The Council on Tall Buildings and Urban Habitat has dubbed the 85.4-meter Mjøstårnet, in Brumunddal, Norway, as the world’s tallest timber building. At the same time, the group amended the official guidelines to measure and rank building height – to recognize timber as a structural material. The update was prompted by the recent uptick of tall timber buildings currently under construction or in planning around the world. …According to the revised criteria, “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 hybrid 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.