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Rammed Earth Walls and Evaporative Cooling in a Community-Focused Residence

Author:
Vita Attrill
Rammed Earth Walls and Evaporative Cooling in a Community-Focused Residence

Project in-detail

Rammed earth walls and a butterfly-shaped roof optimize natural ventilation while reducing heat gain, creating a sustainable residence that fosters community interaction in rural Queensland.
5 key facts about this project
01
Rammed earth construction maximizes thermal mass for energy efficiency.
02
A butterfly-shaped roof enhances natural ventilation and solar harvesting.
03
The sunken floor design integrates seating and promotes social interaction.
04
Rainwater harvesting systems support sustainable water management.
05
Strategic openings facilitate cooling breezes, reducing reliance on mechanical systems.

The design located in Charters Towers, Queensland, responds to the challenges posed by the local climate and the need for community connection in a rural setting. It aims to create a living space that balances comfort and sustainability. By focusing on heat mitigation and promoting social interaction, the design taps into the essence of rural life while addressing contemporary needs.

Heat Mitigation Strategies

A key feature is the butterfly-shaped roof, which plays an essential role in keeping the interior cool. This design allows hot air to escape through clerestory openings, improving natural ventilation. Additionally, the 2.5-meter overhang protects the exterior walls from direct sunlight, effectively reducing heat gain during the summer months. This focus on thermal comfort is particularly important in an area known for its high temperatures and humidity.

Thermal Performance

The sunken floor enhances the building's thermal performance by maximizing the advantages of thermal mass. Using rammed earth as a primary material allows the structure to maintain stable temperatures throughout the year. This choice not only helps in energy efficiency but also contributes to a comfortable living environment. When combined with local clay tiles, the design further improves thermal properties while maintaining an earthy aesthetic.

Natural Ventilation and Social Spaces

Natural ventilation is another important aspect of the design. The arrangement of openings invites prevailing breezes to flow through the space. By incorporating a wind funnel, the design effectively directs airflow over water features, promoting evaporative cooling. The layout emphasizes social spaces, with the sunken floor serving as functional seating that encourages interaction among residents, addressing the isolation often felt in rural communities.

Water Management and Sustainability

Efficient water management is integrated into the design, which includes rainwater harvesting and grey water recycling systems. These practices significantly decrease water use and enhance sustainability. By focusing on responsible resource management, the design supports the needs of its occupants while minimizing its environmental impact.

The overall result is a blend of practical living space and environmental awareness. The rammed earth walls not only provide thermal mass but also create areas for seating, promoting community and connection within the home.

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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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