The aim of this work was to study the feasibility of incorporation of nickel slag as a raw material for production of roof tiles. Tests were carried out with the addition of different percentages of slag in the clay mass in order to find the composition for optimized product’s properties. The results indicated that the addition of up to 25% of nickel slag was advantageous, with an increase in density and mechanical strength and reduction of permeability and water absorption. There was no change in the leaching parameters measured according to the Brazilian Technical Standards.