Why Insulation in a Chimney?

Creosote Prevention

• Chimney insulation helps prevent the buildup of creosote, or soot, a black dust that can form crunchy or tar-like layers on the inside of chimneys. Smoke contains soot that is left on the walls of chimneys as its temperate rapidly cools during the exhaust process. Insulation helps maintain high temperatures within an entire chimney. This prevents smoke from cooling rapidly as it rises from the chimney, thus preventing smoke from leaving creosote on the walls of the chimney. Creosote hinders the exhaust and draft processes and presents a serious fire hazard.

Draft Improvement

• Lining chimneys with the same insulation that prevents creosote buildup can also improve draft. A draft is a directional breeze that carries smoke away from a fire, up the chimney and out of the home. The physical properties of warm air cause it to rise rapidly, thus aiding draft. If the temperature in a chimney drops drastically as air rises, it becomes increasing difficult for the air to rise. Maintaining high temperatures within the entire chimney ensures rapid and constant draft. This prevents smoke and other toxins from lingering in the chimney, entering the home or causing creosote buildup.

Saving Energy

• Some chimney insulation materials exist to save you money and reduce carbon emissions. This type of insulation is designed only for unused chimneys. If your home contains fireplaces you never use, you can install insulation that effectively blocks airflow within the chimney. In the winter, this prevents cold air from leaking into a home and prevents warm air from leaking out. During summer months, this type of insulation helps keep cool air in the home while preventing the warm outside air from entering. All of this lowers heating and cooling costs and reduces carbon emissions.

Additional Information

• The type of insulation that improves draft and prevents creosote buildup creates a smooth, flat surface within the chimney. This surface is easier to clean than brick or other stones used in chimney construction, saving you time or money by not requiring a chimney sweep. Always check local building codes and laws before insulating a chimney. If you violate a local law or code, the municipality can fine you or force you to remove the illegal material.