The Guardian has a new feature on Resilient Cities and looks at a subject dear to this TreeHugger's heart, wooden buildings. They make so much sense right now, with square miles of pine-beetle infested wood that will rot where it stands if not turned into something. Now it can be turned into Cross-Laminated Timber (CLT) sort of plywood on steroids and used to build mid-rise to high-rise towers, nicknamed "plyscrapers."
Athlyn Cathcart-Keays covers much of the same turf trod on TreeHugger, starting with Vancouver architect Michael Green, who tells the Guardian why wood construction is so important, asking architects...
to branch out beyond their concrete and steel confinements, and embrace a material that sequesters carbon dioxide from the atmosphere, holding it captive during its growth and lifetime in a structure – one tonne of CO2 per cubic metre of wood. To put that in context, while a 20-storey wooden building sequesters about 3,100 tonnes of carbon, the equivalent-sized concrete building pumps out 1,200 tonnes. That net difference of 4,300 tonnes is the equivalent of removing 900 cars from the city for a year.
More on Michael Green in TreeHugger:
Architect Michael Green Calls Wood "The Most Technologically Advanced Building Material In The World."
Michael Green is building North America's tallest wood building in Prince George, BC
Tall Wood: Architect Gives Away Technology To Build Wood Buildings Thirty Storeys High
She also mentions the Forte Building in Australia, covered here.
In New Zealand, architects are hugging wood as "a desirable and safe alternative" to concrete and masonry in an earthquake zone. It's lighter, more flexible and yes, it's fireproof; heavy timber develops a protective char when exposed to fire, and is engineered to be larger than needed to allow for this. So don't read the comments. They are using some interesting new technology:
The structure uses a “post-tension” technology – the brainchild of Buchanan and his colleagues – where timber is lashed together with steel tendons that act like rubber bands, allowing the building to snap back into place following any seismic movement.
Back in Canada, the big news is that wood construction is now approved for up to six storeys high in Ontario, just like it is in British Columbia. This is really important, as it makes the redevelopment of Main Streets throughout the city economically viable; they have been stuck for years in the face of high parking requirements and the cost of concrete construction; six storey wood could create a huge new supply of affordable housing.
More in the Guardian.
Time to update last year's slideshow!