Being in an area of Japan with cold winters with a lot of snow in addition to this passive heat gain on the south side glazing, the house was isolated with 100mm insulation material and all the windows were fitted with pair glass. The feel of warmth of the house is further strengthened by the use of materials. The main structure is a wooden column and post structure left exposed in the ceilings of the main spaces. Only a few finishing materials are used and in a clear order. The walls in the length of the house are finished with 900 mm x 900 mm square meranti plywood panels treated with transparent lacquer while in contrast in the cross direction, the walls are finished in Japanese spruce plywood. The floors are in birch plywood for the main spaces and orange brown plywood (Nitax Wisa Light Brown from Finland that is protected with a poly-vinyl layer developed as material for concrete formwork) for the in-between zones. The Japanese room and the master bed room is finished with a tatami floor while the spare bedroom has a floor of Larch plywood stained whitish the same as the ceilings of the main spaces. Only the in-between zones have a lowered ceiling that accentuates the meaning of these zones.
This simplicity of materials is to avoid the use of catalogue materials and to avoid as much as possible the use of standard products. Instead standard raw materials were used to the size of a dimension system (900 mm x 900 mm base module) to give homogeneity to the spaces and the building. Throughout the house, the openness can be moderated by opening or closing sliding doors. By using color difference (orange concrete formwork plywood against Birch plywood) in the floor and changes in the ceiling, the spaces are determined. Add to this the clarity of the module used to give rhythm to the materials automatically strengthening the optically measurability of distances.