Thanks to the improvement in mechanical and adhesion properties of polymer resins, Post-Installed Rebars (PIRs) succeeded progressively in replacing cast-in place rebars in some applications by offering equivalent or even higher mechanical properties at ambient temperature. However, the mechanical behavior of PIRs is essentially governed by the mechanical behavior of polymer resins, which is highly sensitive to temperature. Consequently, fire safety presents a potential hazard that should be taken into account when designing. This paper presents an experimental full-scale fire test carried out on the Vulcain furnace of CSTB Champs-sur-Marne on its 7m x 4 m horizontal configuration, in order to test a new fire design method proposed for PIRs. The 2.94 x 2 x 0.15 m 3 tested slab was mechanically loaded by 325 kg and heated following the ISO 834-1 time-temperature curve until its collapse. The experimental time of collapse is compared to that predicted by the new design method.