Wooden floor - Itabari yuka

...Cut stones or tiles laid at a 45-degree angle to the wall line are called shihanjiki. Temple architecture with wooden floors dates back to the Nara period, but they were not widely used until the Heian period. At first, they were low-planked floors with no beams, but from the late Heian period onwards, they began to have high wooden floors like those used in residential buildings. It was only from the latter half of the Muromachi period onwards that tatami mats were used to cover the entire floor. ...

*Some of the terminology that refers to "wooden flooring" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…壁の線に45度の角度で切石や瓦を敷いたものを四半敷（しはんじき）という。板張り床を設けた寺院建築は奈良時代からあるが，広く用いられたのは平安時代以後で，最初は束を用いないころばし根太の低いものであったが，平安後期からは，住宅建築と同じく高い板張り床を設けるようになった。床上一面に畳を敷くのは室町時代後半以後である。…

※「板張り床」について言及している用語解説の一部を掲載しています。

出典｜株式会社平凡社世界大百科事典 第２版について | 情報