Chimney Liners / Chimney Relining / Chimney Linings
Every chimney must have a chimney flue liner regardless of the fuel type.Gas, oil, wood or coal, all chimney systems must have a proper liner to ensure safe burning. A chimney liner is necessary for the system to vent properly and remove the carbon monoxide and other by-products of combustion from your home and protect the walls of the chimney. For masonry chimneys, Chimney Specialists Inc. prefers to use the AHREN’s chimney liner technique. This liner not only protects the walls of the chimney, but it also reinforces them. This cast-in-place liner has many benefits that go beyond that of an ordinary liner. No matter what type of liner your chimney has, the important part is that the liner exists and is in good condition.
Types of chimney liners
Clay tiles are the most common type of masonry chimney liners.
Advantages: They are inexpensive, readily available, and perform quite well for open fireplace chimneys that are properly maintained.
Disadvantages: They cannot rapidly absorb and evenly distribute heat during the rapid temperature rise that occurs during a chimney fire, causing the flue tiles to crack and split apart (see the video below). The second disadvantage is that tiles cannot adequately contain the liquid combustion byproducts produced by modern gas appliances.
Metal chimney liners, usually of stainless steel or aluminum, are primarily used to upgrade and repair existing chimneys.
Advantages: If properly installed and maintained, metal chimney liners are extremely safe and durable. Stainless steel is suitable for wood-burning, gas, or oil appliances, while the aluminum is an inexpensive alternative for certain medium efficiency gas applications only. It is usually required that high temperature insulation be used in conjunction with the liners for safety and performance considerations.
Disadvantage: Considerably more expensive than clay flue liners.
National Chimney offers a line of metal chimney liners that have been accepted by CSIA as safe for home use when properly installed.
Cast-in-place chimney liners are lightweight, cement like products that are installed inside the chimney forming a smooth, seamless, insulated passageway for the flue gasses.
Advantage: They can improve the structural integrity of aging chimneys, and are permanent liners suitable for all fuels.
Disadvantage: Challenging installation and could be cost prohibitive.