Winterizing your chimney

Do-it-yourself tips for eliminating creosote, soot

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As winter approaches, one of the things to look forward to is the cozy heat and intimate glow that can come only from a wood fire. But burning wood can create some definite safety hazards if you don’t keep up with regular fireplace and wood-stove maintenance.

The real culprits are soot and creosote. Creosote is a thick, oily material that results from the distillation of wood smoke, which then solidifies as it cools. Soot is basically particles of partially burnt material, which builds up in masonry chimneys and metal flue pipes alike, as well as in the flue cap.

The build-up of soot and solidified creosote will eventually clog the interior of the flue or chimney, creating a very serious fire hazard. If the temperature in the flue reaches a high enough level, the creosote will ignite, causing a flue or chimney fire. The fire can break through any weakened masonry or loose flue pipe joints, and from there enter the house or the attic. Sparks and flames can also easily get outside of the flue cap, where they can ignite wood roofing materials as well as dry leaves or needles on the roof or on the ground around the house.

The solution is regular chimney cleaning. You can do this yourself by simply removing the flue cap and cleaning the interior of the flue or the chimney with a wire or nylon brush made for this purpose. The loose soot is quickly knocked down into the fireplace, and the stiff bristles of the brush will remove the creosote buildup.

In addition to the cleaning, you want to do a thorough inspection of your fireplace or woodstove, as well as all its components. Check that the flue cap is solidly in place, and that the spark arrestor screen is in place and undamaged. Check the masonry and grout for cracks or other damage. Examine the joints between the flue pipe sections to see if any are loose or are showing evidence of smoke leakage. Check all the flashings between the chimney or flue and the roofing. Also, go ahead and remove any buildups of leaves or needles off the roof, and trim back any dangerous overhanging branches. …CONTINUED