Lightweight expanded clay aggregate as a material has been known for a long time. It is obtained by heating clay in a rotary kiln up to about 1200 °C. During this process, the organic components of the clay, which are evenly dispersed, are burned. Weight, size, and strength can be precisely controlled during the manufacturing process. Due to its low weight and durability, it is used for light filling in engineering structures, as well as in gardening. Most often, lightweight expanded clay aggregate is used to warm basements, attics, and mezzanine floors. Available both in bulk and as blocks.