Reticulated cellular ceramics have a variety of potential applications, two of which are being the use as filters and as catalyst supports. The commonly used replica techniques for the production of these materials show several drawbacks, the main ones being the use of a single use template, high process temperatures and multiple process steps. To counter these drawbacks, a completely new approach, using a direct foaming method of waste glass was developed. In general, finely ground waste glass powder mixed with a carbonate is suspended into an acidic water glass solution containing surfactants. After the CO₂-evolution, the pH of the suspension approaches 7, leading to a rapid gelation of the dissolved silica, which in turn leads to the solidification of the liquid foam. After drying, the green body is subjected to a sintering program, removing organic compounds and stabilizing the foam-monolith. The resulting glass foams have a completely reticulated open cell structure, making them suitable for the use as catalyst supports. The main advantages present themselves in the reuse of waste glass, that requires very low sintering temperatures below 700 °C.