Abstract: A method for interlocking building panels that have a channel integrally formed in and substantially coextensive with each panel edge so that abutting panel edges form a generally vertical joint post channel and adjacent panel edges form a generally horizontal beam channel, atop a poured foundation or other supporting structure to fabricate a building wall, which includes the steps of: placing into the supporting structure at the point on the supporting structure where the joint post channels are formed between abutting panels, a first rebar that extends at least partially into the joint post channel; inserting a second rebar into the joint post channel so that a first end is juxtaposed with the extending end of the first rebar, and a second, opposite end extends from the joint post channel; bending the second, extending end of the second rebar so that once bent, it lies in the generally horizontal beam channel intersecting with the joint post channel; and, filling both the generally vertical joint post chann