Abstract: A floor frame structural support assembly having a plurality of substantially parallel, longitudinal support members or beams, each of the support members having an inside-directed and an outside-directed wall surface, the inside-directed wall surfaces of the support members being substantially parallel. Disposed between the support members and affixed to the inside-directed surface thereof so as to prevent the inside surfaces from moving from their substantially parallel relationship during handling, transportation, and deployment, is a plurality of substantially rigid, bend-resistive, compression-resistive cross members. Affixed to the outside surfaces of the respective longitudinal support members so as to be substantially collinear with the axis of a respective cross member is a plurality of outriggers. The floor frame structural support assembly may include additional structure such as floor joists, marriage wall beams, exterior wall beams and wall portions which are affixed thereto.