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Pressed Straw Insulation and Rainwater Harvesting in a Compact Residential System

Authors:
Paolo Stefanoni, Alfredo Scardina, Katia Vitello
Pressed Straw Insulation and Rainwater Harvesting in a Compact Residential System
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Utilizing pressed straw for insulation and a comprehensive rainwater harvesting system, the design prioritizes sustainability within a compact residential layout.
5 key facts about this project
01
Utilizes dry composting toilets to minimize water usage.
02
Incorporates a rainwater harvesting system for irrigation and washing.
03
Features pressed straw insulation for enhanced energy efficiency.
04
Designed with a large south-facing glass wall for passive solar gain.
05
Includes modular elements allowing for future adaptability within the space.

The design project titled "Dejamais vu" offers a thoughtful exploration of sustainable living. It addresses environmental and social concerns through a contemporary framework. Set in a context that prioritizes efficient use of space, the project blends residential functionality with an emphasis on flexibility. It incorporates established techniques and systems that are not yet widely utilized, resulting in a living space that balances communal interaction with individual privacy.

Water Management

A significant aspect of the design is its innovative approach to water management. Water is employed for essential functions like sanitation and washing, with a specific focus on a dry composting toilet system. Rainwater is collected from the roof and stored for later use in irrigation and other practical applications. This approach highlights two operational scenarios: the standard version connects to the urban water network, while the independent option uses a well water supply, supplemented by methods for generating water in areas with low rainfall.

Energy Efficiency

The project emphasizes energy efficiency throughout its design. Solar energy is harvested through hybrid solar panels, optimizing overall energy usage. The building minimizes consumption by using LED lighting and carefully selected energy-efficient appliances. In the standard version, access to the public electricity grid allows for potential net metering, which benefits the user. The independent variant, on the other hand, makes use of a hydrogen storage system to ensure that it can operate without external energy sources.

Structural Design

The structural makeup of the building incorporates a wooden platform frame set on a stone foundation, blending traditional elements with modern techniques. Designed with passive house principles in mind, the building features a large glass wall facing south to take advantage of natural light and heat. A technical room located to the north supports the loft bed slab and is designed according to Feng Shui principles. The exterior load-bearing walls are built to be 50 cm thick, using pressed straw for insulation, which enhances the building's energy efficiency.

Waste Management

An effective waste management system is also present in the design. Human waste is handled through a dry composting method, while organic waste, such as food scraps and garden refuse, is gathered in designated containers. These containers are placed at a distance from living areas to promote hygiene. There are additional waste receptacles located near the road to facilitate proper disposal, which supports the project’s overall environmental responsibility.

Overall, the thoughtful integration of various systems for resource management reflects a commitment to efficient living. The design creates a cohesive environment that balances modern convenience with ecological mindfulness, catering to the needs of its inhabitants while respecting the surrounding context.

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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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