[CTBUH] has verified the completion of Mjøstårnet, a mixed-use building in Brumunddal, Norway that now holds the unique title of the “World’s Tallest Timber Building.” At 85.4 meters, it is also the third-tallest building in Norway and the country’s tallest with mixed functions.
This news coincides with the amendment of the CTBUH Height Criteria – the official guidelines upon which tall buildings are measured – to include timber as a recognized structural material. — Council on Tall Buildings and Urban Habitat
The 18-story wooden structure Mjøstårnet (Mjøsa Tower) near Oslo, Norway popularly earned the title “World’s Tallest Timber Building” back in September 2018 when it structurally topped out. But it wasn’t until a recent update of the Council on Tall Buildings and Urban Habitat’s height criteria guidelines, that what truly constituted a ‘timber’ structural system was clearly defined.
The revised criteria for timber structures now requires that “both the main vertical/lateral structural elements and the floor spanning system must be constructed from timber. An ‘all-timber’ structure may include the use of localized non-timber connections between timber elements. A building of timber construction with a floor system of concrete planks, or concrete slab on top of timber beams, is still considered a ‘timber’ structure, as the concrete elements are not acting as the primary structure.”