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Chimney caps are necessary to keep animals, water, and debris from falling into your home. They also control the wind to minimize the risk of a backdraft. If you use your fireplace, a chimney cap is crucial to keep dangerous embers from flying out the top of your chimney.

No, chimney caps do not keep rain out entirely. However, chimney caps minimize rain and ice accumulation inside the chimney, preventing significant water or ice buildup in your home. They must remain partially open to allow exhaust to escape. As such, they do not provide a completely waterproof barrier.

Chimney caps can last three to 25 years or longer, depending on the quality of the material. Galvanized chimney caps tend to have shorter lifespans, but stainless steel, aluminum, and copper caps can last more than 25 years, making them some of the soundest chimney cap investments you can make.

Generally, the top of the chimney cap must be at least five inches above the top of the flue. If you hire a handyperson for your chimney cap installation, they can advise on the size and type of cap to purchase.

Chimney crowns—similar to chimney chase covers—are flat areas directly beneath the chimney cap. The installer reinforces the top of the chimney with mortar or concrete to shed water and provide a protective cover for your chimney, sealing the top. A chimney cap is still necessary to protect the flue against weather and animals.