Flue liners for woodburners are an essential component for any chimney, because they prevent fumes and smoke from penetrating other parts of a property.

Typical flue liners are made from materials whose sole purpose is to prevent substances from getting outside of the chimney passageway.

Apart from smoke leakage, other signs that a chimney is lacking a functioning flue liner include stains on either the inside or outside of a property, according to the National Association of Chimney Engineers.

This is one of the more common problems with dysfunctional flue liners for woodburners.

Flue liners can also solve problems with cold chimneys, which may not be drawing up fumes from a fire properly.

Opting for a twin wall insulated flue may be appropriate in these cases, but it is always advisable to consult a qualified professional prior to making a purchase, as they can assess requirements on a case-by-case basis.