Flue & Damper Repair: Restore Proper Draft & Prevent Hazardous Leaks

A damaged flue liner can allow heat and combustion gases to contact masonry or framing, increasing fire hazards. Cracks or gaps in the flue lead to creosote accumulation and impaired draft, reducing heating efficiency.

A stuck, warped, or broken damper prevents proper opening or closing, causing smoke to fill living areas or allowing outside air and pests into your home. Prompt damper repair restores tight seals and prevents energy loss, drafts, and indoor pollution.

Insurance companies and building codes often require a fully functional flue and damper. Documented flue & damper repair ensures compliance, maintains indoor air quality, and extends the lifespan of your fireplace and chimney system.

• Cracked or Spalled Flue Tiles
  Visible cracks or flaking in clay flue liners allow heat and gases to penetrate adjacent areas, compromising safety.
• Corroded Metal Flue Liners
  Rust holes or thinning in stainless steel liners cause leaks of smoke and carbon monoxide into the home.
• Warped or Bent Dampers
  Damaged damper plates fail to seal tightly, letting cold drafts, pests, and moisture enter when the fireplace is not in use.
• Incorrectly Fitted Dampers
  An improperly installed damper can stick or jam, preventing full opening and causing smoke spillage into living areas.
• Obstructions & Debris
  Leaves, animal nests, or soot buildup block the flue passage and impede proper ignition, draft, and venting.

1. Comprehensive Inspection: A certified technician conducts a Level 2 video flue scan to identify cracks, corrosion, and obstructions in the flue liner. They also test damper operation and inspect for warped or broken components.

2. Clean & Clear Debris: The flue and damper area are thoroughly cleaned—removing soot, creosote, nests, and debris—so underlying damage is fully visible before repair begins.

3. Replace or Patch Flue Tiles/Liner: • Clay Flue Tiles: Damaged tiles are removed and replaced, then mortar joints are sealed to restore a continuous, insulated flue.
• Stainless Steel Liners: Corroded sections are patched or the entire liner is replaced with a high-grade, insulated flue liner for durability.

4. Repair or Replace Damper Assembly: The old damper is removed, and the new top-sealing damper or throat damper is fitted precisely. Technicians ensure a tight seal when closed and smooth operation when opened.

5. Seal & Insulate: After liner work, gaps between flue and masonry are filled with fire-rated sealant. A damper throat is sealed with high-temperature silicone to prevent leaks when the fireplace is not in use.

6. Final Testing & Draft Assessment: The technician lights a small test fire or uses a smoke pencil to confirm proper draft. They verify that smoke exits cleanly and that the damper closes tightly without gaps. A written report documents all repairs and recommendations.

Ensured Safety & Code Compliance: Professionals follow NFPA guidelines and local building codes, ensuring your flue and damper meet the highest safety standards.

Expert Diagnosis & Durable Solutions: Certified technicians accurately diagnose underlying damage and use high-grade materials—like insulated stainless steel liners and top-sealing dampers—for long-lasting repairs.

Improved Heating Efficiency: A restored flue and properly sealing damper optimize draft, reduce heat loss, and ensure cleaner, more efficient combustion—saving on fuel costs.

Peace of Mind & Warranty Coverage: Many professionals offer warranties on labor and materials. A documented repair provides proof for insurance and resale disclosures.

How can I tell if my flue liner is cracked?

Common signs include visible cracks in the firebox, spalling bricks, or soot on the chimney exterior. A video flue inspection by a professional confirms hidden damage.

What does a damaged damper sound or feel like?

A warped or bent damper may feel stuck when opening/closing, create whistling drafts, or allow cold air and pests inside. Smoke lingering in the room is also a sign of damper failure.

Can I repair a flue liner myself?

DIY patch kits exist, but they often only address surface cracks. Full flue repair requires professional tools and materials to ensure a safe, code-compliant fix.

How much does professional flue & damper repair cost?

Pricing varies by region and extent of damage. Simple damper replacements start around $200–$350. Flue liner repairs or relining can range from $500–$1,500 depending on liner type and chimney height. Always request a written estimate.