Chimney caps provide a number of benefits for a relatively small amount of money. First, the cap prevents animals from climbing down the chimney into your home. Rodents, as well as birds, sense the warmth from inside your house and climb down the chimney walls to gain access to your homes interior. Once in your home, they can cause a lot of havoc. They also may set up camp inside your chimney, blocking the flow of smoke exiting the fireplace.
Further, a chimney cap can help prevent burning embers from flowing up the chimney and landing on your roof where they may start a fire or create other damage.
While we're up there, we can check for damage to the mortar top used on many chimneys. Over time the mortar will deteriorate, providing the opportunity for water damage to the chimney.