Creosote, the black or brown residue of combustion that collects on the inner surfaces of a chimney flue liner, is highly flammable. If allowed to build up, it can catch fire, causing cracks in “fireproof” brick, stone or clay flue liners and allow heat to reach nearby wood framing and other combustible materials in your home. A dirty chimney is the cause of many house fires each year.
Have your fireplace cleaning done preferably in late spring or early summer when heating season is over. That way, you’ll have enough time to schedule any repairs you may need before the heating season begins in the fall.