Foam concrete (FC) has recently received a lot of attention owing to its excellent properties such as high workability, low density, and low thermal conductivity (TC). The aggregate requirements of FC being different from conventional concrete, the fly ash (FA), the most commonly used industrial residue has great potential to serve as filler in FC. Thus, this work quantifies the effects of FA, (as filler replacement) and polypropylene (PP) fibers on shrinkage, thermal, and mechanical properties of FC made with natural hingot surfactant. In this study, three FC densities were used to test four FA replacement levels (0, 25, 45, and 65 %) and four PP fiber addition levels (0, 0.1, 0.2, and 0.3 % by weight of solids). Results show that increasing FA percentage improves FC’s pore structure, increasing compressive strength and lowering TC. Addition of PP fibers reduced FC shrinkage by 40 % in this study. Despite the stated benefits, adding more PP fiber (0.3 %) caused uneven distribution, decreasing FC compressive strength. Hence the experimental outcomes of present study have proved that addition of optimum levels of FA and PP fibers are sustainable measures to enhance the performance of FC produced with hingot surfactant without affecting the foam stability.