Abstract: Off-site factory built structure employs a chassis including two interior longitudinal beam members joined at their ends to a perimeter structure. A floor system is integrated within the chassis perimeter. A ledger member is fixed to the inner surface of each longitudinal perimeter member so that a top surface lies in a plane coincident with top surfaces of the interior longitudinal beams. Lateral members are coupled to the tops of the interior longitudinal beams and to the top of the ledger members. The lateral members include secondary stiffening members such as C-channel members, metal Z-channel members, or other metal members of similar structural capacity, spaced apart from each other by a maximum distance S, related to the width of the floor system W, by the equation: S 12?½W.

Abstract: Off-site factory built structure employs a chassis including two interior longitudinal beam members joined at their ends to a perimeter structure. A floor system is integrated within the chassis perimeter. A ledger member is fixed to the inner surface of each longitudinal perimeter member so that a top surface lies in a plane coincident with top surfaces of the interior longitudinal beams. Lateral members are coupled to the tops of the interior longitudinal beams and to the top of the ledger members.