Q&A Why do clay flue liners crack?

QandA Posted By QandA, Dec 30, 2002 at 2:20 PM

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  1. QandA

    New Member 2.
    Staff Member

    Nov 27, 2012

    > I am requesting as much information as possible on the reasons why clay flue liners crack. I'm a fire investigator for Donan Engineering and occasionlly I have to evaluate the possibility of a creosote fire in a fire place.


    Clay flue liners can crack for many reasons. Many of the chimney sweeps

    that I meet tell me that MOST of the flues they clean are cracked.

    I'd suggest the #1 reason is the inability of them to allow for expansion

    and contraction. Some of this is the flue liner itself, another part is

    the installtion of the liners.

    Another reason is the settling of the chimney structure.

    When it comes down to it, todays standard flue liners are actually a poor material for a
    chimney...but the use of them has continued for more than a century.
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