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The paper presents studies of changes in the physicomechanical properties of samples based on lime-limestone compositions with rice husk filler hardening in an environment with a high concentration of carbon dioxide. The samples are semi-dry pressing cylinders made of a mixture of hydrated lime, ground limestone and a filler in the form of rice husk in order to reduce the density and increase the heat-insulation ability of building materials based on this raw material mixture. The studies showed that there is an increase in the strength of the samples due to the transition of portlandite to calcite during forced carbonization. The possibility of using waste products of plant origin by the example of rice husk in the production technology of heat-insulating building materials using artificial forced carbonization which will allow obtain products with the following characteristics: compressive strength 2.2 – 4.0 MPA at a density of 700 - 1200 kg/m³, thermal conductivity – 0.11-0.13 W/m•K, has been proved.