Quick Answer
If it’s rusted out or the linkage is busted, you’re looking at a pro call. That can run anywhere from $150-$250 for a simple adjustment or minor repair to over $800 if you need a whole new throat damper installed, or $350-$600 for a new top-sealing damper.
Common Symptoms
Possible Causes
Step-by-Step Diagnosis
Step 1
Ensure the fireplace is completely cold, then locate the damper handle or chain and test its movement for stiffness or looseness.
Step 2
Use a strong flashlight to visually inspect the damper plate (for throat dampers) or listen for a sound from the roof (for top-sealing dampers) when operating the control.
Step 3
For a throat damper, gently push on the plate with a poker to feel for resistance, which indicates a blockage or rust.
Step 4
Perform a 'paper test' by holding a piece of tissue near the closed damper area; if it moves, the damper is not sealing properly.
DIY vs Professional Costs
| Repair Type | DIY Cost | Professional Cost | Time Required |
|---|---|---|---|
Cleaning a Sticky Throat Damper | $10-$30 | $150-$300 | 1-2 hours |
Minor Damper Handle/Rod Adjustment | $0-$10 | $125-$250 | 30 mins - 1 hour |
Throat Damper Replacement | Not Recommended | $400-$800+ | 3-5 hours |
Top-Sealing Damper Installation | $200-$400 | $350-$600 | 2-4 hours |
When to Call a Professional Chimney
- When the damper is severely rusted, bent, or has visible broken parts.
- If smoke or drafts persist even after you've attempted to clean and close the damper.
- Anytime a repair requires getting on the roof to access a top-sealing damper.
- If you are unsure of the problem or don't have the right tools to safely perform a repair.
Prevention Tips
- Schedule an annual chimney inspection and sweeping to remove creosote and debris that cause sticking.
- Operate the damper a few times during the off-season to prevent the mechanism from seizing.
- Always close the damper fully once the fire is completely cold to prevent moisture and debris entry.
- Consider upgrading a faulty or inefficient throat damper to a more energy-efficient top-sealing model.
Frequently Asked Questions
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