Directions for Repairing a Chimney Flue Liner

One of the most important parts of your chimney is the liner located within. Should it become damaged or just worn out it can leak fumes into the home. It may also deposit creosote on the inside walls of the chimney causing blockages leading to very real fire hazards in your home.

Items Required for Repair:

• Work Gloves


• Roofing sealant


• Screwdriver


• Utility knife, hack saw or tin snips


• Hammer and chisel


• Ladder to get on the roof


• Liner replacement


• Connector screws


• Eye protection


• Dust mask


• Helper


• Plastic liner or cloth cover for room

1. Wear eye protection and a dust mask to protect from soot/ash particles.


2. Place a cloth or plastic cover in the room around the hearth for preventing soot and ash stains.


3. Loosen the termination connector to the liner in the hearth. It will be where the liner attaches to the hearth before going up the chimney.


4. Undo the top plate from the flue liner and the top of the chimney on the roof. If it is mortared you will have to hammer and chisel it off.


5. Cut off the sealant and remove the top plate. Remove the liner from either the roof or the hearth; whichever you feel is the easiest and safest way to go.


6. Take out the damaged section by either cutting it out or unscrewing the section entirely. If the liner is a flexible type, replace all of it rather than trying to make repairs.


7. Measure and cut the replacement piece to fit. The new part should be the same material, gauge and width as the old one to fit properly.


8. Attach the replacement section to the old liner with screws in both of the seams.


9. Put the liner back into the chimney the same way it was removed.


10. Replace the top plate back into place and reset with mortar or sealant.


11. Re-attach the bottom termination connection in the hearth to the bottom of the liner and your repair will be complete.