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Rainwater-Capturing Wall Featuring Hempcrete and Cross-Laminated Timber for Sustainable Living

Authors:
Sheena Gary, Surani Gunawardana, Carlos Montes
Rainwater-Capturing Wall Featuring Hempcrete and Cross-Laminated Timber for Sustainable Living
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A vertical concrete rainwater wall, integrated with a wind turbine and built using hempcrete and cross-laminated timber, serves as the backbone of this microhome designed for sustainable living.
5 key facts about this project
01
Vertical rainwater wall integrates wind turbine for energy generation.
02
Liquid desiccant waterfall regulates indoor humidity naturally.
03
Private spaces are elevated to enhance privacy within limited footprints.
04
Materials include hempcrete and cross-laminated timber for sustainability.
05
Biogas system turns waste into energy for cooking needs.

The Vida Verde project is located in Marbella, Spain, and is focused on sustainable living. Designed as a microhome, it thoughtfully separates areas meant for communal activities from those designated for privacy. The approach emphasizes the need for both functionality and ecological responsibility, creating a space that meets modern lifestyle requirements while respecting the environment.

Architectural Concept

At its core, the project features a vertical concrete wall that captures rainwater, serving both as a structural element and a barrier between public and private spaces. This wall includes a built-in wind turbine and louvre vents, enhancing natural ventilation. These features highlight the project's dedication to sustainability and provide innovative solutions for energy efficiency and air quality.

Materiality

The materials chosen for the construction include standing seam metal, lime plaster, hempcrete, cross-laminated timber, Argenta Ceramica tiles, and concrete with recycled aggregate. Each of these materials adds to the strength and energy efficiency of the home. The selection reflects a commitment to using resources that benefit the environment while ensuring durability over time.

Sustainable Systems

Incorporating renewable energy sources is a key aspect of the design. Solar panels and the wind turbine utilize the natural resources available in Marbella, allowing the home to function off the grid. This focus on self-sufficiency minimizes reliance on traditional energy sources. Additionally, a biogas system processes waste into energy, offering a practical solution for both energy and disposal needs.

Spatial Organization

The layout of the interior spaces is intentional, with private areas, such as the bedroom and bathroom, elevated above communal zones. This separation enhances personal space and creates an inviting atmosphere in the home. A liquid desiccant waterfall, placed in the private area, naturally manages humidity levels, further improving comfort and air quality for occupants.

The use of louvre vents introduces a dynamic quality to the living spaces, capturing light and air while allowing for privacy. This design element enriches the overall experience of the home and reinforces a strong connection with the surrounding environment. The combination of practical features and well-considered design details makes Vida Verde a notable example of modern sustainable living.

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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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