The outside of my chimney looks fine, so everything is OK, right?
You can tell a lot about a book by its cover. However, until you actually look inside you will not know everything about the story contained on the pages inside. In much the same way, the outside of a chimney can tell you a lot about the status of your flues, but it may not tell you the whole story. A trained look within can reveal things that can often go unnoticed by homeowners and untrained technicians. Have you had your chimney inspected by a CSIA Certified Technician lately?