Replacing Brick Chimney Lining

With frequent use of the fireplace, it eventually becomes necessary to replace your chimney lining. This is the material that lines the flue within the chimney. It helps to prevent discharge of smoke and combustion gases into the room. The lining also helps to prevent stains on the chimney walls caused by tar and condensate seepage through the chimney walls. When properly installed, lining helps to enhance the performance of your fireplace. If yours is worn out or faulty, it is best to replace it. 

Materials Needed

  • Chimney lining
  • Tee cap
  • Screwdriver
  • Caulk
  • Pry bar
  • Chimney brush
  • Utility knife
  • Hammer
  • Tin snips
  • Ladder
  • Respirator
  • Safety goggles
  • Heavy duty gloves

Step 1 – Sweep the Chimney

Clean the chimney with a stiff brush to clear tar and sooty deposits. Be sure to wear safety goggles and a respirator for the job. This will help to protect your eyes and respiratory tract from damage by the heavy dirt.

Step 2 – Remove Chimney Cap

Mount your roof and get to the chimney. Remove the screws that attach the chimney cap to the chimney. Use a pry bar to pull the flange away from the chimney. Work all round the flange until the cap is loose and you’re able to lift it off the chimney. Clear dirt and adhesion from around the chimney with a utility knife. If yours is an inside mount cap, cut through the caulk at the seam with a utility knife. Pull the cap out of the flue. It helps if you tap all around the chimney cap with a hammer. You can then easily extract the chimney cap.

Step 3 – Extract Lining

Have somebody nearby to help you carry the lining once you extract it from the roof. Reach inside the chimney flue for the lining. Carefully lift it out of the chimney and pass it on to a helper.

Step 4 – Assemble New Lining

It is best to assemble the new lining completely while on the ground. It consists of several pieces of tubing secured together with rivets and cement. Some sections may require to be molded to fit the shape of your chimney. When assembled on the ground then carried to the roof, it ensures optimal safety. Attach the tee cap to one end of the lining. This end will go into the chimney first and reach the bottom of the flue. Wrap the lining with insulation wrap so that the foil side faces outwards. Allow an extra inch of wrap at the seam for overlap. Use metal duct tape to secure the wrap at 1 foot intervals across the seam. Run some more tape along the entire length of the seam, from top to bottom.  Ask a few people to help you transport the lining to the roof.

Step 5 – Install New Lining

Begin with the tee cap end and slowly feed the lining into the chimney. Push it all the way down into the chimney until it is firmly fitted. Work slowly as the lining is rigid and may give way at any of the joints if forced in too quickly.

Step 6 – Attach Chimney Cap

Use tin snips to cut off lining that exceeds 4 inches from the top of the chimney. Attach the lining to the damper and place the chimney cap on top. Secure with screwdrivers or caulk.