The Liner You Can't See Is the One
Doing the Most Important Work.

The chimney liner is the interior passageway that channels combustion gases — smoke, carbon monoxide and other byproducts — from the firebox to the outside. It also insulates the surrounding masonry from the heat those gases carry. Clay tile liners, the most common type in older homes, crack over time from thermal cycling, moisture and age. When a liner is damaged, gaps allow heat and gases to reach combustible materials in the home's structure. Relining restores that protection and brings the system back to safe operating condition.

Most liner damage isn't visible without a camera inspection. Symptoms that suggest a liner problem include difficulty maintaining a fire, smoke backing into the living space, an unusual odor from the fireplace when it's not in use and visible deterioration in the firebox — crumbling tile fragments, for example. A Level 2 chimney inspection, which includes video scanning of the flue, is the definitive way to assess liner condition. Ace Chimney, Fireplace & Outdoor Living performs these inspections across the Louisville and Lexington areas and provides a clear assessment of what the flue shows.

The three primary options are stainless steel, cast-in-place and clay tile. Stainless steel liners are installed as a flexible or rigid system inside the existing flue and are suitable for most fuel types. Cast-in-place systems involve applying a liner material directly to the interior of the flue, restoring structural integrity and insulation value. Clay tile is the traditional material, still used in new masonry construction but not a practical option for relining an existing flue. The right choice depends on the chimney's construction, the fuel being burned and the condition of the existing structure.

Building codes vary by jurisdiction, but the National Fire Protection Association standard — NFPA 211 — is the baseline most inspectors and insurers reference. It requires that chimneys serving appliances be lined and that liners be free of deterioration. In Kentucky, many municipalities and counties have adopted codes that reference NFPA 211 or equivalent standards. Beyond code, insurers increasingly require documentation of liner condition for homes with active fireplaces. A CSIA-certified inspection and relining, where needed, protects the homeowner on both fronts.

Stainless steel liners carry manufacturer warranties ranging from 20 years to lifetime, depending on the grade of steel and the fuel type. Cast-in-place systems, when properly installed, are designed to last the life of the chimney. The longevity of any liner depends on proper use — burning the right fuel, maintaining adequate draft and keeping up with annual inspections. Ace Chimney, Fireplace & Outdoor Living has relined chimneys across central Kentucky that have been in continuous, trouble-free service for years. The work holds when it's done right.