In accordance with ASTM c1185 and ASTM c1186 standards the experiments for determining the mechanical properties of the different cellulose fiber cement flat sheers were conducted on 30 x 15 x 0.5 cm spedmen to obtain the products that are suitable to use. Both types of cellulose fibers were tested using ratios of 5% and 10% by weight of Portland cement to determine their flexural strengths