Nature of the floor (primary construction)

Column (5), (6), and (7): Type of roofs, walls, and floor
Observe the type of the roof, walls, and floor of the main building (head of household's building) of the dwelling unit and circle the numbers corresponding to the observed characteristics in the appropriate columns.
In all cases, mention the predominant material (i.e. the most used) in the case of buildings made with several materials.