According to the historical picture materials, however, the residences of nobles had Hiwadabuki (construction with the bark of hinoki, Japanese cypress), therefore it can be said that Kawara was used only for public buildings.
しかし、絵画史料から、貴族の邸宅は桧皮葺で、瓦は公的な建物にしか用いなかったことがわかる。