ABOVE: Lining a chimney using a multi fuel flexible liner for wood burning stoves.
Reasons for lining a chimney when installing wood burning stoves
For a wood burning stove to work correctly it must be connected to a sound chimney and correctly sized flue, therefore it is always recommended fitting a chimney liner when installing a new multi-fuel stove.
If a chimney liner is not installed there are a number of problems that you may experience.
1. Smoke and fumes from wood burning stoves leaking into other rooms or parts of the building.
2. Tar seeping through the chimney walls causing staining.
3. The old flue surface has deteriorated, resulting in poor up-draught.
4. The flue is much too large for the type of appliance being used resulting in poor up-draught.
5. The flue is cold and damp especially if it’s on the outside wall, reducing the heat of the smoke and gases resulting in poor up-draught.
Can I do the work myself?
Although lining a chimney for wood burning stoves now falls under building control it’s not a complicated job and can be done by a competent DIYer, however you must inform your local building control department who will inspect the work once the job has been completed. Please click here for Building Regulations that apply to stoves. Document J
If you would like your chimney liner to be installed for you, please see our HETAS installer page.
Tools required to install a flexible chimney liner
There are no specialist tools needed to fit a flexible chimney liner for wood burning stoves, however you will need access to the top of the chimney stack using roof ladders or preferably scaffolding, it is highly recommended to use harnesses when working at height, other safety equipment should include masks, goggles and gloves.
Installing the flexible flue line
1. Before you start the chimney must be swept and inspected for structural defects and the area around the stove should be protected from debris and dust.
2. If you are using our chimney pot hanging cowl, you can skip this step, otherwise you will need to remove the chimney pot and mortar on top of the chimney stack.
3. Cut the register plate to size and fix the angle iron in place.
4. You will need a piece of rope 5 meters longer than the liner. Tie a weight to it and lower it down the chimney.
5. Attach the nose cone to the bottom of the liner (the liner is directional, arrows pointing upwards) and if using Rockwool, Chimwrap or k-wrap secure this to the liner.
6. Tie the rope to the nose cone and lower the liner down the chimney, if there are bends in the chimney and the liner gets stuck it is possible to open up the chimney from inside the house to help the liner navigate the bend.
7. Once the chimney liner is in place, connect the chimney liner to the appropriate adaptor using stainless steel self-tapping screws then fit the stove pipe, now fit the register plate, put the stove in place and seal around the register plate and flue pipe with fire cement.
8. If you have pre insulated the flexible flue liner it is recommended that you put adequate vermiculite insulation above the register plate to stop the heat escaping in to the chimney void, this should be done before putting the top plate on.
9. If you haven’t pre insulated the flexible flue liner then it is recommended you fill the chimney void with vermiculite insulation.
10. If you are using a chimney pot hanging cowl cut the flexible flue liner to length and attach the chimney pot hanging cowl to the chimney liner using the provided fixing straps, insert the cowl into the chimney pot and attach using the straps provided.
11. If you are using the traditional method cut the liner to length and fit the top plate and insert and then the top clamp.
12. Re-fit the chimney pot and leave for 34 hours before performing a smoke test.
Wood burning stoves should always be treated with care, regularly maintained and well installed. A poorly installed or poorly cared for wood burning stove can cost lives. These instructions are designed as a guide only to help safe installation but if you are unsure on how to install your wood burning stove then please do contact a professional.