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These liners are made by Isokern from pumice which is a volcanic rock that has amazing resistance to high temperatures and exceptionally good insulating properties, which is just what you want for a flue liner.
They are also CE marked and included in the HETAS list of approved products for use with solid fuel and wood burning appliances.
They are lowered down the chimney in the same way as the rigid metal liners and then surrounded with a lightweight leca insulating concrete backfill.
It is important that the flue in the chimney is big enough to accommodate the liners and at least 25mm thickness of backfill. If bends have to be fitted inside the chimney it is usually necessary to cut an access hole through the chimney walls and then make good afterwards.
Many people in the trade consider these liners to be virtually permanent and ideally suited for wood burning stoves. These liners are usually best installed by qualified chimney engineers.
These liners can also be used to build new chimneys, and we carry large stocks of the most popular diameters.
More details are given in the Isokern chimney relining leaflet and the main Isokern chimney brochure below.
Redbank Concrete Flue Liners
Flue liners are used to build what is commonly called a "traditional chimney" and are usually made from clay or heat resistant concrete.
A typical chimney construction would start with the liners being supported on a suitable lintel or gather if being used above an open fire. The liners are jointed using a flue jointing mortar mix, then surrounded by a minimum thickness of 100mm brick, block or stone work. A minimum gap of 25mm must be kept between the outside of the liners and surrounding masonry, and backfilled with a standard insulating concrete mix.
A choice of gathers bends and chimney pots are available.
We stock the Red Bank concrete flue liners which are a good choice for use with open fires. They are available in a range of round, square and rectangular flue sizes. The 200, 250mm and 300mm square flue liners are popular for open fires and the larger rectangular liners can be used for inglenook type chimneys.
We also stock the Isokern pumice concrete flue liners that are ideal for chimneys being built for use with wood burning stoves.
For more Information please download a brochure:
We can help with ideas and answers for almost any situation, so please call us. Our friendly technical sales team are also HETAS registered, so you can be sure of a professional and enthusiastic service.
A few words about Building Regulations It is a legal requirement that all chimney installations comply with the Building Regulations, which for England and Wales is explained in the Approved Document J. These are minimum requirements aimed at making sure installations are safe. There are also Planning Permission requirements, which are explained on the Regulations page.