Foam glass as a building construction material  is competing with insulating polymeric and fiber materials as it is a good insulator. The low flammability, thermal stability and high chemical durability are a distinct advantage over polymeric materials. The possibility to produce foam glass using industrial wastes was investigated in this paper: three types of recycled glass wastes (window panes, bottle glass and glassware) together with fly ash were the main raw materials while SiC was used as foaming agent. Two different weight ratios glass waste: fly ash: SiC (80:10:10 and 70:20:10) were used for the foam glass synthesis. The raw materials as powders were mixed together with and then pressed into cylinders using ethylene glycol as binder. The heat treatment was conducted at 900°C for 5 and 10 minutes respectively. Optical microscopy, apparent porosity and apparent density and chemical stability of the foam glasses were used in order to characterize the obtained products as insulator materials for the building industry. The foam glasses obtained from a 5 minutes heat treatment process had an apparent porosity of 37.8-41.3% and an apparent density of 1.03-1.22 g/cm³ compared to those obtained from a 10 minutes heat treatment process, having an apparent porosity of 66.7-69.5% and apparent densities of 0.51-0.55 g/cm³. The obtained results confirm the alternative producing foam glass from glass wastes.