8. Predominant material in the exterior walls
[] 1 Cement or concrete
[] 2 Blocks or brick
[] 3 Adobe or mud wall (tapia)
[] 4 Bamboo-and-mud wall (bahareque)
[] 5 Cane, palm, straw and similar
[] 6 Waste material (cardboard, metals, planks, etc.)
[] 7 Other materials