We use more and more modern materials when building the walls of the building, guaranteeing the best thermal insulation. One of the materials is porous hollow bricks, characterized by the presence of many closed walls in ceramic walls, very small pores. These pores together with the gaps create an excellent building material with high insulation properties. The production of porous ceramics consists in mixing appropriate admixtures with clay, which, in the firing process, burn up, leaving air voids.