In ancient times, a thin copper or lead plate was put on a wooden form in a shape of a flat tile, concave tile or yakugawara tile (roof tiles with a special purpose), and this tile was laid on a roof in the same manner as a clay tile.
古くは、平瓦、丸瓦、役瓦の形に造られた木の形に銅や鉛の薄い板を貼り付け粘土瓦と同じような方法で葺いた。