A structural panel assembly of rectangular parallelepiped shape that is substantially taller and wider than thick, the structural panel assembly having a first broad side, a second broad side, a bottom end, a top end, a left end, and a right end, the structural panel assembly adapted for use in a structural panel building system, the structural panel assembly comprising:
- a first substrate of sheet material forming the first broad side of the structural panel assembly, the first substrate having an inner face and an outer face;
- a second substrate of sheet material forming the second broad side of the structural panel assembly, the second substrate having an inner face and an outer face, the second substrate spaced from the first substrate to define a distance between the inner face of the first substrate and the inner face of the second substrate;
- at least one metal stud having an elongated configuration and external surfaces, the at least one metal stud extending vertically between the bottom and top ends of the structural panel assembly, positioned in parallel with the first and second substrates, and located adjacent to but spaced from the inner face of the first substrate and the inner face of the second substrate, the at least one metal stud having a width transverse to the elongated configuration that substantially spans the distance between the inner faces of the first and second substrates;
- a first gap formed between the inner face of the first substrate and the at least one metal stud due to the at least one metal stud being located adjacent to but spaced from the inner face of the first substrate, to prevent the inner face of the first substrate from making thermal contact with the at least one metal stud and thereby provide the structural panel assembly with increased thermal insulation capability;
- an adhesive filling material located between the first substrate of sheet material and the second substrate of sheet material and adhesively embedding the at least one metal stud, the adhesive filling material making adhesive contact with the external surfaces of the at least one metal stud embedded therein, the inner face of the first substrate of sheet material, and the inner face of the second substrate of sheet material, wherein the at least one metal stud, the first substrate, and second substrate are glued together as a unit by the adhesive filing material without the use of mechanical fasteners, the adhesive filling material further occupying the first gap and making further adhesive contact therein with the inner face of the first substrate and the at least one metal stud, to adhesively hold together the first substrate of sheet material, the second substrate of sheet material, the at least one metal stud, and the adhesive filling material;
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- a first bottom mounting slot extending along a bottom end of the structural panel assembly and vertically upward to a bottom mounting slot depth, the first bottom mounting slot formed by the absence of adhesive filling material in the first gap between the first substrate and the at least one metal stud at the bottom end of the structural panel assembly, and a first top mounting slot extending along a top end of the structural panel assembly to and vertically downward to a top mounting slot depth, the first top mounting slot formed by the absence of adhesive filling material in the first gap between the first substrate and the at least one metal stud at the top end of the structural panel assembly, the first bottom and first top mounting slots exposing a bottom and top end, respectively, of the at least one metal stud for structural connection of the bottom and top ends of the structural panel assembly.