Abstract: The invention relates to designs for the linings and roofs of heat-engineering units for mechanical engineering and can be used in the construction of industrial furnaces in the metallurgical, heat-engineering, petroleum-processing and petrochemical industries, in the production of construction materials and in other branches of industry. The aim of the invention is to produce a strong refractory lining for resistance furnaces with a low consumption of electrical energy and a reduction in the weight and overall dimensions of the furnace. All parts of the furnace lining are formed using monolithic blocks made of high-strength refractory, electrically nonconductive phosphate concretes and are used as load-bearing construction elements. Said elements are used in resistance furnaces with an operating temperature of up to 1000° C.