Chimney Sweeping

Chimney sweeping is the professional cleaning of soot, creosote, and ash deposits from a fireplace, flue, and chimney structure. In Finland, chimney sweeping is a legal requirement for all fireplaces in active use, with sweeping intervals specified by the rescue services based on fireplace type and frequency of use. The sweep is performed by a certified chimney sweep who also inspects the condition of the fireplace and flue.

The primary purpose of chimney sweeping is fire prevention. Creosote — a tar-like substance that forms when wood is burned, especially at low temperatures — accumulates on the inner walls of the flue. If this buildup ignites, it causes a chimney fire that can reach temperatures of 1,100 degrees Celsius, potentially cracking the flue, igniting adjacent combustible structures, and causing a house fire. Regular sweeping removes these deposits before they reach dangerous levels.

During the sweeping process, the chimney sweep uses specialized brushes, rods, and vacuum equipment to remove deposits from the firebox, smoke shelf, flue liner, and chimney cap. The sweep also checks for structural issues such as cracks in the flue liner, deteriorated mortar joints, blocked cleanout doors, and damaged chimney caps. Any defects are documented in a written report provided to the property owner.

Beyond the legal requirement and fire safety benefits, regular chimney sweeping improves fireplace performance. A clean flue draws better, producing a more efficient fire with less smoke and more heat output. If your fireplace has become difficult to light, smokes into the room, or produces an unusual smell, overdue chimney sweeping may be the cause. Always use a certified chimney sweep to ensure the work meets legal requirements.