Most chimneys are built with the flue being lined with a hard clay material. This liner is the first line of defense to protect your home from the heat, smoke, and other emissions generated by the fireplace or other heating appliance. Its smooth walls also allow the chimney to vent more efficiently. This liner can develop cracks, most commonly after experiencing a chimney fire. The sudden and intense heat causes the clay liner to rapidly expand resulting in cracks. In this condition the integrity of the chimney is compromised and should be relined.
Relining the chimney in most all cases first requires removing the existing damaged liner. The reason is so a new liner of the correct size can be installed in its place. Many times an access hole must be created at the lower end of the chimney in order to retrieve the pieces of old clay liner as they are broken up and allowed to fall down the chimney.
After the old liner is removed, the new liner is installed in its place from the top. The new liner is typically round, made of flexible stainless steel, and must be sized according to the appliance for which it is venting. If the liner is too large or too small the chimney may not vent properly.
In most all cases the liner will also be properly insulated with either a poured type insulation or ceramic type blanket insulation, depending on the situation. The insulation adds another layer or safety to your chimney, allows the chimney to operate more efficiently, and is required by the liner manufacturer for warranty purposes.
|Terry Co. Chimney Sweep||