Abstract. Experimental investigations were carried out in the natural sizes of reinforced concrete three-layer slabs of coatings with a middle layer of expanded polystyrene without internal edges, unlike other designs, which is a “bridge” of cold. Two variants of coating plates are considered, taking into account the thickness of commercially available foam polystyrene plates of 50 and 100 mm with a total thickness of plates of 200 and 220 mm, respectively. Experimental data on crack resistance, the formation and development of cracks in the elements of plates, deflections and bearing capacity are given.

Keywords: coating plates, polystyrene foam, upper and lower concrete layer, mesh, heat insulating layer, reinforcement, heat engineering design, framework, design temperature, cold bridge, three-layer slab.