This study presents a novel investigation into the flexural performance of one-way solid slabs reinforced with geogrid mesh and glass fiber-reinforced polymer (GFRP) bars through experimental, numerical, and analytical approaches. This research explores the combined effect of geogrids and FRP bars, optimizing their configuration to enhance structural performance. Nine concrete slabs were tested, considering key parameters such as reinforcement type, geogrid layer configuration, and placement within the slab section. The experimental program evaluated the first crack load, ultimate flexural capacity, load-deflection behavior, stiffness characteristics, energy dissipation, and failure modes. Results show that integrating geogrid layers with FRP reinforcement significantly improved flexural performance. Using two geogrid layers above the FRP bars increased the first crack load by 25 %, ultimate flexural capacity by 28 %, stiffness by 22 %, and ductility by 40 %. A nonlinear finite element analysis (NLFEA) using ANSYS validated the experimental results with an overall average ultimate load ratio (experimental/numerical) of 1.03, confirming the accuracy of the numerical model. Additionally, an analytical approach was employed to compare the experimental and numerical results with existing design provisions, particularly ACI standards, confirming the accuracy and reliability of the proposed system. Finally, a parametric study further assessed the influence of key design parameters. These findings provide experimental evidence and theoretical support for developing future design guidelines and code provisions for geogrid-FRP reinforced slabs. The proposed system offers a durable, corrosion-resistant alternative to steel reinforcement, particularly beneficial for sustainable construction in aggressive environmental conditions where long-term maintenance reduction is critical.