Steel–concrete composite slabs represent an efficient floor solution combining the key performance of two different materials: the concrete, able to resist to compressive stresses and the steel of the hi-bond thin profiled sheeting, supporting tensile forces. In the actual design procedures, only standard slabs are concerned and the influence on the load carrying capacity of steel rebars in addition to the profiled steel sheeting is not considered. For this reason, an extensive experimental campaign has been carried out, which is summarized in the paper, comparing the results obtained on concrete-steel slabs with or without the use of longitudinal steel bars embedded in the concrete. The experimental results were then used to evaluate the longitudinal shear strength of the slabs considering or neglecting the presence of the additional steel rebars.