FIELD: manufacture of building heat-insulating articles, particularly, roastless, autoclave-free building materials. SUBSTANCE: method includes wet grinding of silica-containing to obtain the following fraction composition, %: 5-20 mcm 20-40; 20-50 mcm 12-30; 50-100 mcm 1-25; the balance 0.1-5 mcm; mixing fractions with subsequent mixing with filler in the form of expanded polystyrene preliminarily ground to fraction composition, %: 3-5 mm not above 50; the balance 0.3- mm; molding, heat treatment of articles at temperature of 80-120 C, and holding in alkali solution heated up to not above 60 C. Manufactured articles have density of 0.8 kg/cu.cm and heat conduction of 0.26 W/m.K. EFFECT: higher efficiency. 1 tbl
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