The chimney crown is the concrete slab that seals the top of the brick and sheds water away from it. The chimney cap is the metal cover with mesh sides that sits over the flue opening to keep out rain, animals and debris. Every masonry chimney needs both.
The crown
Made of concrete, the crown covers the whole top of the chimney around the flue tiles. A good crown slopes away from the flue, overhangs the brick by a couple of inches and has a drip edge. Many crowns are built from ordinary mortar, which cracks quickly.
The cap
The cap covers the flue opening itself. It stops rain from falling straight down the flue, keeps birds and raccoons out and acts as a spark arrestor. Multi-flue caps cover the entire crown and protect it too.
How they fail
| Crown | Cap | |
|---|---|---|
| Common failure | Cracks from freeze-thaw | Rust, loose, blown off |
| Result | Water into brick and flue | Rain, animals, debris in flue |
| Fix | Seal or rebuild | Replace with stainless or copper |
More questions
Can a chimney cap replace a crown?
No, but a full-coverage multi-flue cap can help protect an existing crown from weather.
Need a local professional?
Chimney Champs has been a local chimney company for 13 years. We provide chimney crown repair in your area. Call (856) 300-9215 for a free estimate.
Sources & further reading
- NFPA 211 — Standard for Chimneys, Fireplaces, Vents, and Solid Fuel-Burning Appliances (National Fire Protection Association)
- Chimney Safety Institute of America (CSIA)
Keep reading
- 9 Signs Your Chimney Needs Repair
- Why Is My Chimney Leaking? 6 Causes and How to Fix Them
- Chimney Flashing Explained: Why It Leaks and How It's Fixed
- Flaking Brick and White Stains on Your Chimney: What They Mean
- Prefab Fireplaces and Rusty Chase Covers: A Guide for Newer Homes
- How Often Should You Clean Your Chimney?