Flexible Flue Liners

Over the years we have we have lined hundreds of chimneys and supplied literally miles of flexible liner. This has given us the opportunity to see how the different makes of liner stand up to the stresses and strains of being pulled down a chimney and how the flexible flue liner reacts to being subjected to continuous high temperatures with occasional bursts of very high heat. It also gives us the opportunity to see how the flexible flue liner puts up with being in a damp chimney and how it copes when unseasoned, tar filled wood or high output cokes and coal are burnt. We have subjected the various chimney liners to other tests as well, such as how quickly will the inner skin of the flexible liner crease when the liner is curved, thus compromising its integrity (and you won't see that from the outside of the liner).

Our flue liner comes with a ten year warranty, C.S.T.B. approval and has been tested up to 1000 degrees centigrade.

The liner fittings that we use are made of decent thickness stainless steel and well designed. The design of the flex pipe adaptor, for instance, ensures that even if damp wood is burnt, potentially leading to an excess water/tar mix running back down the flexible chimney liner, it will end up back in the stove, with no chance of it spilling over from the fitting. The same can't be guaranteed with many of the cheaper alternatives.

As well as the standard 316 grade stainless steel chimney liner that is used in most domestic applications we can also supply 904 grade stainless steel chimney liner. This is normally used in situations where the liner will be subjected to very high temperatures or heavy condensate formation. The 904 grade carries the same 10 year warranty (full details are available on request) as 316 grade.

Flexible liner system designs: our flue designers can design your chimney liner system for you providing you with everything you need to line your chimney and install your stove. This is a free service - simply fill in our: Flexible chimney liner application form

125mm systems - building regulations advise a mimimum flue size of 150mm and HETAS installers may not fit or connect to a 125mm system. Read more about 125mm flue systems here.

You should also read our online guide how to line a chimney with a flexible flue liner.

Flexible flue liner
Product	125mm	150mm	175mm	200mm
STAINLESS STEEL FLUE LINER
904 GRADE LINER	£52.00	£62.00	£69.75	£75.00
316 GRADE LINER	£28.75	£34.75	£40.50	£46.50
ADAPTOR FOR FLUE PIPE
GATHER ADAPTER			£101.25	£101.25
MASONRY LINER ADAPTER	£59.00	£64.25	£69.00	£73.00
ADAPTER REDUCER	£59.25	£59.25	£59.25	£59.25
FLEX PIPE ADAPTOR	£39.25	£39.25	£49.50	£53.50
FLUE LINER FIXINGS AND COMPONENTS
BOTTOM SUPPORT BRACKET	£26.00	£26.00	£26.75	£27.25
TOP PLATE	£30.00	£30.00	£30.00	£30.00
TOP CLAMP	£17.50	£17.50	£25.00	£26.00
TOP INSERT	£21.00	£21.75	£25.50	£27.50
STAINLESS RAIN CAP FOR FLEX	£70.75	£71.75	£76.75	£85.50
ALUMINIUM NOSE CONE AND CORD	£24.50	£24.50	£24.50	£24.50
FIXING STRAP FOR POT HANGER	£7.50

This all stainless steel pot hanger cowl comes in a terracotta finish. The stainless cowl has a birdguard and is suitable for all fuel types. Under the cowl a male spigot fits inside the liner (you do not need to use a top insert with this cowl) and three straps are fixed around the liner with a stainless jubilee clip. For a really belt and braces job we recommend drilling a pilot hole through the straps and using a short stainless steel self tapping screw to provide an extra fixing. The stainless cowl is fixed to the chimney pot with three straps and a jubilee clip and can come in a size suited to 125mm or 150mm flexible liners. The stainless jubilee clips are included in the price.

The pot hanger is designed for quick installation of class I flexible chimney liners, since it enables the job to be done without removing the existing chimney pot and flaunching.
It is still possible to insulate the liner using chimwrap and in certain situations where it is possible to push up rockwool sleeves from below. The great advantage of using a pot hanger is when lining very small chimneys or chimneys made of terracotta liners.

The pot hanger is a two part component comprising of the hanger itself, a rain cap to stop rain entry, and fixing straps.

Please be aware that you need to pilot drill holes through the male spigot and use 3 stainless self tapping screws (not supplied) in order to fix the liner in place. So make sure you have the screws and have drilled the holes before you are up on the chimney. I prefer using the stainless steel pot hanger cowl (the cowl above this one) if installing 125mm or 150mm liners as it is even easier to use.

Pot hanger
Product	125mm	150mm	175mm	200mm
POT HANGER AND RAIN CAP
POT HANGER AND RAIN CAP	£99.00	£102.00	£105.50	£109.00

Leca insulation backfill for flexible flue liners UK - Leca is used to insulate around a flexible chimney liner where there is not enough room to fit rockwool insulation and where you do not want to use chimwrap. Leca insulation is similar to vermiculite insulation in that the chimney is blocked from the bottom using a register plate and the insulation is then poured around the flexible chimney liner from the top of the chimney. Unlike vermiculite, leca will not compress if it gets damp/wet. I much prefer using the chimwrap if possible as it is far easier to use and carry.

£17 inc VAT

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At last a chimney liner insulation method that solves many of the problems that one can have with rockwool or leca. Where we had to use the old fashioned leca backfilling method we can now use Chimwrap. Chimwrap insulation is very thin and flexible and so can go round bends in the chimney relatively easily. Of course there will still be occasions where using leca is necessary or where it is still easy to use rockwool sleeves but commonly it will be easier to use Chimwrap.

For more details please see our using chimwrap guide.

Insulating flexible flue liners in wide chimneys has always been a problem because of the large amount of leca needed to backfill the chimney. Now we carry rockwool sleeves, by Rocklap, that just clip around the liner as it goes down the chimney. The rockwool sleeves are strong lengths of pre-formed insulation with a one piece, factory applied foil facing with an integral self-adhesive lap.

Sections are 1200mm long with a 30mm wall thickness.

ROCKWOOL FLUE LINER INSULATION
Product	125mm	150mm
30MM ROCKWOOL SLEEVES - 1000MM 125MM DIAMETER	£31.25	£31.25
FOIL TAPE	£18.50