What is located at the top of a factory-built chimney to divert rainwater from the chimney pipe to the chimney flashing?

The component located at the top of a factory-built chimney designed to divert rainwater away from the chimney pipe and direct it to the flashing is known as a storm collar. A storm collar is a fitting that fits snugly around the chimney pipe and extends down to the surrounding surface, effectively channeling water away from the vulnerable areas where the pipe penetrates the roof. This helps prevent water intrusion that could lead to damage inside the chimney or the structure itself.

In contrast, a chimney cap serves a different function by sitting atop the chimney flue to prevent rain, debris, and animals from entering the chimney, while also providing some protection from downdrafts. A chase cover typically refers to a protective covering for a chimney chase, which is different from a storm collar since it covers the entire chase rather than being a focused component for water diversion. The flue pipe is the pipe that carries the combustion gases up through the chimney but does not have a role in diverting rainwater.

Understanding the specific functions of these components is essential for proper chimney maintenance and ensuring the longevity of the chimney system.