Koyanagi Sake Brewery Kettle Room

A single storey with a monitor roof on the ridge

Koyanagi Sake Brewery Kettle Room (小柳酒造釜場, Koyanagi Shuzō Kamaba) is a single-storey timber building of 1928 at 903-1 Ogicho, Ogi City, Saga Prefecture, listed as a Registered Tangible Cultural Property on 14 February 2002.

It abuts the Showa West Storehouse on the east. The building runs 11 metres along the ridge and 9 metres across, with a footprint of 96 square metres. The roof is Sangawara-buki pantile on a north-south ridge in Kirizuma-zukuri gabled form, carrying a ventilating monitor at the centre of the ridge. The walls are mainly vertical boarding.

A kamaba is where rice is steamed. Water is boiled in a kettle and the steam driven up through a koshiki tub to cook the grain. What to do with all that steam is the question that shaped this building.

A roof that lets steam out, a truss that spans the floor

The monitor on the ridge is the plainest feature of Koyanagi Sake Brewery Kettle Room. A monitor roof lifts a second, smaller roof above the main one and opens its flanks. Steam rising from the kettle collects under the roof and escapes through those openings. Unlike a skylight, it releases air without admitting rain.

The second feature is the King post truss on the south gable. A truss distributes load through triangles; the king-post form sets a single vertical member at the centre. A traditional Japanese Wagoya roof stands short posts on beams to carry the purlins, whereas a truss sorts its members into tension and compression, and so spans further with the same timber.

What matters here is that the frame was left visible from outside. The structure that carries 9 metres without an intermediate post is exposed on the south gable. The Agency for Cultural Affairs calls the framing fine-grained and notes the contrast with the north gable of the Showa East Storehouse alongside. That wall is closed with battened boarding; Koyanagi Sake Brewery Kettle Room shows its bones.

The vertical boarding elsewhere can be read the same way. Set the boards upright and water running down the wall follows the grain and drops clear, rather than sitting on horizontal laps.

A process turned directly into a building

The listing criterion is contribution to the historic landscape of the nation, and the registration number is 41-0031. Koyanagi Sake Brewery Kettle Room was completed in 1928 as part of the improvement scheme begun in 1926.

Its interest lies in how directly the work determined the architecture. Steam has to leave, so there is a monitor. Kettle and tub need clear floor, so the roof is trussed. There is almost nothing decorative; what survives is the shape that necessity produced. For anyone trying to read the process of a modern sake brewery off its buildings, this one is the central piece of evidence.

Its neighbours are closely bound to it. The West Storehouse adjoins on one side; in front of the western end of the south gable stands the 17-metre chimney that carried away the smoke of the kettle fire, so chimney and kettle room worked as one. The West and East Water Tanks are attached to the same south wall and supplied the water for steaming. Fire, water and steam are all concentrated on this side of the building.

The view to take is of the south gable. The triangle of the truss, the chimney standing in front of it and the two tanks to either side come into a single frame. Lift your eyes to the roof and the step of the monitor is there.

Visiting

The interior of Koyanagi Sake Brewery Kettle Room is closed. It houses working equipment and is not opened on its own.

The elevation worth seeing is the south gable, where the king-post truss appears. The chimney is the landmark to find it by; as the tallest structure on the site, its head is visible from the public road.

The yard can be entered during the hours of the Ogi Distillery in the converted part of the West Storehouse, 11:00 a.m. to 5:00 p.m. with irregular closing days. Walking through needs no arrangement, but how far you can go depends on the state of the yard that day. No photography policy has been published, so ask at reception. Directions and parking are set out on the Koyanagi Sake Brewery page. Details here were checked on 14 September 2026.