Chimneys are an important part of your homes heating system. There are several components to a masonry chimney- each with an important role in the performance and function of the chimney. One of the most important is the flue liner. The National Fire Protection Agency NFPA 211 states that all Masonry Chimney Flues must be lined.
What is a Flue Lining? A liner is a clay, cast concrete or metal conduit installed in a chimney to contain combustion products and direct them to the outside. They are also to protect the chimney walls from heat and corrosion.
Reasons to Invest in a Liner
- Unlined Chimneys allow heat to move through brick chimney walls very quickly.
- Unlined Chimneys could cause adjacent woodwork to catch fire.
- If gases were able to penetrate brick and mortar the mortar could deteriorate.
- Flue liners are able to contain flue gases and minimize condensation - this will help prevent creosote buildup.
- Flue liners often put an end to a smoking fireplace or downdraft.
- A liner will improve your chimneys draft because hotter gases draw better than colder gases.
- Peace of Mind- Knowing your family, house and belongings are protected from dangerous carbon monoxide and potential fires.
- Safety- Lined chimneys will prevent gases and sparks from entering your home.
- An affordable alternative to repairing or rebuilding the chimney and much easier to clean.
What kind of Liner should I get?
The three main types of chimney liners are: Metal, Clay and Cast-in-Place.
Metal liners- made from Stainless Steel or Aluminum and a used to repair of upgrade an existing chimney. Stainless steel is appropriate for gas, oil, or wood burning systems while Aluminum is used for a medium efficiency gas system.
Clay liners- the most common type of chimney liner. It is inexpensive, easy to find, and works well in an open chimney system. However, it does not swiftly absorb or evenly distribute heat in a chimney fire. Unequal growth may cause flue tiles to fissure or split. Clay tiles cannot hold liquid byproducts of combustion from modern gas systems.
Cast-in-Place liner- a lightweight, cement-type product. It is cast able and installed inside a chimney to offer flue gases with a seamless, insulated passageway. This permanent liner can advance the structural integrity of a mature chimney.
