Damaged chimney flues repaired in Fairview Shores

The kinds of lining the code accepts

For ordinary residential appliances, Section R1003.11.1 of the Florida residential code lists four acceptable flue lining systems. Any repair or replacement we propose has to leave your flue inside one of them.

When a proposed fix does not clearly land in one of these categories, we say so and explain what that means for using the fireplace.

• Clay flue lining complying with ASTM C315
• Listed and labeled chimney lining systems complying with UL 1777
• Factory-built chimneys, or chimney units, carrying a listing for use inside a masonry chimney
• Other approved materials that hold up against flue gases and condensate to 1,800 degrees F without corroding, eroding, softening or cracking

Repair or reline, how the choice is made

The decision between a local repair and a new liner rests on a handful of findings. We record each one and show you how they point toward one option or the other.

Where the findings are mixed, we say so and give you both options in writing.

• How many sections are damaged, and where
• Whether the tiles are still in line and supported
• Whether damage is visible end to end or only in part
• What the flue serves now and will serve later
• Whether a listed repair system fits the flue's condition

Chimneys built without a liner

Some older chimneys were built without any flue lining at all, with smoke rising directly against brick or block. Today's code asks for masonry chimneys to be lined.

An unlined flue is not a candidate for tile repair, because there is no tile to repair. We explain what options exist to line it, point you to the relining service and do not recommend using the fireplace in the meantime. Some unlined chimneys also have thin walls or loose brick inside, which a new liner does not fix on its own. The assessment looks at the masonry passage itself so any relining proposal starts from the real condition.

Repairs to an existing metal liner

A flue that has already been relined with metal can still be damaged. Sections can separate, corrode or be crushed, and the top plate or cap can loosen.

Repairs to a metal liner use parts that match the original listed system and follow its instructions. If parts are no longer available or the liner is badly damaged, we explain the options and point you to relining. The liner's label, usually at the top plate or near the appliance connection, identifies the system so matching parts can be ordered. Without it, we explain how that limits what can be confirmed and repaired.