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 Post subject: The rise of wooden skyscrapers
PostPosted: Tue Apr 10, 2018 11:39 pm 
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http://www.dw.com/en/the-rise-of-wooden ... a-43267745

Quote:
SUSTAINABILITY

The rise of wooden skyscrapers


Date 10.04.2018
Author Karin Jäger (im)

Forget steel and concrete — wood is the latest go-to material for building skyscrapers. The renewable resource has high potential.

Image

"The world's tallest wooden house!" reads a huge poster on the side of a building under construction in the Norwegian municipality of Brummundal.

The house doesn't have any scaffolding; cranes and an outdoor elevator are used to transport the building material to where it's needed. The wood is sourced from Norwegian forests.

When it's finished in March 2019, the wooden house will be 81 meters (265 feet) tall, and will have 18 stories with 27 apartments that ranging from 67 to 149 square meters (720 to 1,600 square feet) as well as a swimming pool, a hotel, offices and restaurants.

Timber skyscrapers: an international trend?

But despite the declaration on the poster, this is not actually the world's tallest wooden house after all. Vienna is currently working on an 84-meter-tall wooden building 24 stories tall (with a staircase made out of cement).

The building in Vienna will also combine apartments with offices, shops and a spa.

Ask the Austrians and they will tell you they're the ones who came up with the concept of using wood as an industrial product. Austria is the world's largest producer of cross-laminated timber.

And though that may sound unsustainable, it's done under the number-one rule of Austria's lumber industry: Never log more than can grow back.

Read more: Wood: Renewable construction material of the future?

In the Parisian district of Terne, an entire building complex is being built from cross-laminated timber and glass.

The rooftops of the structures — which will be nine stories tall — will be accessible to the public, and are supposed to encourage citizens to engage in urban gardening.

In Germany, an eight-story wooden house was built on an area that used to belong to the United States army in the Bavarian town of Bad Aibling. It is a current showpiece for energy-efficient construction.

Image

'Wooden buildings aren't profitable yet'

Berlin architects Kaden+Lager are building Germany's tallest building, the Skaio building in Heilbronn, using mostly wood. It will have 10 stories and be 34 meters tall.

Renowned architect Tom Kaden told German magazine Das Haus that he wants to make wooden houses affordable for everyone. That's why he uses metal rather than wooden nails. It's all about making the most of each material, he says.

Kaden teaches architecture and wooden construction at a university in Austria. There aren't more wooden houses yet because every architect and every carpenter has to create new models every time. This is not efficient, he points out.

"Today, we have hundreds of different ways of building timber houses. That's not profitable."

What's more, local planning and building laws often limit construction with wood. Germany has no country-wide regulations yet, and often individual permits are necessary, which are time-intensive and costly.

It's not surprising then that projects for the most spectacular wooden buildings only exist on paper so far.

Environmentally friendly alternative

Architects and researchers at the University of Cambridge created a concept for London's first wooden skyscraper. The wooden frame of the 80-story-high "Oakwood Towers" is supposed to rise 300 meters into the sky.

"Using wood as a construction material could change the way we build in this city," says architect Kevin Flanagan. "Wooden houses have the potential to create a more visually appealing, relaxing and creative experience."

A wooden high-rise planned for Tokyo will stand at 70 stories and 350 meters tall.

Ever more people are moving into cities. By using wood as a construction material for houses, nature can re-enter urban spaces.

And wood can be an environmentally friendly choice as well. Wood is a renewable resource — it grows back after being logged — and growing trees remove the greenhouse gas CO2 from the atmosphere.

Read more: Bioeconomy: A global trend?

As long as a wooden building stands, that carbon dioxide is locked away from contributing to climate change.

What's more, wood-based materials use less energy to create compared to steel or cement. And even thin wooden walls suppress sound.

The fact that wooden buildings are becoming increasingly taller and more extensive is due to the possibilities inherent in the original raw material.

Plywoods and laminated veneer can be glued together in order to form several layers at right angles to one another. Cross-laminated timber is easy to process, very stable across dimensions, and can transfer its load both lengthwise and crosswise.

Wooden elements can be used in construction of detached and semi-detached houses, multi-story housing, schools, commercial, religious, and industrial buildings for the roof, ceiling and wall components.

Whole sections can be pre-made and erected quickly on-site. Due to the relative strength and lightness of the wood, it is also suitable for closing gaps, or construction projects on existing buildings.

Some structures are quite spectacular, such as the wooden dome of the elephant house in the Zurich Zoo.

Long-lasting and fire-resistant

Resistance to earthquakes is another advantage of building with wood. With regard to fire safety, architect Tom Kaden refutes claims wood can be dangerous.

"Every well-trained firefighter knows today that an adequate solid wood construction made from cross-laminated timber will withstand fire long enough for them to rescue the residents," he told DW.

"At the end of its life, a wooden house will still be easy to recycle," he added.

The wood-building community of Frickingen is not building up, but rather out. For 30 years, the municipality has been using silver firs from local forests, and has since become a leader in climate protection in Germany.

At the beginning, however, architect Manfred Fetscher had to fight for his projects.

"In terms of prices, ours were significantly lower than those of our competitors who do not build with wood," he told DW. "We were obviously too cheap, which seemed suspicious to the clients."

Today, everyone is thrilled with the individual buildings, says Frickingen Mayor Jürgen Stukle.

"They have charm and flair — even after 30 years — and so far we have had almost no costs for the renovations."


Quote:
With regard to fire safety, architect Tom Kaden refutes claims wood can be dangerous.

"Every well-trained firefighter knows today that an adequate solid wood construction made from cross-laminated timber will withstand fire long enough for them to rescue the residents," he told DW.


Well, I am a bit more sceptical regarding this.

I grew up in Chicago.....we learned in our history classes about a city made of wooden structures:

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Wed Apr 11, 2018 9:31 am 
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Their are probably a few folks in Japan, or maybe a few old Army Air Corps B-29 pilots, that can tell you about the folly of building everything out of wood as well.

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Wed Apr 11, 2018 9:38 am 
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nelmsm wrote:
Their are probably a few folks in Japan, or maybe a few old Army Air Corps B-29 pilots, that can tell you about the folly of building everything out of wood as well.


:lol: Yeah, Curtis Le May.

I don't believe for a second the INTERIOR of a 21st century 18 story building has no steel. Weight bearing corner supports..steel. Elevator shaft..steel. Stairway supports...steel. Main cross members at least on the lower floors..steel. Fire doors...steel. Joists, vertical framing, exterior...sure that could be wood.

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Thu Apr 12, 2018 1:46 pm 
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Setting up the world for another incendiary carpet bombing event.

Part of the sustainable approach is that we reuse everything, including World Wars and strategies employed in them. This way we won't have to come up with new expensive and wasteful things like space fleets and such when we can just use old prop planes to drop tonnes of incendiaries on wooden cities. Perhaps we could have the props driven by solar panels or better yet, we could focus sunlight into a coherent energetic beam and burn the cities without the wasteful production of tonnes of petrochemical weapons.

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Thu Apr 12, 2018 1:50 pm 
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Even the concrete steel skyscrapers are death traps when they catch fire and they do so surprisingly often - at least they rarely spread the fire to surrounding buildings and even within the concrete slabs sort of slow it all down a bit as they will never actually catch fire or feed the fire.

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Fri Apr 13, 2018 5:14 pm 
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"Suzanna, :+: hands her the binocs :+: look closely.

WHAT DO YOU WANT ME TO SEE, ROLAND?

do you think they're made of wood?

I THINK SO

not made of something else facade, to fool someone who might want to burn it down?

ROLAND, I REALLY THINK IT'S MADE OF WOOD.

ok then. ..

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Fri Apr 13, 2018 5:25 pm 
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Not a wood house. ;)

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 Post subject: Re: The rise of wooden skyscrapers
PostPosted: Fri Apr 13, 2018 6:40 pm 
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nero wrote:


Not a wood house. ;)


That building was poorly designed: it had no fire sprinklers inside the building and it also had only one stairway inside the building.

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