Masonry structures are frequently constructed in developing countries because of their affordability and ease of construction, despite the fact that they are vulnerable and perform poorly during earthquakes. Experimental and numerical studies were carried out to determine the optimum thickness of the isolation layer for a recently developed, low-cost seismic isolation system known as the Reinforced-Cut-Wall(RCW). The parameters of the isolation layer were optimized during the experimental and numerical investigation using hollow concrete blocks. Quasi-static cyclic tests were performed on 1:3 reduced-scale brick masonry wall, incorporating the RCW isolation scheme, validating the better performance of the proposed isolation technique.