FIELD: construction engineering. SUBSTANCE: building member designed for fabricating windows of factory buildings, store rooms, fair or museum buildings, or lantern lights, or light domes on roofs has at least two parallel glazing sheets made of transparent material; sheets are spaced apart. At least one fiber-reinforced tile and/or at least fiber-reinforced aerogel mat is placed in clearance between sheets. Aerogel mat has water-repelling surface groups. Porosity of aerogel matrix is more than 60 % and its density less than 0.6 g/cm3. EFFECT: improved heat- and sound insulation of building member. 10 cl
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