Concerns over carbon emissions caused by the construction process are fuelling a surge of interest in biobased materials.

Demand for biomaterials such as mycelium, hemp, algae, bamboo and cork is growing, Wurm said, as architects search for materials that store atmospheric carbon rather than emitting it.

“It’s a really exciting space,” Wurm told. There are a lot of startups and a lot of grants. There’s a lot of things happening.”

Demand is being fuelled by the realisation that around half of the total carbon emitted by a building is caused before it even opens.

“The big driver is the focus on whole-life carbon,” Wurm said. “The focus has shifted from making buildings energy-efficient to looking at carbon.”

Arup biomaterials

The built environment is responsible for an estimated 40 per cent of all greenhouse gas emissions but construction’s role has been overlooked until recently, Wurm said.

“For a long time, the construction industry was not a sector being addressed when we talked about climate change,” he said, pointing out that November’s COP26 climate conference will have a dedicated built-environment day for the first time.

In addition, the European Commission this week announced proposals that would limit emissions from buildings for the first time.

“So it’s now part of the overall discussion on climate change,” Wurm said.

Wurm leads the European research and innovation team at Arup, the global architecture and engineering group that is headquartered in London.

He has worked on pioneering biomaterial projects including a 2013 project that used algae to generate electricity and the 2014 Hy-Fi project at MoMA PS1 in New York, where he collaborated with Evocative Design to develop the mycelium bricks used to build a temporary tower designed by design studio The Living.

HY-Fi bio-brick building

More recently, he has collaborated with Italian biodesign firm Mogu to create a range of acoustic wall panels made of mycelium, which is the underground part of fungus. It feeds on waste biomass such as sawdust, absorbing carbon as it grows. It is increasingly being used for packaging, insulation and products.

Mogu produces a variety of biobased materials including mycelium acoustic panels and flooring products from bioresins and agricultural waste. The new system developed with Arup, called Foresta, was unveiled this week.

The Foresta product joins a growing range of experimental biomaterials being used in construction projects. Materials research lab Atelier Luma has added interior finishes made of algae, sunflowers and salt to The Tower, a building by Frank Gehry at Luma Foundation in Arles, France.

Practice Architecture worked with hemp farmer Steve Barron to build Flat House, a home in Cambridgeshire, England, that features insulation and external cladding made of the cannabis variety.

Colourful algae tiles

Matthew Barnett Howland, Dido Milne and Oliver Wilton used cork blocks to build Cork House in Berkshire, England, which was shortlisted for the Stirling Prize.

Bioplastic brand Made of Air has clad a car dealership in Germany with panels made from farm waste mixed with bioresin.

Wurm said these experimental materials are now going mainstream and architects consider using them on major projects.

“Focus is shifting to embodied carbon,” Wurm said. “Roughly over the whole life of a building, carbon emissions are 50 per cent embodied and 50 per cent operational.”

“The big driver is the focus on whole-life carbon,” Wurm said. “The focus has shifted from making buildings energy-efficient to looking at carbon.”

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The drive to create net-zero buildings that create no emissions over their entire lifecycle means that architects need to reduce embodied carbon, which includes all emissions generated by the manufacture of materials as well as the construction process itself.

Embodied carbon represents roughly half the carbon footprint of a building while operational carbon, which are emissions caused by the building in use, makes up the other half.

It’s much harder to tackle embodied carbon. Bringing these emissions down to zero is “impossible,” according to Hélène Chartier, head of zero-carbon development at international network C40 Cities.

Chartier, who is coordinating C40 Cities’ international competition to develop zero-carbon neighbourhoods, told that architects should reduce embodied emissions as far as they can and then look for ways of offsetting the remainder.

Hexchar facade by Made of Air at Audi Trudering dealership

Biomaterials that sequester carbon via photosynthesis offer an obvious way of reducing the upfront carbon footprint of a building. Timber is the most popular biobased material but “timber takes 100 years to grow,” Wurm said.

“So all the carbon we’re storing has been built up over 100 years,” when using timber, Wurm explained. “And we take down trees, which absorb quite a lot of carbon. Of course, we replant trees.”

“But I think it’s interesting to take the pressure away from forests and see what other materials we can use to capture carbon in a shorter time.”


And you? What do you think about biomaterials demand growing? Leave a comment below!

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