The article reports on the researchofreductionof the capillary water absorption of foamed concrete (FC) by using the porous aggregate such as the granules of expanded glass (EG) and the cenospheres (CS).The EG granular aggregate is produced by using recycled glass and blowing agents, melted down in high temperature. The unique structure of the EG granules is obtained where the air is kept closed inside the pellet. The use of the porous aggregate in the preparation process of the FC samples providesan opportunityto improve some physical and mechanical properties of the FC, classifying it as a product ofhigh-performance. In this research the FC samples were produced by adding the EG granules and the CS. The capillary water absorption of hardened samples has been verified.The pore size distribution has beendetermined by microscope. It is a very important characteristic, specifically in the cold climate territories– where temperature often falls below zero degrees. It is necessary to prevent forming of the micro sized pores in the final structure of the materialas it reduces its water absorption capacity.In addition, at a below zerotemperature water inside these micro sized pores can increasethem by expanding thestress on their walls during the freezing process.Research of the capillary water absorption kinetics can be practical for prevision ofthe FC durability.