Kominka Collective | Houses & ADUs

Irako Minka

This summary provides an overview of the structural and floor plan documentation for the Irako Minka. The minka is 90 years old. The beams are pine, and the posts are cypress. However, an estimated 20% of the wood is in bad condition. Therefore, one option is to use the materials in a new design as opposed to trying to renumber and replace missing parts to make the frame. The price for the materials will be reflected accordingly.

Floor Plan and Area

Structure: The building is a one-story, detached house.
Total Floor Area: 180.94 m² (54.73 tsubo).
Key Rooms: The layout includes multiple 8-tatami mat rooms, a kitchen, a bathroom, a washroom/dressing room, a boiler room, and a designated entrance. The plan also identifies spaces for storage, a tokonoma (alcove), and a tokowaki.

Structural Specifications

Elevations and Cross-Sections: The document includes detailed cross-sections labeled A-A, B-B, and C-C, all drawn to a 1/60 scale.
Openings: The designated opening height for the residence is 1,788 mm (5 shaku 9 sun).
Structural Elements: The documentation specifies various components, including:
- Sashigamoi (sliding door lintels): Multiple locations are identified with specific dimensions (e.g., W120 x H210, W115 x H315, W120 x H330).
- Watashimune (beams) and Purlins: References to various structural beams, including those with dimensions like W135 x H360.
- Ceiling Heights: Several rooms feature水平 (level) ceilings with varying heights, such as CH2150, CH2717, and CH2741, as well as areas with 勾配天井 (sloped ceilings).

Roofing

The documents include two roof plans, both at a 1/60 scale, with one specifically identified as an irimoya (hip-and-gable) roof. The roof plans detail the placement of ridges, purlins, and tenbin (balance/supporting beams).