This paper describes a proposal for the modification of traditional sand-lime products using the granulate of foamed glass and lithium polysilicate. These fillers are intended to reduce gross density in a dry state and retain the highest possible compressive strength of the obtained material in comparison to the starting material. Basic functional property tests were thus performed on blocks made from the terminal material, i.e. compressive strength, gross density in the dry state, water absorption. The results of this research are discussed and presented in tabular and graphic form of this paper.