The chimney crown is a slab of concrete on top of the chimney. The sole purpose of the chimney crown is to prevent water from running into the chimney. The most common cause of cracks in the chimney crown is due to shifting of the structure or from shrinkage dating back to the first day the crown was put on. The water goes right through those cracks into the chimney, when your crown has cracks. Don’t worry! You can fix it. However, fixing a cracked crown depends upon how bad the damage is. Fortunately, most crowns have small cracks. Having said that, even small ones need to be fixed as all big cracks started out as small ones. During the winter, water freezes and thaws in the cracks of the chimney crown which ultimately forces the small cracks to eventually become big cracks. The good news is, there are crown coating materials such as Chimney Saver Crown Coat which cover the masonry and prevent small cracks from becoming a real problem. But once chimney crown has damaged significa...