6. What is the predominant material in the outside walls of the building or house?
[] 1 Cement block, brick, stone, concrete
[] 2 Wood (planks, boards)
[] 3 Clay-covered plant fiber (quincha), adobe
[] 4 Metal (zinc, aluminum, etc.)
[] 5 Straw, palm leaves, cane, sticks
[] 6 Other materials
[] 7 Without walls