The eucalyptus and araucaria fibers were used as alternatives to virgin cellulose common in fiber-cement production. Threedifferent types of these virgin-cellulose replacements were utilized as main raw materials while silica sand was the aggregate.Chemical and physical analyses were performed on the raw materials. In the experiments, the effect of various fiber types onthe mechanical strength, water absorption and the density of fiber-cement mixture was studied for 8 wt % additions of thesethree fiber types. The excess water in homogeneous mixtures of the raw materials was first removed and then samples werepressed and baked in the autoclave. Physical and mechanical tests on these samples indicated that the fiber-cements producedwith eucalyptus and araucaria cellulose were mechanically superior than those produced with virgin cellulose.