Chimney Lining


Chimney Lining

Flexible liners

Bespoke Fire Co has years of experience in chimney relining and we use the best quality flexible liners available. We generally use twin wall 316 grade stainless steel double skinned liners, which when properly installed, operated and maintained comes with a 10 year manufacture warranty. We always carry out a test core on each flue before we come to line the flue as we need to ensure what is the maximum size liner that will pass down your flue without obstructions. This way we can advise you on what is the best size opening you will achieve and the options available to you and suitable appliances.

Stainless steel gathers

We always use made to measure stainless steel gather hoods on our installations. They are made from 316 grade stainless steel and will be made to the exact requirements of your fireplace.

We offer a free estimating service for lining. We need to carry out a survey to check access and see if scaffold is required. If scaffold is required then you we are happy to organise scaffolding for you through scaffold companies that we have a good working relationship with.

Multi fuel flexible flue liner

Stainless steel flexible flue liners are designed for lining an existing flue or masonry chimney. Multi fuel flexible is a twin skin chimney liner designed for gas, oil and multi fuel, where the maximum flue gas temperature does not exceed 600°C. There are two grades available, 316L and a higher grade of 904L which is suitable for the extreme conditions found with coal based solid fuel installations.

Product Description


Document J of the Building Regulations requires that a flexible flue liner can only be installed completely enclosed inside a masonry chimney. A non masonry enclosure such as timber or plasterboard boxing in is not acceptable. The type of flue liner permitted depends on the type of appliance and the fuel chosen to be used. Gas and Oil flexible flue liners are manufactured out of single strip 316 grade stainless steel.

There are two grades of multi fuel liner available:

Prior to installation

The chimney should be inspected along with the external brickwork and capping/flaunching for deterioration and if necessary any remedial work should be carried out. The chimney should be swept, preferably by a suitably qualified chimney sweep who will provide a certificate after sweeping and checking, which should be retained for future reference.

Installation of the liner

The flue liner can be pulled up or down the chimney but generally they are pulled down from the roof. lt is recommended that short test section is pulled through the chimney prior to installation in order to ensure the chimney is suitably sized, and free from any obstructions. We would always recommend that flexible liners are insulated to aid the performance of the appliance and chimney system.

Fuels and appliance operation

Only fuels which are HETAS approved or recommended by the appliance manufacturer can be used. If burning wood, then it must be well seasoned for at least 12 months and not be any more than 20% moisture content to avoid creosote deposits building up within the flue way which can cause chimney fires.

If the appliance is slumbered overnight or for longer periods then it is advisable to run the appliance at controlled high fire condition for a period of at least 30 minutes. Prolonged slumbering of the appliance is a contributing factor to a liner failure especially when burning coal based solid fuels. It is important to maintain sufficiently high flue gas temperatures in order to avoid condensate and acid corrosion problems.

Household refuse must not be burnt.


Provision should be made for inspecting and cleaning the liner especially on multi fuel liners for solid fuel applications. The liner should be swept at least once a year by a suitably qualified chimney sweep. Chemical chimney cleaners which contain chlorine, fluorine or metal scarifying devices cannot be used under any circumstances and will invalidate your warranty. At Bespoke we have a viper system which is the best option for cleaning lined chimneys as standard chimney rods could damage the liner.

Life expectancy

Under normal operating conditions and providing the liner is installed correctly by a competent person, flexible liners should last the lifetime of the appliance.


Gas, Oil and 316 grade multi fuel flexible liners carry a 10 year conditional warranty. 904 grade multi fuel flexible liners carry a 25 year conditional warranty. Contact us for further information. The conditions are that the flue liner is correctly sized, installed, and properly maintained, burning only approved fuels in accordance with the appliance manufacturer's instructions.