The use of tatami was a little different from now.
Tatami floor wikipedia.
In martial arts tatami are the floor used for training in a dojo and for competition.
A tea room may have a floor area as small as 1 75 tatami mats one full tatami mat for the guests plus a tatami mat called a daime 台目 about 3 4 the length of a full tatami mat for the portable brazier furo or sunken hearth ro to be situated and the host to sit and prepare the tea.
A washitsu 和室 meaning japanese style room s and frequently called a tatami room in english is a japanese room with traditional tatami flooring.
Washitsu also usually have sliding doors rather than hinged doors between rooms they may have shōji and if the particular room is meant to serve as a reception room for guests it may have a tokonoma alcove for decorative items.
Or as large as 10 tatami mats or more.
Japanese people have used tatami since the nara era 710 794.
Tatami are covered with woven soft rush 藺草 igusa straw the core is traditionally made from rice straw.
They were knitted and became thicker like modern tatami people who lived in the heian era stepped onto tatami to show their power and they spread the tatami only in a necessary part of the room.
Tatami 畳具足 or tatami gusoku from tatamu 畳む to fold and gusoku meaning full suit of armour was a type of lightweight portable folding japanese armour worn during the feudal era of japan by the samurai class and their foot soldiers the tatami dō a foldable cuirass or the tatami katabira an armoured jacket were the main components of a full suit of tatami armour.