Sekishu roof tiles

The name Sekishu kawara points to Iwami, and the present production area points to western Shimane. Oda, Gotsu, Hamada, and Masuda form the local industry cluster described for these clay roof tiles. About 400 years of continuity can be seen through cities, kilns, and ordinary roofs that have kept the material in use.

The material begins with clay. Work with Sekishu kawara in regional-resource education describes Tsunozu Formation clay that can still be taken and fired in Shimane kilns, while regional clay fired above 1,200°C stands at the center of the tile’s quality. The local character here is a stratum, raw earth, and a kiln practice tied to the prefecture.

Sekishu kawara is fired at more than 1,200°C, roughly 100 to 200 degrees higher than other tile-producing areas. That firing is linked with resistance to cracking, cold, heat, sound, and salt damage. The tile has therefore been used in severe-cold Hokkaido, in Kyushu areas exposed to wind-driven salt, and along the Japan Sea side of Tohoku.

The current production boundary is easiest to understand through the maker community. The Sekishu Kawara Industrial Cooperative is based in Gotsu, Shimane, and six western-Shimane member businesses make up the cooperative group. University coursework and fieldwork brought makers, tile samples, weight, texture, and uses into the classroom, turning a roof material into something students could handle directly.

At the Shimane Arts Center Grantowa in Masuda, Sekishu red tiles move beyond the single-roof image. The tiles appear on the roof, walls, and floor. For visitors, the material is above the eaves, along walls, underfoot, and across public space, where the fired red surface becomes part of the building’s daily presence.

After the 2020 Kumamoto heavy-rain disaster, Sekishu kawara was adopted for 600 of 800 emergency temporary housing units. The reason was tied to sound: the tile is described as having about 30 percent higher sound insulation than metal and slate roofing, helping residents who had lived through heavy rain feel less anxious about rain noise. In that setting, the roof tile answered a daily question of weather, sleep, and shelter.

Sekishu kawara has also moved into wall tiles, floor tiles, tile tableware, lightweight tiles, and ceramic sand made by crushing off-spec fired tiles. These uses still center on the same fired material. A wall needs a surface, a floor needs durability, tableware shows the tile texture at hand scale, and ceramic sand keeps rejected pieces within a material cycle.