An essential part of any chimney is the lining. It can be an expensive, but necessary item to replace. Most chimney liners will eventually start to deteriorate. This will make it dangerous to use a fireplace. Liners are important for the safe operation of any fireplace. The liner will force heat and gases up through the top of a chimney. It will prevent heat from interacting with any combustible materials around the chimney and causing a fire. When the liner in a chimney is cracked or breaking, it is important to have it replaced before the fireplace is used. A chimney professional will know when a chimney relining is necessary.
Prior to the 1900s chimneys were lined with mortar. After 1900s clay tiles were the standard. Masonry chimneys were tested by the National Bureau of Standards (NBS) during the 1980s. It was determined that any unlined chimney would be extremely unsafe to use.
Reasons For Chimney Relining
A chimney liner will protects masonry from the byproducts of a fire. Tests conducted by the NBS showed that flu gases getting into brick and mortar will decrease the usable life of a chimney. Flue gases are acidic and wear away mortar joints from within the chimney. This can cause a dangerous situation. Toxic gases may leak into the living area of a home. A correctly sized liner will enable a fireplace to operate with maximum efficiency. An incorrectly sized liner can cause excessive creosote buildup in a chimney.
Chimney Liner Types
It’s possible in very old homes for the chimney to not have any form of lining. During the past several decades, chimney liners have been a requirement. They are more effective at channeling heat and gases up the chimney top than those with no liners. Anyone who uses a fire place should make certain that a liner has been properly installed in the chimney before any regular use.
There are situations where a new chimney liner can be built with a process involving poured cement. The benefit to a cast-in-place chimney liner is how it’s able to easily endure the effects of heat, acids and condensation. These liners are effective because of their superior insulation properties. It will be able to help a fireplace burn cleaner. This creates a reduction in the accumulation of creosote in a chimney. A cast-in-place liner is able to last for as long as five decades.
Clay Tile Liners
Clay tile chimney liners are considered to be the most cost effective. When clay tile liners are installed by an experienced chimney professional, they can easily last 50 years or longer. They require regular cleaning to remain effective. Clay tile liners are most effective when installed at the time a chimney is built. It is difficult to retrofit them into an existing chimney. The installation will be very labor intensive.
Metal Chimney Liners
These liners are made with aluminum or stainless steel. Metal chimney liners are commonly used to repair or upgrade an existing system. When these liners are properly installed by a chimney professional and regularly maintained, they are very safe and durable. They can be used with wood burni