A chimney cap is one of the simplest and most cost-effective ways to protect your chimney. Here's everything you need to know about types, materials, sizing, and installation.
A chimney cap sits over the top of the flue and serves several functions:
Single-flue caps fit over an individual flue tile and are the most common type for residential chimneys with one fireplace.
Multi-flue caps cover the entire chimney top and are used when a chimney has multiple flues — common in older homes with multiple fireplaces or a furnace flue.
Outside-mount caps attach to the outside of the chimney crown rather than inside the flue and are used when the flue tile is damaged or when a standard cap won't fit.
Galvanized steel is the most common and least expensive option. It will rust over time — typically 5–10 years in a wet climate like Southwest Washington's.
Stainless steel is more expensive but significantly more durable. A quality stainless cap should last 20+ years. This is what we recommend for most installations.
Copper is the premium option — extremely durable and develops a distinctive patina over time. It's primarily a cosmetic choice for high-end homes.
Proper sizing is critical. A cap that's too small won't cover the flue adequately. A cap that's too large can interfere with draft. We measure your flue precisely before ordering a cap to ensure a correct fit.
Most cap installations take under an hour. The cap is secured to the flue tile with set screws or a friction fit. Some caps require a sealant around the base to prevent water infiltration. We test the fit before leaving to ensure the cap is secure.
Horizon Chimney Sweep serves Vancouver, Woodland, and all of Southwest Washington. Licensed, locally owned, and honest about what you need.