The necessity for strengthening structural members has increased recently with many challenges that engineers face, including the available space, required improvement, and construction cost. Many methods were proposed in the literature for upgrading the flexural performance of reinforced concrete (RC) beams with limited improvement extent and ductility reduction issues. This study introduces an innovative flexural strengthening method where the ductility and strength capacities of the RC beams were improved using the combination of steel fibers and the polyvinyl-alcohol engineered cementitious material (PV-ECC), forming the hybrid SPH-ECC reinforced jacketing system. The interaction between the un-strengthened RC beam main flexural reinforcement and the strengthening jackets’ geometrical properties was introduced with a proper comparison between the two beam sets. The role of the flexural reinforcement was addressed using the interaction between the beam (3 ∅ 16, 3 ∅ 20, 3 ∅ 25) and the SPH-ECC reinforcement (2 ∅ 16). In addition, the geometrical interaction was examined using three strengthening layer thicknesses (30, 50, and 70) mm while keeping the beam depth at a constant value (325 mm). Results were promising and gave a wide vision of the extent of efficiency of the new hybrid strengthening system.