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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

Project in-detail

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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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
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