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Chimney Liner Insulation

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What is Chimney Liner Insulation?
Chimney liner insulation is a high temperature insulation that is designed specifically for metal chimney liners. If your chimney and the flue gases venting through it are able to cool down too much, the result will be the formation of creosote build-up in your chimney liner. Creosote is highly flammable and is the leading cause of chimney fires.

In addition to reducing chimney liner creosote build-up, it will also help maintain a better draft by keeping everything in the venting system warm since hot air rises.

Types of Chimney Liner Insulation
Pour-down mix: There are two types of chimney liner insulation available. The first is a pour-down mix. You simply mix in water and pour the mix around the installed chimney liner. This type of chimney liner insulation is a good method of insulating your chimney liner if you don’t plan on removing the liner later down the road. Because the chimney insulation mix hardens into place it can make it very difficult to remove the liner once its set.

Insulation Blanket: The other type of chimney liner insulation is a blanket wrap. It can withstand temperatures of up to 2100 degrees F. It’s very simple to install and remove from the chimney down the road if needed. Chimney liner insulation wrap comes in a kit consisting of the insulation, wire protective mesh, foil tape, glue, and stainless locking wire.

Do I need to insulate my chimney liner?
You are not required to insulate your chimney liner if you are venting gas or oil, though it is always recommended. It is required to maintain a UL listing when venting a unit that burns a solid fuel, such as wood or coal.

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Chimney liner insulation is also a safety issue when relining a chimney for a wood burning stove. It will keep creosote build-up down, and if there is a chimney fire it will also keep your home safe from the 2100 degree fire burning inside the liner.

If you have the room in your chimney flue you should always insulate your chimney liner. If you are burning wood it is required to maintain the U.L. listing of a chimney liner. If you do not have the room to insulate, please call Chimney Liner Depot and discuss your options. Please do not ignore insulation if you are installing a chimney liner for a wood burning stove.

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    *Note: If you have a terra cotta clay chimney
    flue lining, be sure to measure the true length and width of the
    inside of your chimney flue space.

    *If there is a terra cotta clay flue liner, does it protrude out of
    the top of the chimney at least 2 inches? If there are at least 2
    inches and the terra cotta clay is in good condition, you will use
    our stainless steel, terra cotta top plate that has a 1 1⁄2inch edge
    that goes all the way around (like a shoebox lid).

    *If your terra cotta clay flue is in bad shape at the top, you may
    need to just take a hammer and tap all around that terra cotta,
    taking it away to make the surface flat at the top of your chimney.
    In that case, you will simply use the flat top plate that comes with
    our liner kit.



    *Note: If you have a terra cotta clay chimney
    flue lining, be sure to measure the true length and width of the
    inside of your chimney flue space.

    *If it is on the back of the stove, is it parallel with the back of the stove or is it at an angle, like 45 degrees?

    *If it is at an angle you will use an insert stove adaptor (an insert liner kit) rather than a two-part tee with cleanout cap.


    Usually pellet stoves have an exhaust hole id of 3 inches. However, if you are going up more than 15 feet to the top of your chimney you need to use a pipe and/or flex liner that is 4 inches diameter.





    If you are only venting a hot water heater then the exhaust hole diameter is probably 3 inch diameter. If it is 3 inch diameter and you are going up more than 15 feet to the top of your chimney, you must use a 4 inch diameter flexible liner or ridged pipe for proper draft. We also suggest to go ahead and use a 4 inch diameter flexible liner or ridged pipe even if the total length is 15 feet or less.


    Not the depth or any other dimension inside your fireplace.

    Most gas log fireplaces require an 8 inch liner kit or rigid kit. But do not assume that is the case for the gas log fireplace kit you are installing. Obey the requirements for that specific unit that are in your installation/instruction manual.

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