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Basalt Cladding and Etfe Roof Overlooking Hverfjall: a Sustainable Educational Hub

Authors:
Kevin Loewen, Kenny Li, Brent Lauman
Basalt Cladding and Etfe Roof Overlooking Hverfjall: a Sustainable Educational Hub
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With basalt cladding and an ETFE membrane roof that captures natural light, the design creates a productive greenhouse and educational space that harmonizes with the landscape around Hverfjall.
5 key facts about this project
01
Basalt cladding mirrors the local geological features.
02
Rooftop greenhouse maximizes sunlight for sustainable growth.
03
Stormwater collection systems irrigate hydroponic crops.
04
Central courtyard fosters interaction and learning experiences.
05
Extensive glazing frames views of the Hverfjall volcano.

The design is set against the impressive backdrop of the Hverfjall volcano and Mývatn natural baths in Iceland. It serves multiple functions, including educational activities related to sustainable agriculture and dining experiences. The concept focuses on blending the built environment with the natural landscape. It encourages visitors to engage with the site through paths that follow the natural topography.

Design Concept
The design features a flow of natural and built elements that encourages a connection with the surrounding landscape. Ramps guide visitors along a gently inclined surface, enhancing their experience and spatial awareness of the area. The roof slopes down to follow the land, creating a visual connection between the architecture and the natural environment.

Central Courtyard
In the center lies a courtyard that connects crucial areas, including a two-storey greenhouse. This courtyard acts as a hub for movement and interaction. Guests can immerse themselves in learning about natural systems while exploring the productive landscape. The greenhouse positioned on the rooftop maximizes sun exposure, making it an inviting space for visitors while supporting plant growth.

Sustainable Systems
A noteworthy aspect of the building is its sustainable approach to water management. Stormwater is collected from the roof and used for irrigation in hydroponic systems. This method not only promotes sustainability but also demonstrates a responsible use of resources.

Materiality
The materials used in the construction significantly contribute to the design's context. Black basalt stone cladding mirrors the local geography, helping to ground the structure in its environment. Glass and aluminum elements add transparency, allowing natural light to flood in and creating a connection to the outside. In the greenhouse, an ethylene-tetrafluoroethylene (ETFE) membrane is used, allowing for abundant light while minimizing energy use.

Large windows throughout the building frame scenic views of the volcanic landscape. This feature enhances the feeling of being part of the natural surroundings, creating a calm atmosphere inside.

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The Buildner’s Unbuilt Award 2025: Celebrating Architectural Creativity and Visionary Unbuilt Designs with a Total Prize Fund of €100,000

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The Buildner’s Unbuilt Award 2025 is an international architecture competition dedicated to recognizing and celebrating the value of unrealized architectural designs. It invites architects, designers, and students worldwide to submit visionary projects that have not yet been constructed, highlighting the power of ideas and the creativity behind the design process. By focusing on unbuilt work, the competition aims to bring forward concepts that shape the future of architecture and push the boundaries of the profession. 

Participants can compete in three categories based on project scale: Small Wonders (up to 100 m²), Medium Marvels (101–999 m²), and Large Visions (over 1,000 m²). Each category winner will receive €20,000, and additional prizes include honorable mentions, student awards, and a special Best Presentation Award. Winning projects will gain significant international exposure through Buildner’s publicity campaign and a feature article on ArchDaily, providing a unique opportunity to showcase creative ideas to a global audience. 

The Buildner’s Unbuilt Award 2025 encourages entrants to submit any type of unbuilt project, from conceptual visions to detailed designs, celebrating bold innovation without the constraints of realization. Important deadlines: registration closes on October 30, 2025; submissions are due by November 20, 2025; winners will be announced on December 17, 2025.

Buildner's Unbuilt Award 2025

Celebrating your unbuilt architecture visions with a €100,000 prize

100,000€ Prize / 2025 ideas COMPETITION
Prize 100,000 €
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Final registration deadline 30 October 2025

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