Travel
Hempcrete: The green brick taking on the challenge of climate change
Hempcrete is a bio-based building material helping to power the drive to net-zero, but how can a product developed a millennia ago help tackle today’s environmental challenges? Euronews Culture gets down and dirty with a material that has Europe’s eco-conscious architects high with excitement.
It really doesn’t look like much, but hempcrete is the green building material that’s got eco-savvy homeowners and architects excited by its potential to be a sustainable alternative to environmentally expensive bricks and concrete.
It is made using a carefully calibrated mixture of hemp shiv – the dried inner core of the hemp plant – mixed with lime and water.
But although hempcrete seems like a very modern building material, it has a history stretching back over 1,500 years.
Hemp plaster from the sixth century still lines the walls of the UNESCO-designated Ellora Caves in India, and hemp mortar has been discovered in ancient Merovingian bridge abutments in France – which is fitting, as France was at the forefront of the 1980s drive to modernise hempcrete and introduce it to a new generation.
Back then, wet hempcrete was cast onsite, as concrete is today, but the challenge of getting the mixture right made it a tricky product for laypeople to use. Too much of any of the three ingredients could make the material runny and weak, while not enough could cause crumbling.
Its drying time also posed problems. In fair conditions, cast hempcrete can take between four and six weeks to cure. But a cold damp winter could slow the process to at least six months, restricting its mass use across northern Europe.
Impeccable environmental credentials
Despite the challenges, hempcrete’s undeniable environmental credentials have meant it was a case of when, rather than if, it would muscle its way into the mainstream building trade.
Liam Donohoe, chief operating officer at UK Hempcrete – a Derbyshire-based company designing and supplying materials to building projects using hempcrete – tells Euronews Culture that sustainability plays a part in every area of the product’s development.
“Hemp, unlike conventional crops, doesn’t require a lot of fertilisers or pesticides to protect it as it grows. The type of fibrous hemp usually used in construction is a tall plant that grows quickly and so can be cropped and planted quite close together, naturally suppressing weeds,” he says.
“I’m not saying it takes no energy to produce hempcrete, it does. But when you compare it to man-made insulation and wall infills, it has an unlimited life span and the primary ingredient is a renewable crop that costs a lot less energy and carbon to produce.”
Research and development changed everything
Experiments in France and at Belgium’s University of Leuven in the early 2000s saw researchers begin tackling the barriers preventing hempcrete from realising its full potential as a mainstream building product.
The eureka moment was the development of the hempcrete block or ‘green brick’, which took the specialist skill and guesswork out of using the material.
The lightweight fibrous block opened up a new world of possibilities for the material without diminishing any of its eco-credentials. It is free from volatile organic compounds (VOC) and indefinitely retains its acoustic, moisture absorption and thermal conductivity properties – in sharp contrast to synthetic insulation that decompresses over time to become less effective.
It is now a consistent, lightweight and reliable product that can be easily transported to sites and used by jobbing builders without extensive training.
Hempcrete versus concrete
Despite its versatility, experts are quick to dismiss comparisons between hempcrete and concrete. Concrete is a reinforced, structural building material that can support its own weight, while hempcrete is used around a frame of wood, steel or concrete. Think of it as insulation that doesn’t cost the Earth.
“When hempcrete is made into blocks, it’s strong enough to support itself, so can be used to build multi-storey buildings. There are a number of examples in the Netherlands, South Africa and France, so it’s not that you can’t build high or strong structures with it, but you need to use it around a frame,” Donohoe says.
“Researchers are working on developing a structural application for hempcrete, but that currently means usually tweaking the recipe. The sweet spot is finding something that’s very consistent, that goes onto the building site just like any other building product, without compromising too much on the carbon inputs to the recipe by using ingredients that are less sustainably produced.”
Hempcrete’s time has come
Hempcrete is proving itself to be well-suited to the radically different way many lives are lived in the post-Covid world and the desire to do more to ensure the survival of the planet.
“In the recent past people would commute to their heated offices, do a day’s work and return home to put the heating on for an hour or two in the evening,” Donohoe says.
“We don’t live like that now. Increasingly a lot of us want a nice stable healthy environment at home, because that’s where many live and work.
“Synthetic insulations, such as polyurethane and fibreglass, form a barrier between heat and cold, but they heat-up and cool down very quickly. By contrast, natural materials, such as earth, or hempcrete, are a little slower initially to heat up, but they retain their heat a lot longer – a process called ‘decrement delay’. This process suits today’s world, where people are at home a lot longer, and the heating is on more frequently during the colder months,” he adds.
Europe is setting the pace in hempcrete use
The major players in the hempcrete world hail from Europe. In the Netherlands, France, Belgium, Germany and Italy, hempcrete is routinely used to retrofit old buildings and form the core of new builds.
One of the biggest producers is Belgian companyIsohemp. The Fernelmont-based business has been trading since 2011 and operates in five countries.
It produces more than a million hempcrete blocks a year and claims that the projects it has worked on have saved 18,000 tonnes of C02 from the environment – that’s equivalent to the emissions produced by a patrol car circumnavigating the planet 32,000 times.
Although the UK is a few steps behind the pack, the gap is closing fast. UK Hempcrete knows of 300 to 400 houses in the UK that have been built with hempcrete and sees a bright future for the product.
“The future of hempcrete will be in prefabrication using modular methods of construction. We already have timber-framed houses largely assembled in factories, brought to the site and constructed there. There’s no reason why hempcrete houses can’t be similarly prefabricated,” Donohue says.
“In Britain, companies are building conventional family homes with hempcrete that look just like estate homes anywhere in the country, but with vastly superior eco-performance benefits.
“A focus for us is retrofitting pre-1940s housing stock. We are working with community housing cooperatives around the country who have old houses that are cold and leaky. The biggest opportunity is developing that market alongside the growing newbuild market.”
But perhaps the full potential of hemp and hempcrete has yet to be realised. BMW currently use a weight-saving hemp polymer in the door panels of its i3 electric car, while in southern Italian earthquake zones hempcrete is used as a flexible building material that can cope with Earth movement, rather than rigid, brittle concrete.
The future of hempcrete as a green building material looks assured. But with researchers working on ever more innovative ways to use it, perhaps we’ve only seen a tantalising glimpse of the difference it can make.
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Travel
A 4-year cruise or a €1 house in Italy: Inside the schemes helping Americans skip Trump’s presidency
Searches by Americans for moving abroad soared in the 24 hours after the first polls closed, according to Google data.
Following the recent US election result, Google searches for ‘how to move to Europe’ increased by more than 1,000 per cent in some countries.
Searches by Americans for moving to Canada and Australia soared by 1,270 and 820 per cent respectively in the 24 hours after the first polls closed, according to Google data.
The interest in leaving the States has not gone unnoticed by marketing firms.
A residential cruise ship is now offering Americans a four-year ‘escape’ trip while a Sardinian village has relaunched its €1 house scheme.
Cruise company offers four-year escape from Trump
Cruise firm Villa Vie Residences is marketing a four-year round the world trip to Americans looking to skip Donald Trump’s second term as president.
The Tour La Vie programme offers passengers a stay of up to four years onboard while visiting 140 countries – which doesn’t include the US.
The irreverently named packages include a one-year ‘Escape from Reality’ cruise, a two-year ‘Mid-Term Selection’ option, a three-year ‘Everywhere but Home’ cruise, and the four-year ‘Skip Forward’ trip.
Guests would join the Villa Vie Odyssey, a residential cruise ship which set sail from Belfast in September, several months into its voyage.
“We came up with this marketing campaign before we even knew who would win. Regardless of who would have won, you would have half of the population upset,” CEO Mikael Petterson told US news site Newsweek.
“Quite frankly, we don’t have a political view one way or the other. We just wanted to give people who feel threatened to have a way to get out.”
Prices start at a little under $40,000 (€38,000) a year. For those opting for the full four-year escape, single-occupancy cabins start at $256,000 (€243,000) while double-occupancy costs up to $320,000 (€303,000).
The price includes all food and drinks (alcohol only at dinner), WiFi, medical visits, weekly housekeeping service and bi-weekly laundry.
Sardinian village relaunches €1 house scheme for Americans
In rural Sardinia, the village of Ollolai has revived its €1 house scheme, now targeting Americans exhausted by the election.
The homes-for-the-price-of-an-espresso offer has been relaunched for US citizens “worned [sic] out by global politics” and “looking to embrace a more balanced lifestyle”, local authorities write on the village’s website.
“Of course, we can’t specifically mention the name of one US president who just got elected, but we all know that he’s the one from whom many Americans want to get away from now and leave the country,” village mayor Francesco Columbo told US news site CNN.
“We have specifically created this website now to meet US post-elections relocation needs.”
Those needs include slowing down and recharging with Ollolai’s dreamy Mediterranean lifestyle.
“Nestled in pristine nature, surrounded by incredible cuisine, and immersed in a community with ancient traditions in the rare Earth’s Blue Zone, Ollolai is the perfect destination to reconnect, recharge and embrace a new way of life,” the website claims.
Available properties will soon be listed online with prices ranging from €1 for houses needing substantial renovations to €100,000 for those that are ready to live in.
This is not the first time the village in Sardinia has put houses for a pittance on the market. In a bid to halt a steep population decline, Ollolai began selling off abandoned homes in 2018 to people willing to carry out $25,000 (€24,000) of renovations within a three-year timespan.
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Catalonia has said they want to rid Barcelona of its 10,000 holiday lets in the next 5 years.
Catalonia’s recent ban on Airbnb-style holiday rentals breaches EU law, according to a complaint filed with the European Commission by an industry group.
The European Holiday Home Association claims that the ban, introduced by Catalonia in June this year, breaches the provision of services directive.
The Spanish region announced that they wanted to rid Barcelona of its 10,000 tourist flat licences over the next five years. The city has not granted new licences since 2014 but this has not helped to stem a housing crisis, with locals saying they can not find places to live at affordable prices.
Why has Barcelona’s Airbnb ban been challenged?
“We are convinced that EU law has not been respected,” Viktorija Molnar, Secretary General of the European Holiday Home Association (EHHA), said in a statement released on Wednesday.
“By submitting the EU complaint, we hope that the European Commission will take a step further and open a formal infringement procedure against Spain,” added Molnar, whose group represents short-term rental platforms like Airbnb and Expedia’s Vrbo.
The move follows legal concerns raised by the European Commission itself that restrictions brought in by the Spanish region were disproportionate to the aim of tackling housing shortages.
EHHA argues that “unjustified, disproportionate and unsuitable” restrictions breach the EU’s Services Directive, which regulates a swathe of activities from hotels to legal advice. They also said that claims about the impact of Airbnb on housing affordability are “politically inflamed”.
The lobby group may have support from the European Commission itself, whose officials wrote to Spanish authorities to protest the law in February according to a document seen by Euronews Travel.
“The Commission services consider that the restrictions laid down in [Catalonia’s] Decree-law 3/2023 are not suitable to attain the objective of fighting housing shortage and are disproportionate to that objective,” the document said.
Spanish authorities could have also considered less swingeing restrictions and hadn’t offered evidence that short-term rentals were responsible for housing market tensions, it added – noting that there were three times as many empty dwellings as tourist rental properties in Catalonia.
Barcelona is just one European holiday destinations trying to find ways to tackle overtourism.
Cities like Venice have banned cruise ships from stopping on their shores, Athens regularly restricts visitor numbers at the famous Acropolis and Amsterdam is moving its red light district out of the city centre to try and clean up its image.
How the European Commission is taking on holiday rentals
Brussels has already taken action to bring the sharing economy within the regulatory fold, offering new rights to platform workers and hiking value-added tax on short-term lets and ridesharing apps such as Uber.
But the issue could prove totemic for Commission President Ursula von der Leyen – who has created the first-ever European Commissioner for Housing as part of her second mandate, set to take office within weeks.
She has told Denmark’s Dan Jørgensen to “tackle systemic issues with short-term accommodation rentals”, in a mission letter that handed him the housing brief alongside responsibility for energy policy.
A spokesperson for the Catalan government did not immediately respond to a request for comment.
CORRECTION(20 November, 10:02): corrects spelling of Molnar’s name
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The move has been criticised by other tech companies who have branded Microsoft as being a “panic mode”.
In opening remarks to a company conference in the United States on Tuesday, Microsoft CEO Satya Nadella has set the stage for where the company is taking its artificial intelligence (AI) business.
AI developers are increasingly pitching the next wave of generative AI (GenAI) chatbots as AI “agents” that can do more useful things on people’s behalf.
But the cost of building and running AI tools is so high that more investors are questioning whether the technology’s promise is overblown.
Microsoft said last month that it’s preparing for a world where “every organisation will have a constellation of agents – ranging from simple prompt-and-response to fully autonomous”.
Microsoft elaborated in a blog post Tuesday that such autonomous agents “can operate around the clock to review and approve customer returns or go over shipping invoices to help businesses avoid costly supply-chain errors”.
Microsoft’s annual Ignite conference caters to its big business customers.
Microsoft criticised
The pivot toward so-called “agentic AI” comes as some users are seeing limits to the large language models behind chatbots like OpenAI’s ChatGPT, Google’s Gemini and Microsoft’s own Copilot.
Those systems work by predicting the most plausible next word in a sentence and are good at certain writing-based work tasks.
But tech companies have been working to build AI tools that are better at longer-range planning and reasoning so they can access the web or control computers and perform tasks on their own on a user’s behalf.
Salesforce CEO Marc Benioff has criticized Microsoft’s pivot. Salesforce also has its “Agentforce” service that uses AI in sales, marketing, and other tasks.
“Microsoft rebranding Copilot as ‘agents’? That’s panic mode,” Benioff said in a social media post last month. He went on to claim that Microsoft’s flagship AI assistant, called Copilot, is “a flop” that is inaccurate and spills corporate data.
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