It is a system developed for use in metal mezzanines slabs in buildings. Its basic components are: Corrugated sheet with indentations (losacero), Concrete (f´c=200 kg/cm2), mesh (reinforcement temperature) and as optional shear connectors for composite beam effect or to increase the capacity own losacero. By using clear steepness allows larger without requiring temporary propping at the time of placement of the concrete as well as for service stage.