Abstract: A system and method for transporting building materials is provided. The system generally comprises end units and interior units having bolster assemblies and cradles. The bolster assembly preferably comprises a beam, D-rings, and a plurality of attachment plates configured to allow for the attachment of a cradle having a shape configured to securely fit the shape of a building material. Two or more end units of the system may be secured to a transport vehicle, such as a railcar, and building materials may be placed within the cradles, thus stabilizing the building materials and protecting them from damage. Two or more interior units may then be used to create layers of building materials before being topped with two or more end units. A securing member may be used to fasten the end units and interior units to one another, which secures the one or more layers of building materials to the transport vehicle in a way that will prevent shifting of the building materials during transport.