Often overlooked because it can't be seen (above eye level) is the roof. Iron rooves in particular are prone to wear and tear and over time the paint and galvanising begins to wear. if not kept on top of - it becomes a costly replacement exercise. As shown below rustproofing, priming and painting can add years onto a life of a roof. Even it its just a yearly check - and only doing what needs doing at the time will have long term benefits.