At that time, the roof was covered with plane tiles at first, and then concave tiles were laid at each joint, which is nearly the same as the present-day Hongawarabuki (a style of tile roofing in which round and square tiles are laid down alternately).
仕様は平瓦を並べ、そのジョイント上に丸瓦を並べた現在でも使われている本瓦葺きとほぼ同じである。