Superpixel Label: Flooring and Walls
For Flooring and Walls, select a material only if you are sure what it is.
So if you know it is Brick or Concrete, choose one of those. Concrete is a specific kind of material.
Otherwise, select Flooring Other or Interior Exterior Walls Other.
For review, however, only mark it Incorrect if you are sure it is wrong.
So if the wall is Brick but a different label was selected, it is Incorrect. If Concrete was selected and it could be concrete, mark it Correct.