used in this study included ASTM Type1. Portland cement, lime- stone powder, sand, water and natural fibers at the levels of 5%, 10% and 15% by weight of binder ASTM C494
The water-binder(wlb) ratio was 0.25, which is applicable for fiber cement materials in the manufacture of roof sheets and sidings.Mix proportions of natural fiber cement mortars studied are summarized in Table 1. OPC denotes the control cement mortar mixed with Portland cement Type1. C(x) and POx) denote cement mortars in which coconut coir fiber and oil palm fiber, respectively, were used as Portland cement replacements at x% by weight of binder.