What is the role of a chimney chase cover?

The purpose of a chimney chase cover is primarily to protect the chimney chase from water damage. A chimney chase is the structure surrounding a chimney, typically made of wood, and it can be vulnerable to moisture penetration, which may lead to rot or deterioration over time. The chase cover, often made of metal, fits over the top of the chase and helps to divert rain and snow away from the chimney flue, ensuring that moisture doesn't enter and cause damage.

Properly installed, a chase cover can significantly extend the lifespan of the chimney structure by preventing water from pooling and infiltrating the material underneath. While other aspects such as improving aesthetic appeal or contributing to the function of the flue may be incidental, the primary function of a chase cover is its protective capacity against water intrusion.