FIELD: manufacture of building materials. SUBSTANCE: mortar mix, which can be directly laid onto concrete or onto other load-bearing material, or onto underlaying insulation material such as mineral wool, contains cotton fibers and swelled perlite at perlite-to-cotton weight ratio (10-250):100, preferably 80:100. EFFECT: increased sound-absorbing capacity and suppressed crack formation. 5 cl, 2 tbl
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