Core lift shafts 81 m high also exist in laminated timber: in the Mjøstårnet tower near Oslo, diagonal bracing members up to 1.5 m deep were incorporated in the timber framing. The first ten storeys have lightweight hollow box floors with a rock-wool filling. From the 12th to the 18th storeys, 30 cm concrete slabs help to damp vibration and also increase sound insulation.
Image credit: Moelven/Rune Abrahamsen