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Bitumen Roof and Concrete Structure Embracing Nature in Iceland’s Hospitality Retreat

Author:
Sarah Magdalena Hopfner-heindl
Bitumen Roof and Concrete Structure Embracing Nature in Iceland’s Hospitality Retreat
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The incorporation of a green roof and the use of a bitumen insulating membrane in a concrete structure creates a sustainable retreat that fosters community interaction amidst Iceland's striking landscape.
5 key facts about this project
01
The guesthouse is designed with a green roof that integrates local flora.
02
A system of identical walls creates a cohesive and unified spatial experience.
03
The fireplace serves as a central social area, encouraging community interaction.
04
Hot tubs and bathtubs are strategically placed for direct views of the landscape.
05
A tapered concrete ceiling supports the green roof while enhancing structural integrity.

The Embedded Icelandic Thermal Springs Guesthouse is located in Iceland, where it connects closely with the unique landscape. The design centers on integrating with the natural environment, creating a building that blends into its surroundings. As a space for accommodation and social interaction, the guesthouse encourages a communal experience while providing guests with easy access to local scenery.

Design Concept
The concept focuses on embedding the building within the site. Inspired by nearby stone boulders, the guesthouse appears as a continuation of the landscape. The walls maintain a uniform design that gives a sense of coherence throughout the space. By strategically omitting some wall sections, the layout creates common areas that invite guests to gather, with the fireplace serving as a focal point for social activities.

Materials
A notable feature is the green roof, which references Icelandic architectural traditions. This roof not only enhances the building's environmental efficiency but also helps with insulation. The roof includes a bitumen insulating membrane composed of two layers, ensuring it is resistant to roots. The use of insulation and a vapor barrier further supports energy performance throughout the structure.

Amenities and Functionality
The building includes several amenities, such as hot tubs, bathtubs, and seating nooks, which are positioned to support a smooth flow between inside and outside. These features enrich the experience for guests, allowing them to enjoy relaxation and the beauty of nature. With these elements thoughtfully placed, visitors can engage more fully with their surroundings.

The tapered concrete ceiling supports the green roof and maintains the overall integrity of the guesthouse. This design detail enriches the building’s ecological focus while adhering to practical standards of construction and use.

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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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Competition organisers

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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