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Chimney Insulation

When do I need to insulate my chimney liner?
If you are relining your chimney for a Solid Fuel application it is necessary that you insulate the chimney liner with insulation wrap or pour-down mix insulation. In addition to a better running appliance, you get more protection against a chimney fire.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 solid fuels like wood or coal.

Why should I insulate?
When warm gases meet with a cold chimney liner or flue, condensation will form on the interior of the flue or liner. When the by-products of combustion meet with this condensation, as a result creosote is formed. Excessive creosote build-up is dangerous as it is very flammable and increases the risk of a chimney fire.

To guard against this condensation issue, insulating will keep the liner warmer throughout burn cycles. Less condensation will form, resulting in less creosote build-up. If you are venting for a gas appliance, you are not required to insulate though it won’t hurt if you do. If insulating for a solid fuel you should insulate with at least a 1/2in of insulation. Gas and Oil needs only a 1/4in of insulation.

  • $150.94

    Chimney Liner Insulation Kit 6in. x 15ft. – .25in Thickness

  • $169.14

    Chimney Liner Insulation Kit 6in. x 20ft. – .25in Thickness

  • $187.34

    Chimney Liner Insulation Kit 6in. x 25ft. – .25in Thickness

  • $209.08

    Chimney Liner Insulation Kit 6in. x 30ft. – .25in Thickness

  • $228.43

    Chimney Liner Insulation Kit 6in. x 35ft. – .25in Thickness

  • $256.31

    Chimney Liner Insulation Kit 8in. x 20ft. – .25in Thickness

  • $266.39

    Chimney Liner Insulation Kit 8in. x 25ft. – .25in Thickness

  • $285.17

    Chimney Liner Insulation Kit 8in. x 30ft. – .25in Thickness

  • $313.41

    Chimney Liner Insulation Kit 8in. x 35ft. – .25in Thickness

  • $160.46

    Chimney Liner Insulation Kit 6in. x 15ft. – .5in Thickness

  • $175.96

    Chimney Liner Insulation Kit 6in. x 20ft. – .5in Thickness

  • $222.91

    Chimney Liner Insulation Kit 6in. x 25ft. – .5in Thickness

  • $251.18

    Chimney Liner Insulation Kit 6in. x 30ft. – .5in Thickness

  • $280.62

    Chimney Liner Insulation Kit 6in. x 35ft. – .5in Thickness

  • $405.92

    Chimney Liner Insulation Kit 8in. x 20ft. – .5in Thickness

  • $334.37

    Chimney Liner Insulation Kit 8in. x 25ft. – .5in Thickness

  • $384.89

    Chimney Liner Insulation Kit 8in. x 30ft. – .5in Thickness

  • $477.45

    Chimney Liner Insulation Kit 8in. x 35ft. – .5in Thickness








    *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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