Type: House / Location: Karuizawa, Nagano, Japan / Design: 2014-2020 / Construction: 2018-2020 / Consultant: Low Fat Structure, hondaGREEN/ Structure: reinforced concreat+wooden structure / Contractor: Takehanagumi / Site area: 1047m2 / Built area: 128m2 / Total floor area: 163m2
//船のようなもの//
建主からの要望は安心して眠れ、朝陽を気持ちよく享受できることであった。森の中の敷地東側に建つ母屋（平家）の寝室は東側道路に近いことから、やや不安を感じながら寝ていたためである。さて、この建物は船のようでもある。船は甲板/デッキを境に水面と接する船体/ハルとその上の操舵室や船室/キャビンからなる。この建物のデッキは張り出しながら四周を巡っているため、下からよじ登ることは困難で、つまり外部においてはハルとキャビンに明確な境界をつくりだしている。頑丈なハルはRC造、軽快なキャビンは木造（一部鉄骨造）でつくられ、この隆起する地面/サーフェイスに漂っている。
//水平・垂直とダイヤゴナル//
長野県軽井沢の森の中に佇む住宅。敷地は浅間山を背に南側へ緩やかに傾斜している。約900年前の浅間山の噴火によって火砕流の被害があったとされるエリアであり、敷地内を掘ればすぐに浅間石と呼ばれる溶岩石が現れる。よって水捌けは良く、軽井沢の中でも比較的湿気の少ないエリアである。車は東側と南側道路から主にミズナラやコナラの木々のなかを縫いながら建物の南側へアプローチし、1階の軒下に収まる。南側の陽を取り入れることと、パーキングに雪を落とさないように片流れ屋根が北側を水下として約20ｍ伸びる。このプロポーションは全体のバランスと共に、天井高が低くなる水下側のプランや隣地への日影規制等も計画の要素となった。2階の南側の大きな甲板状のバルコニーから続く外回廊も、屋根勾配に合わせる形でシフトしながらぐるりと巡る。建物内においてもこの連続して変化する屋根勾配に呼応して2階は床レベルが一部異なる。1階はエントランスホールと執務室とゲストルームを合わせたようなセミパブリックスペースが水平方向/X軸、Y軸に変化しながら（時に飛び出しながら）計画されている。そして、建物北側で垂直方向/Z軸に延びる吹抜けを通して２階へと繋がる。Z軸に変化し続ける2階もまた、室名を与えるのが難しいベッドとミニキッチンとダイニングテーブルとバスタブが置かれたプライベートスペースにおいて、床材をフローリングで統一することで、それらが共存可能な空間をつくりだしている。開口部は、南側はもちろんのこと、朝陽を取り入れるためと、周囲の景色の抜けの良さから東側を主としている。構造は混構造で、その異なる構造のバランスを取ることに重点が置かれた。具体的には屋外の大きな甲板や、天井高があり且つ無柱空間の2階のプライベートスペースにおける柱梁の構成や、上階の軸を意識した1階RC造の壁や梁などである。設備は主要居室に灯油によるFF式暖房を備えると共に、1階床には蓄熱式床暖房、2階の壁の一部には壁面暖房を備え、年間を通じて東京との行き来の多い建主がいつでも利用できる計画としている。外構計画は、既存樹木を活かしながら東側は地元の浅間石で屋外広場を形成。連続性のある1階の犬走、2階の外回廊、屋根の軒下が３層に重なり、空に広がりながら景色を切り取るそのダイヤゴナルなラインがインテリアからも感じとれる建物である。
//A house like a ship//
The owner’s request was to sleep with peace of mind and enjoy the morning sun comfortably. The bedroom in the main building (flat building) on the east side of the site is on the first floor and close to the eastern road, so he slept with some anxiety.This house is like a ship. A ship consists of a hull that is in contact with the water surface with the deck as a boundary, and a pilothouse and cabin above it. Since the deck of this building goes around four laps while overhanging, it is not possible to climb from below, which means that it creates a clear boundary between the hull and the cabin on the outside. The sturdy hull is made of concrete and the light cabin is made of wood (partially steel), which seems to float on the raised ground / surface.
//Horizontal, vertical and diagonal//
A house located in the forest of Karuizawa, Nagano Prefecture. Karuizawa is a very popular place as a mountain resort in Japan. The site slopes gently to the south with Mt. Asama in the background. It is an area that is said to have been damaged by pyroclastic flows due to the eruption of Mt. Asama about 900 years ago, and lava stones called “Asama stones” appear immediately after digging the site. Therefore, the water drainage is good, and it is an area with relatively low humidity in Karuizawa. The car approaches the south side of the building from the east and south roads through the trees of Quercus crispula and Quercus serrata, and fits under the eaves on the first floor. The shed roof extends about 20m with the north side under the water for the reason of taking in the sunlight on the south side and not dropping snow on the parking lot. This proportion was decided from the plan of the part where the ceiling height is low and the shade regulation to the adjacent land. The outer corridor, which continues from the large deck-shaped balcony on the south side of the second floor, goes around the building while shifting according to the slope of the roof. The floor level of the second floor is partially different in the building according to this continuously changing roof slope too. On the first floor, a semi-public space that looks like a combination of the entrance hall, office, and guest room is planned while changing horizontally / X-axis and Y-axis (sometimes popping out). Then, on the north side of the building, it connects to the second floor through a stairwell extending in the vertical direction / Z axis. The second floor, which changes the form to the Z axis, also creates a space where they can coexist by unifying the flooring with wood in the private space where the bed, kitchenette, dining table and bathtub are placed. The opening is mainly on the east side to take in the morning sunshine and because of the good view of the surrounding scenery. The structure was a mixed structure, so it was important to balance the wooden and concrete structures. Specifically, the large outdoor decks, pillars and beams in the private space on the second floor with a high ceiling and no pillars, and RC walls and beams on the first floor that are conscious of the second floor. The facilities are equipped with FF type(Forced Draught Balanced Flue) heating with kerosene in the main living room, heat storage type floor heating on the first floor, and wall heating on a part of the wall on the second floor. Therefore, the plan is to make it available to owners who frequently travel to and from Tokyo throughout the year. In the exterior plan, an outdoor space is formed with local Asama stone on the east side while making use of existing trees. The continuity of the wooden approach on the first floor, the outer corridor on the second floor, and the eaves of the roof overlap in three layers. They cut out the scenery while spreading in the sky, and the diagonal lines can be felt from the interior too.