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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

Project in-detail

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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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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