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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 Next House: USA — A Global Call to Reimagine the American Suburb

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Competition organisers

Buildner is launching The Next House: USA, a global architecture competition that challenges architects, designers, and thinkers to reimagine the American suburban home for the 21st century. For decades, the suburban house has symbolized comfort and stability, but today it often reflects excess, isolation, and environmental strain. This competition asks: how can the American home evolve to address climate urgency, economic pressures, and shifting social values?

Participants are tasked with designing a prototype home of no more than 1,500 sq ft (≈140 m²) for a household of two adults and one child. The design should be compact yet generous, adaptable, sustainable, affordable, and replicable across diverse U.S. contexts. More than a design exercise, the competition aims to spark a conversation about how homes can support healthier, smarter, and more connected communities.

The total prize fund is $20,000 USD. The final registration deadline is May 20, 2026, and winners will be announced on September 22, 2026. The Next House: USA invites architects, students, and visionaries worldwide to redefine what the American home means today—and what it should mean tomorrow.

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Design the next suburban home for the USA

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Early bird registration deadline 19 November 2025

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