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Geothermal Thermal Mass with Local Stone and Straw Insulation in Mountain Retreat

Authors:
Dil Phagami Magar, Abhishek Rai, Bikrant Pakhrin, Kalpana Rai
Geothermal Thermal Mass with Local Stone and Straw Insulation in Mountain Retreat
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Emphasizing geothermal thermal mass and utilizing locally sourced stone and straw insulation, the structure provides a resilient haven for trekkers amidst the mountainous landscape.
5 key facts about this project
01
Utilizes geothermal thermal mass for energy efficiency and climate resilience.
02
Features locally sourced stone for structural integrity and thermal properties.
03
Incorporates straw insulation to enhance sustainability and comfort.
04
Designed with a bent A-frame to optimize space and views.
05
Encourages community interaction through strategically placed communal areas.

## Project Overview

The functional structure is situated in a mountainous region of the higher Himalayan belt, where it engages with both the unique climatic conditions and the cultural characteristics of the area. The design is informed by the architectural traditions of local ethnic groups, including Tibetan and Indian influences, and aims to accommodate the needs of hikers and trekkers while ensuring the resilience of the building against extreme weather conditions.

## Site Strategy

The architectural strategy delineates the site according to altitude and cultural specifics. Three geographic regions have been identified to inform design choices: the Tamangs, residing above 3000 meters with traditional Tibetan architecture; and the Sherpas and Thakalis, located in the Himalayan foothills, who reflect their unique cultural practices in a design that is adaptive to environmental demands. Local materials are effectively integrated, promoting both structural durability and cultural relevance.

## Design Development

Key design features include the orientation that maximizes natural light and warmth, and a layout that follows the natural topography of the land. The building’s lower section is partially embedded into the earth, utilizing geothermal benefits for improved thermal efficiency. A clear separation between communal spaces and private quarters enhances usability and privacy. The design also incorporates large glass panels in the upper levels, ensuring unobstructed views of the landscape and deepening the connection with the natural surroundings.

## Materiality

Sustainable practices are evident in the choice of locally sourced materials. Timber forms the structural framework and finishing elements, while lime render and straw bale insulation enhance the building's thermal performance. The use of local stone contributes to the structure’s strength and thermal mass, allowing it to meld seamlessly into its environment. This material selection reinforces the project's commitment to environmental sustainability and cultural authenticity.

## Spatial Configuration

The spatial organization consists of multiple levels designed for efficiency. The ground level features communal spaces like the dining area and a shared hearth, fostering social interaction among users. Upper levels provide sleeping quarters with scenic views, while the lower levels accommodate utility and storage needs. Each area is intentionally structured to promote functionality and enhance the experience for visitors.

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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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