Flexible Flue Liner Installation

Hire a qualified chimney cleaning professional to safely remove soot or other compounds from the chimney before installation. Have the chimney inspected for any flaws or damage, and have it repaired before installing the flue liner.

Climb a ladder onto the roof and feed a length of rope down through the chimney to the inside top of the fireplace opening. Hold it taut and make a marker mark on the rope just inside the chimney. Pull the rope back up and measure the length with a tape measure to know how much liner is needed for the chimney.

Remove the chimney pot by using a chisel and hammer to knock out some of the mortar holding the pot in place in the chimney. Wiggle it slightly to free it from the contact, pull it out and set it aside for re-installation later.

Wrap thin insulation sheets around the flue liner and tape it with thermal tape. This helps improve updraft in the chimney and reduces the risk of condensation forming in the shaft.

Carry the flue liner into the house and place it in the room with the fireplace. Feed the rope back down the chimney through the top and down into the room. Tape the rope to the outside of the liner with duct tape so that it won't pull free.

Fold approximately 1/4 inch of the liner inward upon itself with pliers to round the edge slightly so it doesn't catch inside the chimney.

Pull on the rope carefully from the roof while an assistant slowly feeds the liner up the chimney. Work together if the liner snags at all to wiggle it or pull it back down slightly, then resume. Lift the liner a few inches out of the top of the chimney and trim it with tin snips so it fits just below the inside edge. The liner fits snugly and takes some effort to pull into place.

Place the chimney pot back on the top of the chimney and spread mortar with a putty knife around the edge of the pot and brick to secure the two together. Allow the mortar to dry for at least 24 hours before using the fireplace.