Chimney Liner

Chimney linerWhat is a chimney liner?

A chimney liner is the material that separates the flue of the chimney from the interior walls. Its role is to prevent the combustible by-products produced by fires from setting your chimney aflame and destroying your house. Because the chimney flue contains highly combustible material — particularly if coated by excessive amounts of creosote — a chimney liner is an indispensable aspect of your chimney. With adequate chimney lining, your chimney won’t overheat and be susceptible to corrosion.

The most common chimney liners used in modern homes are metal flue liners, which are manufactured in several different shapes and sizes. Metal flue liners are most effective, long lasting, and relatively inexpensive.

Chimneys that were built without flue liners should be lined for your family’s safety.

Main functions of a chimney liner

The chimney liner protects your house from the heat radiating from the fireplace or flue.

Creosote formation is the unavoidable by product from burning wood. The danger with creosote is the 450°F ignition point. Consider the average wood stove produces gases leaving your fireplace at 300°F to 900°F, which can ignite a chimney fire of up to 2100°F.

The chimney liner protects masonry from corrosive byproducts.

Research and testing have determined that if the flue gases were allowed to penetrate to the brick and mortar, the result would be a reduction in the usable life of the chimney. The flue gases are acidic in nature and literally eat away at the mortar joints from inside the chimney. As the mortar joints erode, heat transfers more rapidly to the nearby combustible and dangerous gases such as carbon monoxide, which can leak into the living areas of the home.

How do I know if I need a new chimney liner?

Swept Away Chimney professionals provide you with a picture of the interior of your chimney to assist you in determining if it’s time for a new liner.

Reasons to reline:

  • Repair damage to the chimney, which may have been caused by a chimney fire, weather, i.e. lightning strike, or for settling.
  • Upgrade old chimneys which were constructed without chimney liners.
  • Replace worn, deteriorated liners, which may be allowing smoke, creosote or condensation to seep through the chimney walls.
  • Properly size the chimney for a new appliance such as converting from oil to gas heat.
  • Prevent excessive creosote buildup (and risk of a chimney fire) when venting a woodstove through an existing fireplace.