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Polyhedral Crystal Roof Constructed with Locally Sourced Timber and Geothermal Energy Utilization

Authors:
Yuiko Inoue, Ryo Murata, Ikumi Shimatani, Kazuki Yuri
Polyhedral Crystal Roof Constructed with Locally Sourced Timber and Geothermal Energy Utilization

Project in-detail

Constructed with a polyhedral crystal roof to optimize natural light and energy efficiency, this facility integrates geothermal resources and locally sourced materials to create a multifunctional space dedicated to wellness and community engagement.
5 key facts about this project
01
Polyhedral crystal roof structure enhances energy efficiency while maximizing natural light.
02
Central Trunk Frame design allows for flexible spatial configurations and multifunctional use.
03
Geothermal energy systems integrated for sustainable heating and cooling throughout the facility.
04
Local sourcing of materials minimizes environmental impact and supports regional craftsmanship.
05
Integrated gardens utilize geothermal heat for year-round cultivation of local flora.

## Overview

Located in Iceland, the "Tropism Phyllotaxis" project engages with the country's dynamic landscape of fire and ice, integrating architectural design with the natural environment. This undertaking emphasizes a comprehensive approach that incorporates local cultural elements, natural energy sources, and an intent to enhance community and wellness. Designed to facilitate interaction with the serene surroundings, the building is strategically positioned to provide optimal views of Lake Mývatn and other significant natural features.

### Material Selection and Sustainability

Material choices reflect both local conditions and ecological considerations, supporting a sustainable design ethos. Wood, chosen for structural framing and finishes, fosters warmth and aligns with environmentally responsible practices. Glass is employed across facades and roofs, maximizing natural light and maintaining visual connections to the landscape. Structural integrity is achieved through the use of steel in the truss systems, while thermal insulation materials, such as extruded polystyrene, enhance energy efficiency. Concrete provides foundational stability, complemented by metal roofing to withstand Iceland's environmental challenges.

### Spatial Configuration and Structural Design

The architectural composition features a polyhedral "Crystal Roof," characterized by angular forms that respond to solar and wind patterns. This innovative roof element not only optimizes sunlight penetration but also offers expansive panoramic views. Central to the design is the "Trunk Frame" system, which organizes functional spaces around a core area. This nucleus includes a brewery that reflects local food and drink culture, as well as gardens heated by geothermal energy, promoting year-round access to fresh produce. Therapeutic areas designed for wellness activities further leverage Iceland's natural healing attributes, reinforcing an overall commitment to community health and environmental integration.

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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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