Abstract: The invention relates to a formwork ribbed metal profile member assisting in the construction of metal/concrete flooring, including longitudinal edges (2, 3) defining upper (4) and lower (5) areas connected by webs (6) and comprising recessed deformations, characterized in that at least a portion of each web comprises a recessed deformation (60) defined by a continuous line which extends parallel to the longitudinal direction of the profile member, and the length of which is greater than that of said portion of the web in said longitudinal direction.