US Patent 11851875 Foam filled structural plank building foundation with laminated reinforcement

A foam filled structural plank made from a plurality of structural beams assembled together to form a structure capable of supporting the weight of a building thereon, wherein the plurality of structural beams define an enclosure therebetween and an outer perimeter therearound; and a structural building foam such as having expanded polystyrene foam having a density from 1.5 to 3.0 PFC filling the enclosure.