Home / Chimney Academy / Crown vs Cap vs Chase Cover
Chimney Crown vs Chimney Cap vs Chase Cover: What Each One Does
These three parts sit at the top of the chimney and are often mixed up. Each protects it from water in a different way, and each fails differently.
At a glance
| Part | What it is | Where it is used | What it protects |
|---|---|---|---|
| Crown | A sloped slab, usually mortar or concrete, across the top of a masonry chimney | Masonry chimneys | Sheds water away from the flue and brick below |
| Cap | A cover over the flue opening, usually metal with a screen | Masonry and factory-built flues | Keeps out rain, animals and debris; screens sparks |
| Chase cover | A metal lid over the whole top of a framed chase | Factory-built chimneys with a wood-framed chase | Keeps water out of the enclosure |
Chimney crown
The crown is the first line of defense for a masonry chimney. It is sloped so water runs off instead of sitting on the top. Cracks let water into the brick and mortar below. A crown that is cracked or crumbling can often be resurfaced or repaired; see chimney crown repair. Our Montclair project started with visible hairline cracks in the crown.
Chimney cap
The cap covers the flue itself. A good cap keeps rain and animals out and usually has a mesh to stop sparks. A missing or rusted cap is a common cause of nesting and moisture problems. See chimney caps and chase covers.
Chase cover
A prefab fireplace is often enclosed in a framed chase, which is capped with a metal cover. If that cover rusts or is poorly sealed, water gets into the structure around the chimney. Our Monroe Township project is an example of this repair.
Which one do I have?
- A brick or stone chimney has a crown and usually a cap.
- A wood-framed, siding-covered chimney usually has a chase cover and a cap.
- If you are not sure, an inspection will identify what you have and its condition.
Signs one of them has failed
Water stains on the ceiling or walls near the chimney, rust, white staining on bricks, animals, or visible cracks at the top. See why is my chimney leaking and parts of a chimney explained.
Frequently asked questions
Can I just seal the crown with caulk?
A thin coating or sealant can be part of a repair, but the right fix depends on the damage. Have it assessed before deciding.
Does every chimney need a cap?
A cap is generally recommended. It keeps water, animals and debris out of the flue.
Is a chase cover the same as a cap?
No. The cap covers the flue opening. The chase cover covers the whole top of the chase.
Next step
Request a visit or call (862) 225-6529 and tell us what you are seeing at the top of your chimney.
Sources
- Chimney Safety Institute of America (general chimney component and maintenance guidance)