A total of five full scale ferrocement multi-cell box slab panel were constructed and tested under flexural loads. The main parameters considered in present work were number of wire mesh layers at top and bottom flanges and webs and the positions of the intermediate diaphragms. The behaviour was monitored by reading deflections at mid-span and by observing the crack patterns and mode of failure. From the results obtained, it was found that decreasing number of wire mesh layers at the bottom flanges tend to decrease the load capacity and increase the lateral deflections. It is concluded that the precast ferrocement multi-cell box slab/ wall panels developed in the present work can be used as a building system and comparison of tests results with the standard design loads of buildings showed that the proposed system matches the design loads and can be used in construction of a wide range of buildings.