What causes chimney fires?
Chimney fires are usually caused by the accumulation of creosote in the chimney. Creosote is a natural by-product of burning wood. It accumulates in the flue over time and is highly flammable. Creosote is especially likely to accumulate when wood is not burned at the proper temperature. Since creosote is flammable, when it accumulates on the walls of your flue, hot flue gasses can ignite it. The result is a chimney fire. Depending on the condition of your chimney, such a fire can pose a significant threat to the rest of your house. Flames from the fire can find their way through cracks in your clay chimney liner or mortar and ignite framing around the chimney. They can also spill over onto the roof and cause a fire there.
