Abstract: A structural frame for a building including multiple truss members and multiple column members. The column members are comprised of multiple upstanding support members and are connected to the truss members by means of a mortise-and-tenon type connection. A plurality of T-purlins, having face boards and cross brace boards, interconnect the rafters of the truss members and the joists of the truss members. A face girt is secured to the lower ends of the rafters so that an external roof structure can be attached to the girts at the same slope and elevation from the rafters as compared to the face boards of the T-purlins.