CHIMNEY FIRES

(Page 5 of 5)

January/February 1988
By the Mother Earth News editors 
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There are three main hazards during a chimney fire. First, combustible materials near the chimney could catch fire from the radiant heat of the chimney. If the system has proper clearances, this is unlikely. Second, pressure may build in the chimney to the point where fire is forced out through cracks. This shouldn't be a problem in a chimney that's in good condition. Third, sparks from the top of the chimney may ignite roofing materials or nearby vegetation. A spark arrester screen will stop larger solids from coming out the top of the chimney, but the screen will have to be cleaned frequently during the burning season.

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The Aftermath

Once the chimney fire is dead and the chimney has cooled, the system should be thoroughly inspected for damage. The firefighters you called to put out the fire will probably be glad to do this post mortem for you and make recommendations.

At the least, replace any black-metal or galvanized connectors that became so hot they glowed. High temperatures initiate rapid deterioration in these non-stainless steel parts. Stainless steel insulated chimney comes in two grades, UL103 and UL103HT. The latter is rated to 2,100°F and is better able to withstand the stress of a chimney fire. Either type should be inspected after any flare-up. Look for wrinkling of the inner jacket and looseness in the joints.

In masonry chimneys, search for exterior cracks, leaks in joints, chipping or cracks in tile liners and deterioration at the thimble (where the stove connector enters the chimney).

For most wood burners, chimney fires aren't just possible; they're inevitable. Neophytes are often caught quite by surprise the first time, and few shrug off the experience lightly. A full-scale chimney fire makes an unforgettable impression. Here's hoping you'll have the opportunity to avoid the second one.

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  • jack 11/29/2007 7:20:11 PM

    I used a flare type to put out my chimney fire.. worked great. But
    now I cann't find any one that sells them .. could you help- Thanks
    , Jack

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