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Is going back to wood a terrible mistake? There are three main types. But the newest material is cross-laminated timber CLT , which is really starting to take off now. CLT is a true wonder material. The size of the panels is crucial. The first thing that happens is they char and that actually protects the wood beneath.
Cross-laminated timber is typically made from unwanted wood, such as the thin trees at the edges of forests or those killed by the mountain pine beetle Credit: Alamy. If you need a bit more reassurance, take a study by the Committee on Tall Wood Buildings earlier this year. The test was conducted at the Fire Research Laboratory, Virginia, a state-of-the-art facility that basically lets scientists set things on fire and then watch what happens.
When they set alight two one-bedroom apartments made of engineered wood, the fire raged until it had burnt through the furnishings, then extinguished itself. The contents were turned to ash, but the structure itself charred and remained intact. In this respect, the material wins hands down over steel and concrete, which tend to melt and weaken. As the tragedy at Grenfell tower showed earlier this year, fire resistance is even more of a challenge in tall buildings, which are harder for firefighters to reach.
According to Buchanan, this is one of the reasons wooden buildings typically tend to have fewer than 10 storeys. Right now the tallest is Brock Commons, a residential building at the University of British Columbia.
The lift shaft and stairwell is made of concrete, but all the beams and columns and floors are made of wood. Besides, lofty heights bring a range of other issues. The main concern for most skyscrapers is their sheer weight. These lateral forces have been plaguing skyscrapers for years and are the leading factor in their structural design. The heavier the building, the better. In strong winds, Trump Tower in New York had a nausea-inducing — but perfectly safe — amount of sway until it was reinforced with concrete columns in One way to overcome this in wooden buildings is to give them a concrete core, but some architects see this as cheating.
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