attaching wallboard to said wall panel comprising an individual metal strip attached to each said insulation material strip, said metal strip being positioned for direct attachment to said wallboard, and wherein said plurality of rib portions includes a pair of outer rib portions at least one of which has a tapered wall, aperture means in said tapered wall for receiving a bolt for attaching the wall panel to a like wall panel, and means for presenting a squared surface for receiving a head of the bolt against said tapered wall.