Strength of reinforced concrete structural elements such as beams can be reduced due to unintentional error in design, non-compliance of standards, increasing of service loads and others. Therefore, this study deals on strengthening of reinforced concrete beam using cast in-situ ferrocement laminated on the tension face of the beam using epoxy-based adhesive to improve its flexural load-bearing resistance. Ferrocement is the combination of ferrous reinforcement embedded in cementitious matrix. Experiments in this study consist of testing of twelve (12) rectangular reinforced concrete beams strengthened for flexure with ferrocement and three (3) control beam specimens without being strengthened. In the study the diameter, opening size, orientation of wire mesh reinforcement of the ferrocement and the thickness of ferrocement are taken as constant, whereas the main variables are the number of layers of wire mesh reinforcements of the ferrocement. The number of layers of wire mesh varies as 1, 2, 3 and 4 with the same 1.5mm diameter of the wire and 25mm opening of the mesh transversally and longitudinally. Load carrying capacity, mid-span deflection, and mode of failure of control and strengthened beam specimens are investigated during the course of the test. The test results indicate that ferrocement contributes to increase the flexural load carrying capacity of the reinforced concrete beams. The flexural capacity of the beam increases as the layers of wire mesh reinforcement in the ferrocement increases. The ferrocement used in strengthening of rectangular reinforced concrete beams increases the flexural ultimate load carrying capacity by 20%, 30%, 44% and 77% as that of the layers of wire mesh reinforcement in the ferrocement increase as one, two, three and four respectively. In addition to experimental investigation, this paper uses non-linear analytical method to determine the flexural load carrying capacity and to obtain the whole load-deflection curves for reinforced concrete beams. The comparison of the analytical and experimental results confirms that the theoretical curves obtained by analytical analysis shows good agreement with the experimental curves of tested beams.