What's involved in a flexible chimney liner installation?

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buy chimney linersA flexible chimney liner installation always begins with an inspection of the existing masonry chimney. Sometimes a thorough cleaning of the chimney needs to be done prior to the installation of the chimney liner to clear any obstructions. It's very important to install the correct size liner. You will have problems if you install a liner too large or too small.

Most flexible liner installations are done from the top of the chimney down, however it is also possible to do the flexible liner installation from the bottom up. It all depends upon each unique situation and the preference of the installer. Sometimes the liner may need a little coaxing to get it all the way through the chimney, but its flexible nature allows for quite a bit of contorting. The trick is never push, always twist the liner and sometimes it may be necessary to pull the liner down with a rope and a pulling nose cone. Depending on the type of application you have, the instructions for the chimney liner installation will vary slightly. In this article you will learn the basic instructions for installing a flexible stainless steel chimney liner.

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Step by step installation instructions

Preparing the liner for installation CAUTION: Metal edges can be sharp. Be sure to wear protective gloves when handling the liner and liner components. Also make sure your chimney has been cleared of all debris before installing the liner.

1. Remove the liner from the packaging and straighten it out on a flat surface.

2. Attach the bottom termination connector (tee or other appliance connecting device). Tighten the hose clamp of the connector to the liner. Do not over tighten.

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Installing the Liner

1. Make sure you have the available manpower in order to handle the liner. Always take safety precautions when doing any work on the roof.

2. Some installations may require you to use a rope connected to a pulling cone or directly to the bottom connector. A second person may be needed to pull the rope from the bottom of the chimney while the person on the roof guides the liner down the chimney.

3. Keep the chimney liner centered in the chimney opening to avoid causing damage to the insulation and/or chimney liner.

4. Once the bottom connector has been connected, now install the top plate. Slide the top plate over the liner and pull up on the liner to remove all the slack and tighten the top plate to the liner. Once the top plate is secure you can now cut off the extra liner with either tin snips or a hack saw. Add a bead of silicone under the top plate to keep the top plate in position.



Completing the bottom termination

1. Locate the point where the connector pipe will pass through the chimney to the tee body.

2. If insulated, cut away a hole in the insulation and mesh where the tee snout will connect to the body of the tee.

3. Secure the snout to the body of the tee using the attached metal band which wraps around the backside of the tee body.

4. If insulated, wrap the snout of the tee with insulation.

5. Fill in the hole around the snout with brick and mortar.

6. Complete your connection to the heating appliance following all applicable codes. More on the two part tee

Completing the top termination

1. With the bottom connector in place, put a heavy bead of silicone caulk around the chimney crown or top of clay flue tile. Place the top plate over the liner and press firmly into the caulk.

2. Tighten the hose clamp band around the liner. This secures the liner to the top plate. Optional: Top plate flashing has four pre drilled holes which can be used to tap-con the top plate to the crown.

3. Install the cap by fitting it over the collar of the top plate. Tighten the hose clamp band of the cap onto the top plate collar. Your top termination is now complete.

More on the Top Plate.

NOTE: If the application allows, the liner should be insulated. This is a step that is often avoided, but is a good idea. An insulated chimney liner will allow for the liner to get heated properly which allows for a better draft.

More on insulation

Learn more about Chimney Liners

Why do I need a Liner?

How to install a pellet stove.

How to install a wood stove

How to install a wood insert

How to install a coal stove

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