Fireplace Builders / Installers / Wood Burning Stove Installations
While Chimney Genie installs a full line of wood burning stoves, custom fireplaces and new chimney’s the most common situation we come across is that of poorly maintained and functioning chimneys. With any new installation or wood burning stove we recommend a complete inspection of the existing chimney work…. Do you know what type of chimney liner you have? Many homes have a terra cotta flue tile liner. While these liners are very effective as heat insulators they are also very brittle and usually crack when they are exposed to thermal shock.
National Fire Code 211 (NFPA 211) recommends these liners be repaired or replaced when they crack. And while terra cotta flue liner tiles can be replaced, a better and more efficient way to correct the problems that a damaged chimney liner can lead to is to install a stainless steel chimney liner.
Many stainless steel liners have lifetime warrantees and can effectively handle the thermal stress of chimney fires while protecting against the corrosive by-products of various heating fuels as well as the damaging effects of weathering.
The experts at Chimney Genie are experienced in inspecting, replacing and repairing chimney liners. According to Fire Code Regulations:
Metal liners may be stainless steel, aluminum, or galvanized iron and may be flexible or rigid pipes. The stainless steel liners are made in several types and thicknesses. Type 304 is used with firewood, wood pellet fuel, and non-condensing oil appliances, types 316 and 321 with coal, and type A1 29-4C is used with non-condensing gas appliances.In addition, the stainless steel liners must have a cap and be insulated if they service solid fuel appliances. The code goes on to discuss Aluminum and galvanized steel chimneys for as class A and class B chimney applications. Class A are either an insulated, double wall stainless steel pipe or triple wall, air-insulated pipe often known by its genericized trade name Metalbestos. And the Class B are non-insulated double wall pipes often called B-vent, and are only used to vent non-condensing gas appliances. These may have an aluminum inside layer and galvanized steel outside layer.Condensing boilers do not need a chimney.
Finally the codes discuss concrete flue liners that are like clay liners but are made of a refractory cement (cement that is laying and bonding products such as bricks) and are more durable than the clay liners. Poured in place concrete liners are made by pouring special concrete into the existing chimney with a form. These liners are highly durable, work with any heating appliance, and can reinforce a weak chimney, but they are irreversible.