How to determine if a reline with a chimney flue liner is needed:
- The current terra cotta chimney flue liner is missing or damaged.
- The cross sectional area of the flue of a chimney venting solid fuels with no walls exposed to the outside below the roof line is more than three times the cross-sectional area of appliance flue collar.
- The cross-sectional area of the flue of a chimney venting solid fuels with one or more walls exposed to the outside below the roof line is more than two times the cross sectional area of appliance flue collar
- There are hairline cracks in the flue tiles or mortar missing between the flue tiles.
- The system has a history of repeated excessive creosote buildup.
- Deemed necessary by the appliance manufacturer.
Before making a chimney repair with a new chimney flue liner read this:
Consideration should be given to determine whether the chimney is a good candidate for relining with a stainless steel chimney flue liner. A thorough inspection must be made of the general condition of the chimney. Loose or deteriorated mortar and cracked or missing bricks should be repaired.
Care should be taken to locate and close any holes not being used as a thimble. The chimney should be thoroughly cleaned of tar glazed creosote, debris and other obstructions. Only one coal or wood burning appliance should be connected to a single chimney flue. Do not connect a wood burning appliance to any flue venting a gas fired appliance.
NFPA 211 requires that the chimney be at least 3 feet higher than the point where it passes through the roof and at least 2 feet higher than any part of the roof within 10 feet measured horizontally.