The results of studies of modified foam concrete with products of processing of ash and slag materials are given in this article. The use of ash and slag as raw material in the production of basic building materials leads to reduction of 15-30 % their prime cost. The goal was to study the efficiency of the aluminosilicate microspheres from ashes and slag mixtures of Seversk CHP plant in foam concrete technology. The optimal composition for the production of effective foam concrete is the aluminosilicate microspheres in an amount of 10 % by weight of cement
