Genuine khrushevkas were made exclusively out of prefab concrete slabs. Each wall was one slab, the ceiling was one or two slabs per room and the sound isolatio

Genuine khrushevkas were made exclusively out of prefab concrete slabs. Each wall was one slab, the ceiling was one or two slabs per room and the sound isolation issue was less due to the thickness of the slabs and more due to poor fitting of the slabs or bad sealing of the joints.