The roof and wall can be made of composite panel or veneer. Galvanized sheet metal can prevent rust and corrosion. The use of self-tapping screw can make the connection between the plates more closely, to prevent leakage. You can also use composite panel for roof and wall. The sandwich is polystyrene, glass fiber, rock wool, polyurethane. They have good thermal insulation, heat insulation, fire-retardant. The wall of the steel structure maintenance also can use brick wall. The cost of a brick wall is higher than galvanized steel roof and wall.