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Rainwater Harvesting Through a Zinc Facade and Thermal Stone Wall Micro House

Authors:
Nicolás Caldera Gutiérrez, Miguel Benedito Cadórniga
Rainwater Harvesting Through a Zinc Facade and Thermal Stone Wall Micro House
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A thermal stone wall and zinc façade enable efficient rainwater harvesting in a micro house designed for sustainable living in Galicia, providing essential services while integrating with the surrounding landscape.
5 key facts about this project
01
Rainwater collection system integrated into the sloped roof for self-sufficiency.
02
Reused thermal inertia wall enhances energy efficiency while preserving local heritage.
03
Zinc façade provides durability and complements the surrounding landscape.
04
Three strategic contact points elevate the design above ground for optimal drainage.
05
Natural ventilation is facilitated by an automated grid in the solar chimney.

The micro house project offers a practical living solution designed for individual needs, located within the scenic region of Galicia, northern Spain. The design emphasizes self-sufficiency and sustainability, catering to residents who prefer a closer connection to nature as they adapt to new work patterns. Functionality is central to the concept, with a focus on maximizing space efficiency while ensuring comfort and ease of use.

Design and Functionality

At the heart of the micro house is an approach grounded in thermodynamic principles. The building features an elevated floor that is supported by three critical contact points. These include a dedicated service area with a kitchen, bathroom, and shower, all designed with independent drainage systems. A reused thermal inertia wall is a key feature, providing effective insulation against temperature fluctuations and contributing to the overall energy efficiency of the home. A chimney aids natural ventilation, ensuring a pleasant indoor environment.

Sustainability Features

Sustainability is a crucial element in the design. The stone wall acts as an important structural component, helping manage thermal comfort within the space. During warmer months, nearby deciduous trees offer shade that prevents overheating. Warm air rises and is expelled through an automated grid in the chimney, promoting air circulation and regulating temperature. In winter, the wall absorbs solar heat and gradually releases it, which keeps the indoor climate stable and comfortable throughout the night.

Integration of Local Context

The project connects closely with its geographical and cultural context. By reusing materials from abandoned buildings in the area, the design respects local history while addressing contemporary needs. The incorporation of coarse walls is not only functional but also enhances the aesthetic appeal. This approach highlights a commitment to sustainability while staying true to regional architectural traditions.

Water Management System

A rainwater collection system reduces reliance on external sources. The roof's slope directs rainwater into a storage tank beneath the house. This system allows for the harvested water to be used for various purposes, including generating electricity through the REGN system, promoting an eco-friendly lifestyle.

The design pays attention to detail with the use of materials like zinc for both the façade and rain gutter. These choices ensure durability and contribute to visual harmony. Proper insulation and vapor barriers within the metal framework enhance the home’s thermal performance. The design effectively combines modern living requirements with respect for the natural surroundings, resulting in a thoughtful living environment.

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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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