When To Use Rigid Chimney Liners

There are many reasons to choose rigid chimney liners. The products come in many diameters and lengths, to meet a variety of needs. Protectors also come in different grades, to accommodate the different types of fuel that may be burned in the hearth or stove. The protectors are designed for all fireplaces that are made of clay or stone. While there are clay protectors, such flues often deteriorate over time, requiring them to be replaced.

The flue or inner protector inside the chimney offers protection from the leaking of toxic gases, into the home. It also provides a solid exhaust route for burning wood, gas, oil or other fuels. Because the flue is so important, it should not have any gaps, cracks or faulty seams. It needs to have an airtight seal within the inside of the stone vent. Clay liners are suitable, if they are in good condition. However, newer options include metal alloys, aluminum and stainless steel, which can last quite a long time. Steel tubing can be used inside clay tile, if it is determined to no longer be sufficient.

The difference between flexible and solid tubing is fairly straightforward. Flexible tubing is used for vents that may not be straight or have some curves. Sharp corners in solid tubing can be more difficult to clean. Solid tubing is used for fireplaces and stoves with straight vents, usually with a length of twelve feet or less, as it must be assembled as each additional section is fed into the vent. Flexible chimney liners are much easier to install, as they come in one long section.

When installing the tubing, it is wise to use insulation as well, which offers additional protection from creosote build up. Insulation helps to keep the exhaust moving in the right direction and helps the flue stay cleaner, for a longer period of time. Measurements are taken at the top of the vent, by measuring the inside diameters. Measurements for the lower end, where the heart meets the vent, should also be taken.

For wood burning fireplaces, a lower grade steel or alloy is more suitable. If fuel oil or gas is used, a heavier gauge metal should be used, to prevent leakage from inside the vent. Solid tubing is less costly than flexible tubing. However, it may cost more for installation, especially if lengths greater than twelve feet are used. When sections are put together, they are usually attached by screws or rivets. Rivets are recommended, as screws can sometimes work themselves loose. A sleeve at the top of the vent is usually required with rigid chimney liners, as they will expand and move, as they get hotter.

Prices for tubing will vary, depending on length and grade of metal. A typical 304 grade for wood burning hearths will cost about $25 for a one-foot section, in a five-inch diameter. The same section used in gas and oil burning, costs around $30 for one foot. Additional supplies such as screws, rivets and caps are usually purchased separately.

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