Chimney Cap vs. Chase Cover

These two terms get used interchangeably, but they're different parts protecting different structures. Here's the distinction.

If you've been told you need a "cap" by one person and a "chase cover" by another, you're not imagining things — they're genuinely different components, and knowing which one you have matters.

What a chimney cap does

A cap sits directly on top of the flue opening itself — the single pipe or masonry opening smoke travels through. It keeps out rain, snow, and animals, and on masonry chimneys it's usually a relatively small component compared to the whole structure. See cap installation.

What a chase cover does

A chase cover is much larger — it's the metal cover over the entire top of a factory-built chimney's chase (the enclosure housing the flue pipe), not just the flue opening itself. Chase covers are common on newer construction with prefabricated fireplaces, and because they're larger sheets of metal, they're more prone to rust, seam failure, and pooling water over time. See chase cover replacement.

Common failure signs for each

A failing cap usually shows up as animal intrusion or water directly inside the flue. A failing chase cover shows up as rust streaks down the siding, standing water on top after rain, or a rattling sound in high wind from a loose seam. If you're not sure which one your home has, that's a completely normal thing to ask us during a visit.

Newer suburban homes with a chase and chase cover fail differently than older masonry homes with a cap — rust and seam leaks rather than freeze-thaw spalling. We'll tell you which category your chimney falls into before quoting anything.