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Fireplace Chimney Liner

To install a fireplace chimney liner first you need to know what size chimney liner.  The size of the chimney liner depends on the square inches of the fireplace opening.  It does not depend upon the size of the existing flue.

Click here to see exactly what size you need.

All fireplace chimney liners need insulation.  This is necessary for performance reasons as well as safety. Most fireplace chimneys have either a square or rectangle flue.  So when you install a round or oval liner there are going to be some open spaces in the chimney.

You will first need to fill in that gap with some insulation designed for chimneys.  You will want to make the insulation pretty tight in there so it doesn’t fall out under its own weight.  Or you could use a flat top plate on the bottom of the liner to seal up the gap around the liner.

Once you have the insulation in the chimney packed tight around the liner, you will now need to cover it in a refractory cement.  This is a special cement product designed for extremely high heat and can bond metal to masonry.

This may take some time and effort but it is what needs to be done.  You can either coat the entire smoke chamber like this to almost eliminate turbulence and increase draft or you can just make a smooth transition into the chimney liner.

After you finish this step and it dries hard, then you can use the pour down insulation.  For a fireplace many times this is the easiest.

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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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