FIELD: manufacture of building materials. SUBSTANCE: invention relates to manufacturing cellular building materials and products that can find use in fabrication of heat-insulation and structural materials useful in industrial and civil construction. Method of invention comprises foaming of components in mixer, stirring with foam former and liquid glass, molding, ageing, and stripping of formwork followed by drying, said liquid glass being made from microsilica with silicate modulus 2-4. First, 1 to 7 parts of indicated liquid glass having density 1.1801.20 g/cu.cm are stirred with foam former in high-speed constrained-motion mixer to attain 10-12-fold foaming, after which 35-42 parts of liquid glass with density 1.35-1/45 g/cu.cm are added and resultant foam is mineralized with microsilica originated from silicon production. Products obtained from such cellular materials have stable values of average density from 830.0 to 300.0 kg/cu.m. EFFECT: enabled foaming of liquid glass with elevated density and manufacture of waterproof products with stable density values at lower cost. 2 tbl
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