Trying to revive wood skyscrapers

The idea of constructing high-rises out of wood and other sustainable materials may just be gathering steam:

This week, an ambitious proposal for the world’s tallest wooden skyscraper was unveiled in Vienna, Austria. The 275-foot, €60M timber building will be built next year, and follows in the low-carbon footsteps of recent timber structures in Canada, Australia, and England. The idea of fashioning tall towers from the earth’s natural materials, and not concrete or steel, first began gaining traction in 2013, when the Canadian architect Michael Green introduced the concept to the wider world via a TED talk that has now been viewed more than a million times. “I believe that wood is the most technologically advanced material I can build with,” Green said in his talk. “It just happens to be that Mother Nature holds the patent.”…

Unlike concrete and steel, synthetic materials that together represent eight percent of man’s greenhouse gas emissions, wood has the opposite effect: it takes in massive amounts of carbon dioxide, an obvious upside when cities are growing ever denser. “One cubic meter of wood will store one tonne of carbon dioxide,” Green explained in his TED talk…

At the time when Green gave his talk, the world was home to at least two existing timber structures that could have been considered towers: the Stadthaus residential building by Waugh Thistleton Architects in London, which has nine stories, and the Forté apartment complex in Melbourne, Australia, designed by Lend Lease developers with ten floors. Both buildings were made from panels of cross-laminated timber, which is a form of engineered wood that was originally developed as an alternative to stone and masonry. Unlike typical 2-by-4s, these panels made from many pieces of wood glued together are enormous, around eight feet wide and 64 feet long…It’s also fairly difficult to get cross-laminated timber to catch fire, which appears to be the main concern of supervisory bodies in cities where architects are attempting to use the material in their buildings. Vienna, which will soon have the tallest structure of this sort, has instructed its fire service to conduct special tests on the new building, which will already be required to install more sensitive sprinkler system than those required for other towers.

As the article notes, the main feature appears to be the reduction of carbon use compared to construction with cement and concrete. But, this might also draw the attention of architects less interested in the sustainability but intrigued by another medium with which to innovate. It could be fascinating to see the mix of mediums within a single skyline – imagine the glass skyscrapers of today next to wooden structures that have a entirely different feel.

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