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 316 grade FlexLine flue liner comes with a 10 year warranty, the 904 grade with a 20 year warranty.
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 316 grade carries a 10 year warranty and the 904 grade carries a 20 year warranty.
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.
All prices are Per Meter
|FlexLine Flexible flue liner||Product||125mm||150mm||175mm||200mm|
|FLEXLINE STAINLESS STEEL FLUE LINER|
|904 GRADE LINER||£47.75||£58.25||£62.50||£69.50|
|316 GRADE LINER||£26.75||£30.75||£37.75||£42.25|
|FLEXLINE LINER ADAPTORS|
|FLEX PIPE ADAPTOR||£37.50||£37.50||£46.75||£50.75|
|FLUE LINER FIXINGS AND COMPONENTS|
|BOTTOM SUPPORT BRACKET||£21.25||£21.25||£21.25||£21.25|
|INSULATION FOR CHIMNEY LINER|
|LECA BACKFILL INSULATION 50L BAG||£18.50|
|30MM ROCKWOOL SLEEVES - 1000MM LENGTH||£35.00||£35.00||£49.00||£49.00|
|50MM ROCKWOOL SLEEVES - 1000MM LENGTH||£66.75||£66.75||£66.75||£66.75|
|FOIL TAPE FOR ROCKWOOL SLEEVES||£18.50|
|RAIN CAPS AND COWLS|
|TERRACOTTA COLOUR S/S POT HANGER COWL WITH BIRDGUARD||£87.75||£99.50|
|STAINLESS RAIN CAP FOR FLEX||£42.75||£43.25||£49.50||£55.50|
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). To fix the liner to the pot hanger you simply drill three pilot holes and use three stainless self tappers. 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.
A stove is far more efficient than a fireplace and because a stove uses less air there will be fewer draughts created in your house
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 when using a pothanger if you use flexwrap; and in a few situations it may be 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 has two parts really, or rather you need to order a rain cap to stop rain entry as well as the hanger. The hanger takes the weight of the liner and has a lip to centre it to the chimney pot. Obviously it will not work on fancy chimney pots, just standard rolltops or straight beaded pots.
Please be aware that you need to pilot drill holes through the male spigot and use 3 stainless self tapping screws 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 and is an all-in-one component.
To check if your firewood is seasoned, look for splits across the grain on the cut end of the log
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.
|QUANTITY||50 litre bag|
At last a chimney liner insulation method that solves many of the problems that one can have with rockwool or leca. Flexwrap chimney liner insulation is a thin, flexible material that your wrap and then tie around the liner. Flexwrap can go round fairly sharp bends in the chimney which would not be possible with rockwool sleeves. Of course there will still be occasions where using leca is the best choice or where it is still easy to use rockwool sleeves, as they are a little cheaper. Another advantage of Flexwrap over rockwool sleeves is that you can fix the Flexwrap to the whole length of the liner before pulling the liner up or pushing it down the chimney. This is not very easy with rockwool sleeves as they are fairly inflexible and quite heavy.
For more details please see our using flexwrap guide.
Burning unseasoned wood will give you a reduced heat output, a tarred up chimney, blackened glass and a lousy fire. Always burn seasoned wood
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 1000mm long with a choice of 30mm or 50mm wall thickness.
What size of stove do you need for your room? Our kilowatt calculator will help