What is one common material used for chimney caps?

Steel is a common material used for chimney caps due to its durability and resistance to weather elements. It can withstand high temperatures and is less prone to rust if treated or galvanized, which makes it an ideal choice for protecting chimneys from water damage and debris. Additionally, steel chimney caps can enhance the overall aesthetic of a chimney system and can be manufactured in various styles to suit different architectural designs. Other materials like stone and wood have their uses, but steel's unique properties make it especially suited for the harsh conditions that chimney caps often face, such as exposure to rain, snow, and extreme temperatures.