Masonry Fireplace Relining: Why It’s One of the Most Complex Chimney Repairs
Relining an open-burning masonry fireplace is one of the most challenging repairs that can be performed on a chimney system. Unlike wood stove or fireplace insert liners, open fireplaces require very large-diameter stainless steel liners—often around 16 inches in diameter—to maintain proper draft and safe operation.
Because of the size of these liners and the way masonry chimneys are constructed, relining is rarely as simple as lowering a liner down the chimney.
Step 1: Evaluating the Existing Flue
Most masonry chimneys contain terracotta clay flue tiles. Before a stainless steel liner can be installed, we must determine whether the existing clay liner can be removed.
In properly constructed chimneys, the clay liner is separated from the surrounding masonry by an expansion space. This often allows specialized rotary equipment to break apart and remove the clay liner.
However, some chimneys were built with mortar, concrete, or masonry packed tightly around the clay flue tiles. When this occurs, removing the clay liner may be extremely difficult or impossible without damaging the chimney structure.
Step 2: Creating Access to the Smoke Chamber
The bottom of the new liner must be connected to the fireplace throat and smoke chamber area.
To accomplish this, access openings typically must be created near the damper area. Depending on the fireplace design, this may require:
Partial demolition of the smoke chamber Removal of portions of the damper area Temporary removal of firebrick within the fireplace Exterior access openings in certain factory-built systems
After the liner is installed, all affected masonry must be rebuilt and restored.
Step 3: Installing the New Stainless Steel Liner
The stainless steel liner is lowered through the chimney and connected to the smoke chamber. Due to the large size and weight of these liners, installation often requires roof work, specialized equipment, and multiple technicians.
Unlike smaller wood-stove liners, open-fireplace liners are heavy, expensive, and more difficult to maneuver within an existing chimney structure.
Alternative Method: Lining Inside the Existing Clay Flue
In some masonry fireplaces, the existing clay liner may be left in place and a stainless steel liner installed inside it.
When this approach is used, portions of the firebox and damper area may still need to be temporarily removed so the liner can be properly connected and rebuilt afterward.
Because the new liner reduces the effective size of the flue, some fireplaces may require modifications to the fireplace opening to maintain proper draft performance. This can often be accomplished through discreet masonry modifications or custom-fabricated smoke guards that preserve the fireplace’s appearance.
When Relining Isn’t Possible
If the original clay liner cannot be removed and there is insufficient room to install a stainless steel liner, alternative restoration methods may be recommended.
One common option is a refractory flue restoration system such as HeatShield®, which repairs and resurfaces the existing clay liner rather than replacing it.
Why Fireplace Relining Is Expensive
Open-fireplace relining combines multiple specialized trades into a single project:
Chimney engineering Masonry demolition and reconstruction Stainless steel fabrication and installation Roof and ladder work Heavy material handling Firebox and smoke chamber restoration
Every chimney is different, and some conditions cannot be fully evaluated until work begins. For that reason, fireplace relining should only be performed by experienced chimney professionals familiar with the structural, drafting, and safety requirements of open-burning fireplaces.
When completed correctly, a relined masonry chimney can provide decades of safe and reliable service while preserving the character and function of the original fireplace.
