Partial Insulation House | 部分断熱の家

This project involved the renovation of a single-story traditional wooden house over 100 years old. Achieving both the open spatial character typical of traditional Japanese houses and modern residential performance is a major challenge. In this project, the solution was found through a bold partial insulation strategy.
An L-shaped area on the north and northeast sides was designated as the insulated zone, which also serves as the building’s primary seismic-resisting core. In contrast, the southwest side was maintained as an open Japanese-style room, where fittings can be fully opened to create an expansive interior–exterior connection.
While this approach creates a significant offset between the building’s center of mass and center of rigidity, structural reinforcement was carefully incorporated: bracing members were installed in the attic space above the Japanese-style room, and strong diagonal bracing panels were placed at the boundary between the insulated and open areas to ensure sufficient seismic performance.

Architectural and Environmental Design: Jun Nakagawa + Ryoji Tobe + Yuta Fukawa
Structural Design: Takuo Nagai
Program: Residence
Project Year: 2019

Photo: (c) Takeshi Yamagishi

築100年を超える木造平屋古民家の改修。和風古民家の開放的な空間性と現代的な居住性能を両立させるのは難しい課題であるが，本計画では思い切った「部分断熱」によりそれらを両立させる計画とした。北および北東にまたがるL字のエリアを部分断熱エリアとし，同時にこの建物全体の耐震性を担保する役割を持たせている。一方，南西側は建具を開け放てる開放的な和室空間としている。このため，建物の重心と剛心に大きな隔たりが生じてしまうが，和室エリアの小屋裏に補強ブレースを設置し，両エリアの境界部に強固な筋交い構面を配置することでじゅうぶんな補強を行っている。

意匠・環境設備設計：中川純＋戸邉亮司＋深和佑太
構造設計：永井拓生
用途：住宅
計画年：2019年

写真：(c) Takeshi Yamagishi