After around the mid-Muromachi period, the popularity of tatami mats rapidly began to spread and were bedded in small rooms such as shoin (zashiki of Shoin-zukuri or living and study room), but in a large room like kaisho, tatami mats were used in oimawashi (where the long side of tatami is set against the wall), leaving a wood floor in the center.
室町時代の中期頃から畳が急速に普及し始め、書院（書院造りの座敷、又は居間兼書斎）などの小室には畳を敷きつめるようになったが、会所などの大広間では、周囲に畳を追回しに敷いて、中央は板敷を残していた。