HISTORY
Kawara 瓦 came down form Korean Peninsula to Japan in Asuka-era (飛鳥時代592-710).
At first, it was used for only temples as a roofing material. Then it had been gradually used for aristocracy's palace in Heian-era (平安時代 794-1185). It became Edo-ra (江戸時代1603-1868), Kawara was used for general buildings because it had fire resistance performance.
TYPES
1, Clay tile (NENDO KAWARA 粘土瓦)
Clay roof tile is the tile made of mud.
It can be divided three types.
a). glazed tile (YUYAKU KAWARA 釉薬瓦)
b). smoked tile (IBUSHI KAWARA いぶし瓦)
c). non-glazed tile

c). non glazed tile (SUYAKI KAWARA 素焼瓦)
It is the tile burned without glaze.
It is a tile which made from wood with thin metal on the surface.
It was began to be used for some castles in Edo-era (江戸時代1603-1868). It is considered that they use Metal Kawara to reduce the weight of a roof of such a high building.
3, Stone tile (ISHI KAWARA 石瓦)
It is a tile made from stone.
It thought up to use in cold area. Because clay tile got freezing damage, It couldn't be used in cold area.
I don't think there's anything that really says "Japan" to me like these classic clay and stone roof tiles. They're just such an ingrained part of old Japanese architecture. It's a shame they aren't still used nowadays, even though I understand why they aren't.
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