Abstract: A new design for joists using cold rolling steel sheets and integrated parts is provided, that creates a sturdy yet easy to construct structure.

Abstract: Joists designed to be used as roof cover in the form of composite ridge in different buildings of residential, commercial and official types and can be generalized to pre-fabricated shear walls. Simplification of their execution process at the construction stage accelerates roof execution and reduces the need for using costly equipment. On the other hand, the existence of installations under the roof reduces the costs of pavement and environmental pollutions decrease due to lighter roof and structures and due to the utilization of less construction materials.