Biochar kiln x Domaine de Boisbuchet

Pyrolysis kiln built for biochar production at Domaine de Boisbuchet (Lessac, France). Based on an open conical design, the kiln enables the transformation of organic waste into stable carbon through a simple and efficient combustion process. Biomass is added progressively, allowing the material to carbonise layer by layer while maintaining a clean flame, making the process both accessible and low-impact.

Conceived as both a production tool and an experimental infrastructure, the kiln supported the exploration of biochar as a material within regenerative practices. It established a direct link between organic waste, fire, and material transformation, foregrounding the potential of carbon as a resource rather than a by-product.

During the residency, the kiln was used to produce biochar that was later combined with earth and straw, drawing from principles of traditional cob construction. This resulted in an archive of unfired material samples with potential applications in carbon-negative construction, offering thermal insulation and humidity regulation properties. As a reversible material system, these composites can be reintegrated into the soil once their purpose has been fulfilled.

At Boisbuchet, a site dedicated to experimentation at the intersection of design, architecture, and craft, the kiln operates as a shared infrastructure for collective learning and material inquiry.

Commissioned by
Domaine de Boisbuchet

Concept, Design & Production
Carla Alcalà

Supported by
Acción Cultural Española

Carla Alcalà Badias

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