The study presents the results of developing a granular insulation material for new construction infrastructure. The material can be used for heat and sound insulation of ceilings, roofs, floors, external walls and enclosing building structures with closed permanent formwork; insulation of water supply and heating pipes; backfill when installing drainage. The technology of obtaining granular insulation material has been developed, which includes heat treatment of a mixture of microsilica, alkali, modifying additive at 95 °C and atmospheric pressure, moulding of raw granules and their low-temperature blowing at 400 °C. It was found that during the heat treatment of raw granules there is a gradual removal of free and physically bound water without destruction of the silicate framework at 130–150 °C. The crystalline phase of granular material is represented mainly by β-quartz and α-cristobalite. An effective thermal insulating material on the basis of local industrial waste with bulk density from 48.49 to 216.49 kg/m3, total porosity from 95.96 to 87.14% and thermal conductivity less than 0,06 W/(m °C) for grains of 10–20 mm fraction was obtained. It is revealed that fine active mineral additives (naturally burnt clay and fly ash) contribute to the increase of compressive strength from 0.08 to 1.35 MPa and decrease of volumetric water absorption of grains from 12.17 to 4.24%. The mass loss of the material after 15 cycles of alternate freezing and thawing in the humidified state was reduced from 11.36 to 2.07%.