At the starting of the discussion, we must understand what chimney lining is. The liner is actually the channel that lets the gas and smoke to pass through. The liner is located inside the chimney. It is a separate unit of the chimney fabrication. The chimney’s inside is required to be covered with a non- combustible lining that allows the poisonous hot gases and dust particles generated by the stove.
The chimney lining can be made up of casted masonry material, stainless steel, aluminium, and clay tiles. You have to be sure that the channel that the chimney is given an opening through should be free of holes and cracks. Otherwise, the tiny particles may enter into attics, chimney walls, and ceilings. Defects in chimney liners can lead to serious problems.
Let’s discuss the types of chimney liners:
Tile liners: A tile liner is best suited for short and straight chimney. It provides more economical solutions and is very popular with the new constructions. In many older homes having masonry chimneys, clay tile liners are found. But, if the older tiles get worse, retiling can be quite troublesome.
Aluminum liners: Specific kinds of gas appliances use aluminum liners that are almost identical to the configurations of stainless steel ones. Unfortunately, these liners are not accurate for most of the wood-burning fireplaces and common applications.
Stainless Steel liners: Many wood stoves and furnaces need stainless steel liner for meeting the recommended venting necessities. One can insert around steel liner down the chimney. It also serves the purpose of the flue pipe. The rigidity and flexibility of the material depend on the specifications of the specific chimney. These liners can tolerate extreme heat.
In the chimney industry, the newest technology is named as the Stainless Steel Smooth Wall Chimney Liner. It amalgamates the use of the flexible chimney liner with the upgraded performance of the rigid chimney liner. It is a bit expensive. It provides at least 20% more flow or draft than the standard flex liners.
The chief functions of the chimney liners:
It protects the home from the transfer of heat to the combustibles. The unlined chimneys permit the heat to move through the chimney so fast that the adjoining woodwork catches fire in three and a half hours. So, a lining is a must.
It saves the masonry from the erosive by-products of combustion. The flue gas is acidic and corrodes the mortar joints from the chimney’s inside. As a result, heat transfers very fast too the adjoining combustibles. Poisonous gas like carbon monoxide enters into the rooms causing harm to the members.
The chimney liner provides an accurately sized flue for the appliances’ ultimate efficiency. The modern wood stoves and oil/gas furnaces need the right sized flue for flawless performance. The chimney is liable for allowing the combustion products a passage out of the building. Again, the draft that is produced by the chimney supplies the combustion air to the specific appliance.
An improperly sized chimney liner can generate excessive creosote build-up in the wood-burning stoves. Further, the production of carbon monoxide will be increased.
How can you understand that the chimney lining is suffering from the problem?
If the draft is lowered in the chimney, it won’t be able to draw the smoke out of the house. If you find any foul smoke, it indicates a trouble. If you find out that your fireplace is smelly, it can be because of the soot and creosote build-up. It may be due to defective liner too.
Maintain your chimney properly. Timely cleaning and repairs extend the chimney’s life and you can save a lot of money needed for drastic fixes. The sulfur present in the soot becomes wet and becomes extremely vulnerable to corrosion resulting in creating holes in the liners. A right cap can prevent the damage to a great extent. The clay linings can generate chips and flakes and hence, cracks develop.
Call an inspector to find out the condition. Then, appoint a certified chimney sweep to fix the errors. Never call a fuel person or a heating contractor as they are not the right professionals to do the needful.
The National Fire Protection Association ( NFPA) code calls for the masonry chimneys to include a liner.
The requirements of the chimney lining:
If you are opting for a new appliance or a furnace, be sure that the installed liner matches the venting output needs of the specific system. Several times, an old or damaged chimney can be repaired from the inner portion just by installing a new liner. Natural causes like wind, long usage, etc. may damage the chimney. Lining may be the right solution for these cases.
Most of the times, failed lining is the major cause of the chimney fire. Many older chimneys have no proper lining and these are needed to be upgraded. Chimney lining can resolve several destructive conditions and the chimneys will remain in good condition for longer rendering first-class performance.