Episode 52. AJ Climate Champions with Hattie Hartman and Joe Jack Williams.

To achieve replication at scale, Nicolas Coeckelberghs of Brussels-based BC Materials favours compressed earth blocks over rammed earth.

‘Our goal is to bring earthen construction from a niche to a growing market,’ says Coeckelberghs. He likens this challenge to playing chess on multiple fronts, creating demand while simultaneously supplying the market. While acknowledging the aesthetic appeal of rammed earth, Coeckelberghs cautions that it is technically complex and unaffordable at scale.

In this episode, Coeckelberghs describes BC Architects’ 15-year trajectory from its first earth building in Burundi, to the proliferation of collaborative workshops which led to a strand of consultancy work, to the creation of cooperative BC Materials in 2018. This led in turn to the recent launch of Léém, a manufacturing company that produces circular materials: unfired bricks, and clay plasters and paints.

While Coeckelberghs is an innovator, he is also pragmatic and advocates focusing on easy wins. ‘Don’t use earth to make facades, just use it to make structures inside,’ he says. He sees enormous scope for application of earth blocks internally where they are protected from the weather and hence more durable.

In search of a way to scale the earth blocks production, BC Materials visited concrete and brick manufacturers across Belgium to understand their manufacturing techniques and explore possibilities for collaboration. Partnerships with large manufacturers are now underway, and BC Materials produces its blocks through ‘industrial co-working’, using the larger plants’ production line during their ‘off’ hours.

For show notes and to catch up on all AJ Climate Champions episodes, click here.

Episode 51. AJ Climate Champions with Hattie Hartman and Joe Jack Williams.

Daniel views mud and waste as opportunities, not obstacles. He advocates an approach of ‘maximum optimism’, explaining that mud and waste enhance his designs. ‘I follow the materials; they do not follow me,’ he says.

Sourcing materials primarily from within five miles of a site, Daniel describes how mud and waste can be transformed into beautiful buildings. But this was not the case from the outset. Daniel first incorporated waste bottles into an early project because the budget ran out before the windows had been purchased. He then realised that a new aesthetic had emerged from this approach.

Daniel argues that architects need to be on site, not in the office, in order to observe their surroundings. ‘Open your eyes. Be out there!’ he advises. Architecture is not a white collar job; it’s about going to site, according to Daniel. ‘Today architects are not able to see because we are simply oblivious to what is happening around us. This way of practice has to change,’ he insists.

Daniel’s ambition is to bring earth construction to the mainstream and he is not opposed to adding small amounts of cement to his earth mixes to increase structural strength. ‘We need to enter commercial construction. If that means using a bit more steel or cement than the purest form of mud architecture, I’m open to it,’ he says.

For show notes and to catch up on all AJ Climate Champions episodes, click here.

Episode 50. AJ Climate Champions with Hattie Hartman and Joe Jack Williams.

Carmody Groarke sustainability lead Sian Ricketts explains how architecture can adapt to the reality of finite resources and an abundance of waste.

Ricketts says that architects should develop their intuition and new rules of thumb to design for a changing climate. Architecture needs to adapt to incorporate materials from waste streams, and this requires a new approach to detailing and ongoing maintenance. ‘The industry is going through a huge learning process and we should not be scared of getting it wrong,’ she says. Marginal gains on every project are important.

In this episode, Ricketts describes the process of developing a bespoke brick for the Design Museum Gent in Belgium. She explains that the practice did not start with a bespoke brick in mind. Because conventional clay-fired bricks are high in embodied carbon, an exploration of less carbon intensive alternatives led to an in depth collaboration with Local Works Studio and Brussels-based bcmaterials that in turn led to incorporating local waste streams into the design of the new brick.

Ricketts observes that the process of developing the bespoke brick for Ghent has strengthened the practice’s confidence in seeking opportunities for both innovation and circularity in future projects. Carmody Groarke is currently working with Imperial College-based startup Seratech to explore the use of magnesium carbonate as a binder for bricks.

For show notes and to catch up on all AJ Climate Champions episodes, click here.