Method for making insulated pre-formed wall panels for attachment to like insulated pre-formed wall panels

A method of making a wall panel for attachment to like wall panels for building a wall, the method comprising the steps of:

• (a) providing a mold for casting a concrete member having a generally planar portion including an inner surface and an outer surface and a plurality of rib portions extending from the inner surface to an edge of each respective rib portion,
• (b) nesting at least one insulation strip within a respective spring member so that each respective spring member extends about sides of each respective at least one insulation strip and terminates in end portions which extend inwardly relative to the sides of each respective at least one insulation strip,
• (c) covering the end portions of each respective spring member with a thermally insulating material to limit thermal conductivity from each respective rib portion of the concrete body to each respective strip member,
• (d) selecting each respective spring member to be biased against respective walls of a mold portion corresponding to each respective rib portion of the concrete member when each respective at least one nested insulation strip is inserted therein,
• (e) inserting each respective spring member with the at least one nested insulation strip in the mold portion, and
• (f) casting the concrete member in the mold with each respective spring member with the at least one insulation strip being unitarily attached to each respective rib portion edge of the concrete member with the thermally insulated end portions of each respective spring member being anchored in each respective rib portion of the concrete member to make a wall panel.