敷地は兵庫県神戸市内。南側に交通量の多い幹線道路が通る。街路樹と店舗の軒先が単調に連続している街並みの中に住宅を計画するにあたり、軒のあり方、道路と歩道との関係性を再考し、密度の高い街の中で、行き交う人達に圧迫感を与ない空気のような居場所ができないかと考えた。
具体的にはまず、ボリュームを歩道いっぱいまで建築するのではなく、軒先のみを隣地と揃えながら、セットバックさせた。1階RC造、2、3階木造の混構造3階建てとし、1階はボリュームを敷地中央に凝縮させることで、全体の浮遊感を演出し、上部もボリューム操作により圧迫感を軽減させた。軒は奥行き2,275mmのキャンチレバーとし、見付は215mmに抑え、軽やかな表現としている。さらに軒上と軒下には植栽スペースを設け、立体的な庭とすることで、街の中にぽっかりとした「余白」を生み出し、喧騒を受け止めるような懐の深い設えとした。
1階の外部空間は、駐車スペースと機能を限定しないフレキシブルなスペース、内部空間はエントランスと収納、2階にはLDKと水廻り、3階に家族の居室という構成にしているが、内部も「余白」の延長として捉え、強固な壁で仕切るのではなく、吹き抜けや枝付き丸柱などが弱い領域性のみを生み、その中に家具や浴槽が置かれて初めて空間に機能性が見えてくるような空間づくりを行った。
2階の南側、東側に大きく開口を取り、光や風を内部に十分取り入れながらも、「余白」が街との緩衝帯となり、両者を緩やかに関係付ける。敷地は準防火地域内であるため、内外の境界には燃え代を含む化粧柱を配しているが、その比較的広い柱幅を利用し、サッシの枠、縦框が内部からは見えない納まりとした。さらに耐力壁には鉄筋ブレースを採用、内装はモルタル系の左官仕上げとするなど、内外を差異化させる要素を可能な限り削ぎ落し、街、余白、内部がシームレスな関係となることを目指した。
合理的で無駄がなく、どこか窮屈ささえも感じる街の中の限られた敷地面積の中で、「余白」により家はどこまでも自由でおおらかな場所となり、自他共にホッとする安心感を与えてくれる。（岸本貴信）
A residence with a tolerant attitude, breathing life into the gaps between cities
The site is located in Kobe City, Hyogo Prefecture. A busy arterial road runs along the south side. When planning a residential building within a monotonous streetscape of street trees and storefronts, we reconsidered the design of the eaves and the relationship between the road and sidewalk, aiming to create an airy space that does not overwhelm passersby in the densely populated area.
Specifically, instead of building the volume to the sidewalk, we aligned the eaves with the neighboring property while setting them back. The building is a three-story mixed-structure design with a reinforced concrete first floor and wooden second and third floors. By concentrating the volume of the first floor at the center of the site, we created a sense of floating for the entire structure, and by manipulating the volume of the upper floors, we reduced the feeling of oppression. The eaves are designed as a cantilever with a depth of 2,275mm, and the projection is kept to 215mm for a light and airy expression. Additionally, planting spaces are provided above and below the eaves, creating a three-dimensional garden that generates a “blank space” within the city, offering a deep, embracing design that absorbs the hustle and bustle.
The first-floor exterior space is a flexible area limited to parking and other functions. The interior space is composed of an entrance and storage area on the first floor, an LDK and bathroom facilities on the second floor, and family bedrooms on the third floor. However, the interior is also conceived as an extension of the “blank space,” with weak boundaries created by open spaces and branch-like round columns rather than solid walls. The functionality of the space becomes apparent only when furniture or bathtubs are placed within these boundaries.
Large openings on the south and east sides of the second floor allow ample light and air into the interior, while the “white space” serves as a buffer zone between the house and the street, gently connecting the two. Since the site is located in a quasi-fireproof zone, decorative columns with fire-resistant layers are placed at the boundaries between the interior and exterior. However, the relatively wide column width is utilized to conceal the window frames and vertical frames from the interior. Additionally, steel braces are adopted for the load-bearing walls, and the interior finish is a mortar-based plaster finish. By minimizing elements that differentiate the interior and exterior, the design aims for a seamless relationship between the street, the “white space,” and the interior.
Within the limited site area of the city, which is rational, efficient, and almost cramped, the “open space” makes the house a place of endless freedom and openness, providing a sense of security that brings comfort to both oneself and others. (Takanobu Kishimoto)
【余白】
所在地：兵庫県神戸市
用途：戸建住宅
クライアント：個人
竣工：2022年
設計：CONTAINER DESIGN
担当：岸本貴信
構造設計：廣田右喬（うきょう建築構造事務所）
施工：ienowa produced by 中尾建設
撮影：冨田英次
工事種別：新築
構造：混構造（木造、RC造）
規模：地上3階
敷地面積：85.28m²
建築面積：52.48m²
延床面積：113.15m²
設計期間：2020.11-2021.07
施工期間：2021.07-2022.03
【Margin】
Location: Kobe-shi, Hyogo, Japan
Principal use: Residence
Client: Individual
Completion: 2022
Architects: CONTAINER DESIGN
Design team: Takanobu Kishimoto
Structure engineer: Ukyou Structural design office
Contractor: ienowa produced by Nakao Kensetsu
Photographs: Eiji Tomita
Construction type: New building
Main structure: Mixed structure (Wood, RC)
Building scale: 3 stories
Site area: 85.28m²
Building area: 52.48m²
Total floor area: 113.15m²
Design term: 2020.11-2021.07
Construction term: 2021.07-2022.03
