Abstract: The invention relates to building structures and, more particularly, to the transverse frame of an industrial building carcass wherein columns carry a crossbar and a supporting member of the building roof arranged above said crossbar. The column portions located above the crossbar are rigidly connected with the latter, forming a U-shaped frame which rests through hinges on the column portions located below the crossbar and the roof supporting member is thrust tightly between the free ends of said U-shaped frame. This layout of the transverse frame reduces the height of the crossbar section to the dimensions which allow it to be carried by rail without separating it longitudinally thus reducing the amount of erection work during the construction of industrial building carcasses and diminishing their height. Such a transverse frame is lighter than the known frames of the same type.