The article examines waste waterjet cutting steel. A comprehensive study of waste abrasive cutting was performed: the average and bulk density, particle size distribution, chemical composition were determined. It has been established that waste of hydroabrasive cutting of metals are very fine, heavy sands with a high content of dust-like fraction, in the chemical composition of which oxides of iron, silicon and aluminum predominate.
Keywords: green roof, thermal resistance, strength of parts of the structure, functional zone, limit states, construction, technology and organization of construction