premier étage
quatrième (4th) étage as the first floor (ground) is called rez-de-chaussée and the second floor is called premier (1st) étage
You say "quatrième étage" in French to indicate the fourth floor.
Le troisième étage is third floor in French.
The tenth floor is "le dixième étage" in French.
You would say "Le sol est la lave" in French to express "The floor is lava."
"ma cuisine est au premier étage"
balayer par terre
rez-de-chaussée = first floor You have to know that in France when then say '1er étage' (= first floor litteraly) they mean 2nd floor because they call the first floor 'rez-de-chaussée' (litteraly level with the ground) So their third floor is actually the fourth floor ...
Dernier etage.
plans d'étage
le plancher
D'appui au sol.