Do not buy until you talk to us! We can save you cash! 1-866-941-5112

Rigid Chimney Liner Vs Flex Chimney Liner

Categories: Tags:

Rigid Vs. Flex

As you have researched for your purchase of a chimney liner, you have encountered a rigid chimney liner and a flex chimney liner.  What chimney liner do you need?  Obviously you do not want to spend extra money if it does not bring much of a benefit.  We will answer 4 questions.  When would you use a Rigid chimney liner?  What benefits does it have?  When would you use a Flex liner?  What benefits does it have?

rigid chimney liner

When would you use a Rigid Chimney Liner?

You would use a rigid chimney liner when you want the BEST.  You would also want use rigid when you are using it for a solid burning appliance (wood, coal, pellet) that is your main source of heat.  One requirement is that your chimney be straight, free from bends.

What benefits does a Rigid Chimney Liner have?

A rigid chimney liner is strong.  You have the peace of mind that you have the best chimney liner on the market inside your chimney protecting you and your family from harmful fumes and a chimney fire that can be contained inside the liner.  Also, when you have a wood stove you want the best draft possible with as little creosote build up.

The rigid is a perfectly smooth inner wall.  Click HERE to learn how a smooth inner wall benefits you.  Rigid chimney liners can take a very aggressive cleaning, which means when you are done cleaning there should be absolutely nothing left in terms of creosote.

When would you use a Flex Chimney Liner?

You would use a flex chimney liner when your chimney has bends in it.  The flex is your only option in this case.  But there are a few styles of flex liners available.  This page will describe the difference between two of them.  If you have a gas furnace, this will not create creosote, so a flex liner may be sufficient in your case.

What benefits does a Flex Chimney Liner have?

A Flex chimney liner is light weight and easier to install than rigid.  The price is cheaper up front.  It will bend around fireplaces and easily connect to a fireplace insert.

How To install Flex Chimney Liner

Rigid chimney liner is the best.  But if for some reason it will not work in your case, seriously consider what style of flex liner you will need.  All our chimney liners and components are made from stainless steel.  If you can, use rigid chimney liner, it is the way to go.

Follow us on Facebook to see the latest offers and sales on rigid chimney liner kits.  facebook








    *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.