Type:House/Location:Zushi,Kanagawa,Japan/Design:2016-17/Construction:2017/Consultant:Momi Structural engineering/Structure:Timber/Contractor:Kawaguchi-kenchiku/Site area:176m2/Built area:66m2/Total floor area:114m2


LL house is located in Zushi, Kanagawa, Japan. The site is in a residential area surrounded by mountains with a dense forest to the south. As the site is prone to dark winters, the south wall is slanted in the opposite direction of the mountain slope to capture views of the sky above the mountain. The design has the same sectional shape along the direction from the east to west, but a vertical shift in height provides natural sunlight and a rich spatial sequence that could come along with the purposes. Additionally, the eastern part is higher than the western part to create the main room since the western side of the mountain is higher than the eastern side. With it the main room could benefit from the better light and views. We have done numerous studies in 2D and 3D to determine the angle of the roof, the deviation of the whole volume, how the sunlight should entre, and the height for the parts with the deviation with regard to the overall sequence. The spaces connected by this skip floor continue up to the roof with a flow like an ant nest has–a sequence that considers its spread in plan and cross section. We have also given the flow of the sequence to the exterior by controlling the height and distance from the entrance. The structural features are that two large volumes on the second floor are pushed towards the south and that the projecting outer wall surface is oblique. And we have realised it with the conventional post and beam structure. The sitting area on the first floor has an expansive atmosphere with high ceiling. For the large-box like space which does not have any walls inside we adopted a construction method that is cantilevered on double the beams by applying the load-bearing walls.During construction it has been rationalised by using Japanese scale modules to produce the same sectional shape in two parts. The first floor is equipped with an under-floor heating and cooling system (heat storage-style). In winter, warm air passes through the entrance void and warms the second floor. Also, at the high level there are operable high side windows assisted by ceiling fans to aid in the vertical movement of air.