The cheapest component on your chimney prevents the most expensive repairs. Here is what a cap actually does.
An uncapped flue is an open pipe into your house. Over a single Ohio year it takes in roughly the rainfall of a small bucket, straight onto your damper, smoke shelf and firebox.
What a cap prevents
- Rain and snow entering the flue — the leading cause of rusted dampers and liner damage
- Birds, raccoons and squirrels nesting in the flue, which blocks venting
- Leaves and debris blockages that push carbon monoxide back into the house
- Embers landing on your roof or a neighbor's
- Wind-driven downdrafts that blow smoke into the living room
Types of cap
| Type | Best for |
|---|---|
| Single-flue stainless | Most standard masonry chimneys |
| Multi-flue cover | Chimneys with two or more flues under one crown |
| Custom-fabricated cover | Oversized or irregular crowns |
| Chase cover with cap | Prefab chimneys with metal chases |
| Draft-correcting cap | Chimneys with persistent downdraft or smoke rollback |
Buy stainless, not galvanized. Galvanized rusts through in a handful of Ohio winters and the rust streaks stain the brick below it.
Frequently Asked Questions
How much does a chimney cap cost installed?
In the Cincinnati area, most standard stainless single-flue caps run $250 to $850 installed depending on size, with custom multi-flue covers above that.
Can I install a chimney cap myself?
It is roof work at the highest point of your house, and an incorrectly sized cap restricts draft. This is one to leave to an insured crew.
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