<p>This article presents an experimental study into the structural performance of concrete Bubble Deck slabs reinforced with Glass Fiber-Reinforced Polymer (GFRP) bars. By using plastic spherical void-formers, Bubble Deck technology considerably lowers the slab’s self-weight. This technology reduces the amount of material used by a significant amount by carefully replacing non-structural concrete with voids, which results in cost savings and improved sustainability by minimizing the total carbon impact, improving load distribution, and decreasing construction waste. To solve durability issues related to steel corrosion, GFRP reinforcement is used. Both monotonic (ultimate capacity) and repeated (Unidirectional cyclic loading) loads were applied to seven full-scale slab specimens, three samples as ribbed slab and other four as Bubble Deck slab of which, including, two specimens reinforced with conventional steel and five of which were reinforced with GFRP. Failure modes, ultimate flexural capacity, cracking behavior, and load-deflection response are the main topics of the analysis. According to the results, the crack pattern and flexural behavior depend on the steel-reinforced slab exhibited a significantly higher ultimate load compared to the GFRP-reinforced slab and stiffness and ductility of steel slab was much stiffer and failed at a lower deflection compared with the GFRP slab. As well as, the repeated loading protocol significantly reduced the capacity of the ribbed GFRP slab, but the bubble deck slab proved relatively more robust against cyclic degradation in terms of ultimate load.</p>