发布时间:2023-03-13 00:31:47 {{ caseViews }} {{ caseCollects }}

Architects:Henning Larsen

Area:250m²

Year:2023

Photographs:Rasmus Hjortshøj - COAST

General Engineering:Reeholm & Bredahl

Client:Feldballe School

Funding Partner:Realdania

General Contractor :Høgh & Sønberg

Supplier:EcoCocon

City:Feldballe

Country:Denmark

Text description provided by the architects. Designed for the climate crisis generation, the Danish school extension built of wood and straw is a scalable solution for carbon sequestering, giving the world a lesson in eco-innovation.

Driven by the commitment to design a building that captures more carbon than it emits, the 250m2 / 2700ft2 extension of Feldballe School in Rønde, Denmark, is Henning Larsen’s most ambitious project to date. Built for science classes for a generation that will come of age with the weight of the climate crisis, the architecture practice implemented an uncompromising material strategy; rethinking the conventional building blocks.

Embodying immense potential without compromising on function, atmosphere, and architectural expression, the school extension is built almost entirely of bio-based materials, viable alternatives to concrete, brick, and steel, and crucially, materials that sequester rather than emit CO2, are totally free of toxic chemicals, fire-safe, and offer both efficient insulation and a great indoor climate.

With support from the Danish philanthropic organization, Realdania, and in partnership with EcoCocon, the final design solution is a structure made of a pioneering panel system of compressed straw, a roof made solely of timber, and a ventilation system made of eelgrass - a common seaweed along seashores in the majority of the Northern Hemisphere.

Small in scale but big in impact. The project has redefined the standards for sustainable construction, examining the entire life cycle of a building. Part of eco-community Friland, the school’s goal of preparing a future generation of thinkers, leaders, and community members committed to creating a more sustainable world was a catalyst for the design ambition.

The design team created a framework for sustainable design that doesn’t exceed planetary boundaries, comprising five ambitious principles: incorporate sustainably sourced, renewable, bio-based materials to sequestering carbon; use already produced local materials to save resources and energy; employ materials that are free of toxic chemicals, minimizing off-gassing and ensuring clean production and processing procedures; lower operational energy consumption by ensuring a healthy indoor climate, fostering an environment that balances daylight with passive ventilation; design for disassembly, enabling the reuse of building components in the future.

Operationalizing these principles, the design team successfully surpassed the targets, arriving at a footprint of 6kg of CO2e per m2 per year, over a lifespan of 50 years – per Danish standards. Provided the space remains used and respected by the school community beyond the next few decades the footprint is reduced further to -3kg of CO2e per m2, per year*.

The integrated panel system of compressed straw in wooden cassettes was produced by partners EcoCocon with the utmost precision, forming a construction system that is adaptable and applicable to a vast range of building typologies. The roof is made entirely of certified locally produced timber, and untreated plywood makes up the inner walls' surfaces and the built-in furniture. The natural materials lend the extension a warm, welcoming expression, and because there is no need for large ventilation ducts or suspended ceilings, the rooms are spacious and high-ceilinged.

Natural and passive ventilation systems eliminate energy consumption on a daily operational level, further supported by solar panels on the roof. The permeable characteristics of straw allow humidity to escape, and the interior walls consist of clay plaster supporting its diffusion qualities. Air filters of eelgrass enable natural ventilation, automatically controlled by monitoring air quality and temperature.

The entire structure is designed for easy disassembly and reuse, prioritizing circularity and waste management, offering flexibility, and ease of repair, and making it possible to reinstall or recycle its parts in the future.

Project gallery

Project location

Address:8410 Feldballe, Denmark

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Feldballe School / Henning Larsen
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