Abstract: A lightweight poured-in-place concrete builiding component and method of construction in which a plurality of spaced apart structural members with outer regions and a retaining layer system create a segmented form into which a lightweight concrete slurry is poured. The retaining layer system includes a lath which extends across the structural members on at least one outer region of the structual members. The lath is configured to simultaneously support a significant amount of the lightweight concrete slurry within a segmented form and allow a small amount to exude through the lath, thereby reinforcing a concrete component once cured. Alternative embodiments include the introduction of a barrier between a significant portion of a lath and concrete slurry to, at least reduce the amount on concrete which exudes-through the lath. Other altnerative embodiments include the introduction of insulative materials to the concrete slurry to enhance the insulative qualitites of a concrete component.