You can’t always tell if your chimney is functioning correctly. However, there are some visible signs that your chimney might need repair. One common problem is damaged mortar joints. Damaged mortar joints are dangerous and should be repaired as soon as possible. What seems like a minor issue can quickly become a significant issue. When water seeps into small masonry cracks, they can turn into large cracks. Ultimately if the chimney isn’t repaired, it could face severe damage.