Chimneys and parapets are more exposed than any other part of a building, and wind, frost, rain and sun take their toll on all the materials. If they are allowed to get into a bad state of repair, rain can penetrate to the inside of the building. Falls of masonry from unstable chimneys and parapets pose real danger to people below. It is vital that repairs are carried out to a high standard and that bricks and mortar, and concrete and metal components, are carefully selected to ensure they are durable in severe exposure. This Good Repair Guide deals with how to make damaged chimneys and parapets safe and weathertight.