<p>The article is devoted to the issues of heat preservation of the developed heat-resistant reinforced concrete slab in kilns. It contains the information about the scientiėc research conducted by the authors over the years, the results on the priority and relevance of the problem, the conclusions of the tentative experiments, new research results on the porosity and structure of the material of elaborated the reinforced concrete slab. ĉis heat-resistant reinforced concrete slab has been tested at brick factories in Namangan and Andijan regions and has practical <br /> signiėcance in manufacturing.</p>