The meaning of dreams
Can't elaborate, because your dream is not detailed enough.
The possibilities are as follows
1, are you worried about the quality of your wooden floor, or do you dislike it?
So I dreamed it cracked.
2. Cracking of the floor symbolizes that the stability is affected. Cracking indicates that it is affected by the outside world.
Maybe you had a dream because something boring happened to you, which affected your mood.