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Pumice Walls Crafted at the Intersection of Tectonic Plates

Authors:
Micah Sexton, Emily Sexton
Pumice Walls Crafted at the Intersection of Tectonic Plates

Project in-detail

Constructed with pumice walls at the tectonic intersection of Eurasia and North America, the tower serves as a visitor center that enhances engagement with the geothermal landscape of Grjótagjá.
5 key facts about this project
01
Constructed directly on the fault line between the Eurasian and North American tectonic plates.
02
Utilizes pumice-based concrete for both structural integrity and ecological sensitivity.
03
Includes a private bath cave that integrates with the natural geothermal landscape.
04
Features a multi-functional visitor center with an observation deck overlooking geothermal pools.
05
Incorporates interpretive signage to educate visitors about the site's geological history.

The Iceland Cave Tower is located at Grjótagjá, a site known for its unique geological features like volcanic rock and geothermal pools. Positioned along the fault line between the Eurasian and North American tectonic plates, the tower serves as a monument that represents the connection of these two landmasses. The design highlights a relationship with nature, inviting visitors to experience the landscape while providing essential services.

Architectural Concept

The design focuses on the geological context of the site. The tower acts as a central point that encourages exploration and interaction with the geothermal features beneath it. The form reflects the earth's elements and the geography around, creating a space that resonates with the natural forces at play.

Functional Layout

Visitor facilities are incorporated into the design, including restrooms, a visitor center, an observation deck, a café, and a private bath cave. This layout addresses the practical needs of visitors while enhancing their connection to the surrounding landscape. The visitor center serves as an information hub, positioned to provide outdoor seating that offers views of the geological formations, allowing patrons to enjoy both the architecture and the scenery.

Materiality and Construction

Pumice-based concrete was chosen for the tower's construction, demonstrating a focus on durability and ecological considerations. The overlapping scale walls add structural strength while echoing the natural shapes in the environment. This material choice reflects a commitment to sustainability and an awareness of the site's characteristics.

Design Details

Careful planning has gone into the circulation paths that allow visitors to navigate the site. These paths guide visitors while featuring interpretative signage that explains the history and formation of Grjótagjá. This approach creates a narrative that connects the building to its geological context, enhancing the visitor experience. The design underscores the importance of the geothermal pools, focusing on both engagement and education through the architecture.

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MICROHOME 10: Celebrating Small-Scale Living with €100,000 Prize Fund and Kingspan’s Innovation

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Competition organisers

The MICROHOME 10 competition invites participants to submit visionary designs for off-grid, modular microhomes that push the limits of sustainable, small-scale living. Organised by Buildner in partnership with Kingspan and Hapi Homes, this tenth edition sets the challenge of designing a dwelling for two people within a maximum floor area of 25 m², encouraging bold solutions adaptable to any urban or rural location. The competition continues Buildner’s mission to foster innovative approaches to compact, energy-efficient housing that can address pressing global challenges.

This year’s edition offers a generous total prize fund of €100,000, including the Kingspan Award for designs that integrate high-performance Kingspan products and the Hapi Homes Award for a project selected for real-world construction. In addition to cash prizes, the winners gain international exposure through Buildner’s media partnerships, publications, and a dedicated MICROHOME magazine, further amplifying their ideas to the wider architectural community.

Key dates for MICROHOME 10 include the closing date for registration on 25 September 2025, the submission deadline on 29 October 2025 (11:59 p.m. London time), and the announcement of winners on 9 December 2025. These milestones ensure participants have clear timelines to develop and present their concepts, with early registration discounts available to support students and emerging designers worldwide.

MICROHOME

Design a new small-scale home concept in the 10th edition of MICROHOME — 100,000 € prize + construction

100,000 € Prize Fund / Kingpsan Edition #10 ideas COMPETITION
Prize 100,000 € + Potential realisation
Eligibility Open to all
Final registration deadline 25 September 2025

Enter an open architecture
competition now

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