Chimney Liners

Also known as “Chimney Relining” or “Flue Liner”.

liners-side-by-side

The Chimney Department are experts in the area of chimney liners and chimney re-lining! The liner is the interior surface of the chimney serving either the fireplace, furnace or water heater, in your home. Chimney liners can be made from stainless steel, clay tile, or aluminum.

An intact, properly sized liner will insure a safe efficient operating chimney/venting system. A chimney should be properly lined and correctly sized for the chimney. It should be acid and corrosion resistant, be insulated, and have a smooth interior surface with no cracks or joints.

Aluminum liners will tend to deteriorate within 10 to 15 years.
The Chimney Department only installs stainless steel liners because they are backed by a lifetime warranty, are UL Listed, and are durable enough to withstand the installation process.

Reasons Why Your Home Needs A Properly Sized Chimney Liner
There are three good reasons why every masonry chimney servicing gas appliances should have a properly sized flue liner.

1. Safety
2. Deterioration
3. Efficiency

While these reasons can be discussed separately, they are also interrelated. As we explore the effects of gas burning/heating appliances (ie: furnaces and water heaters) on chimneys, it will be evident why lining a chimney to correct safety, deterioration or efficiency issues, will also prevent the other problems.

Basics of Gas Burning Appliances

The majority of gas burning/heating appliances today, have an efficiency rating between 70%-80%. These are referred to as near condensation units. Here the dew point usually occurs somewhere in the venting system (meaning the chimney).

The dew point is the temperature at which water is released from gas (and that is defined as condensation). This usually occurs when temperatures drop between 150°-120° degrees Fahrenheit.

Improper sizing of the flue can also effect the draft and cause safety problems. In an over sized flue, the gases cool quickly and down draft conditions may occur. An undersized flue will restrict draft and allow carbon monoxide to accumulate in the home.

Safety

Carbon monoxide is produced by the combustion of natural gas and can be deadly if a chimney liner is deteriorated, improperly sized, or a chimney blockage allows unsafe levels to accumulate in the living space.

Carbon monoxide is a odorless, colorless and tasteless gas, which is very toxic. Symptoms of carbon monoxide poisoning are often mistaken for the flu. Sleepiness, nausea, headaches and dizziness can be a sign of excessive levels of carbon monoxide in the home.

***Please note the NFPA recommends all homes to have a functioning carbon monoxide detector.***

Deterioration Caused by Condensation
Condensation causes deterioration of the tile lined, as well as unlined masonry chimneys. One way this occurs is a result of freeze/thaw cycles. Excessive moisture (condensation) is absorbed into the masonry and can cause brick or tile to spall (when pieces of brick fall off) and mortar joints to crumble when freezing occurs. This is most common toward the top of a chimney where condensation is more likely.

Condensate from gas burning appliances can also be acidic. This acidity accelerates the deterioration

Efficiency of Appliances
Gas appliances are designed to operate most efficiently with the proper draft providing the optimum amount of combustion air. When venting into an over sized masonry chimney, the flue gases cool quickly and lose their buoyancy.

If you need to add or replace a chimney liner, call the Chimney Department for an FREE estimate at 630-584-6620.