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Floating Timber Arches over Geothermal Fissures

Author:
Sean Lawler
Floating Timber Arches over Geothermal Fissures
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Floating above geothermal fissures, the combination of glue lam timber arches and lava rod supports creates a unique space that encourages both community interaction and personal reflection.
5 key facts about this project
01
Floating above the terrain, the structure utilizes glue lam timber arches for support.
02
Lava rod posts secure the design, anchoring it to the volcanic landscape.
03
The Troll Bridge features a sliding beam to accommodate geological shifts.
04
An open-air tower provides panoramic views of the surrounding fissures.
05
Multiple functional areas promote both community interaction and individual reflection.

CHASM is situated in the distinctive landscape of Grjótagjá, a fissure that lies between the continents of Eurasia and North America. The area is renowned for its thermal waters and rich folklore, featuring stories of trolls and Huldufólk. The design aims to blend the local mythology with the experience of visitors while promoting both community interaction and personal reflection. The overall concept emphasizes connectivity and the integration of architecture with the surrounding environment.

Design Concept

The idea behind CHASM focuses on using simple geometric forms to create a complex experience. The structure appears to hover above the volcanic rock, offering a floating effect that enhances the connection with the natural landscape. This elevation allows visitors to fully appreciate the views while exploring the varied spaces designed for both social engagement and quiet contemplation.

Structural Elements

The building relies on exposed glue lam timber arches for support. These arches provide both strength and visual interest, creating open areas that encourage interactions among visitors. To anchor the structure securely, lava rod posts are used, connecting the design to the unique geological features of the location. This method ensures stability and aligns the structure with the volcanic landscape.

Key Features

One unique element is the Troll Bridge, which spans the fissure and incorporates a sliding beam. This design allows for movements caused by geological changes while maintaining access for visitors. Additionally, the open-air tower acts as a lookout point, giving guests views of the stunning topography and showcasing the relationship between the natural and built environments.

Functional Spaces

CHASM includes various areas such as an atrium, dining facilities, and recreational spaces like a private spa and sauna. The arrangement of these spaces encourages movement and interaction while creating a welcoming atmosphere. Visitors can engage with the natural and cultural elements of Grjótagjá, as the design challenges traditional boundaries between indoor and outdoor spaces.

The design culminates in a gracefully curved observation tower. From this vantage point, visitors can take in the beauty of the fissures and geothermal features of the site, highlighting the connection between architecture and the vibrant landscape.

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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 €
Eligibility Open to all
Final registration deadline 30 October 2025

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