The present invention relates to the production of construction materials with low conductivity and density characteristics, particularly to the production of block foamed glass from processed cullet irrespective of the chemical composition of the latter. The method of the invention makes it possible to produce high-quality foamed glass with low labor and power inputs. This is achieved by using, when preparing the feedstock mixture, an aqueous alkaline solution of sodium silicate and/or potassium silicate in an amount of at least 30 to 70 weight % and powdered cullet having an arbitrary chemical composition in an amount within the range of 25 to 65 weight %. The obtained dehydrated feedstock mixture after heat treating at a temperature of 450 to 550°C is ground into a powdered batch which is heated to a foaming temperature within the range of 750 to 830°C.
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