Non chimney installs


Stoves Etc Twin Wall Flue Installations

We here at Stoves Etc have a range of products that give you the ability to create your own chimney system. If you do not have an existing chimney in your home and you want to install a wood burner stove, you will need to use Twin Wall Insulated Flue Pipe. We have a complete range of Twin Wall Flue pipe from Convessa and Dinak DW; both are high quality brands of twin wall pipe and brands that we at Stoves Etc trust and have had strong positive feedback from customers and fitters.

Because twin wall flue pipe installations are so varied for requirements such as length, angling and materials the pipe is going through, we cannot supply all in one kits as we can with the flexible flue liner. You need to calculate the dimensions and required parts once you decide where you want the flue to run through the house. You must either go through a wall then out up an external wall to above your roof or you can go up internally, through the floors of your house and through the attic and roof.

If you do not feel confident in doing this yourself then you can get a local builder or a HETAS installer to do it for you. Either way you should make yourself familiar with the building regulations relating to wood burning stoves (more information can be found click here).

If you would like us to plan your installation for you, we can certainly help with this. We will be able to provide a guide as to what parts you require and a quote. Feel free to telephone us.

Starting your insulated flue system

The flue system should start with a length of single wall vitreous enamelled pipe as it is harder wearing and will handle the high temperatures expelled from the wood burning stove better. You can for aesthetic purposes, use the adaptor to twin wall directly into your stoves flue collar.

If you start your system with single wall pipe you can use it internally but you cannot pass through walls, ceilings or roofs with it; it can also only be used internally. You must convert to twin wall pipe at least 4 inches (100mm) before going through a roof, ceiling or wall.

Converting from Single Wall Pipe to Twin Wall Pipe

Before you can pass through a wall, ceiling or roof, a conversion will have to be made to twin wall pipe using an adapter, (available on stoves etc click here; ensure the adapter is the right diameter for your install). This single to twin wall adapter slides into the top of your single walled pipe and allows twin walled pipe to be attached, thereby creating a twin wall system from then on. This plus all other joins between pipes in a twin wall system require a locking band to attach and seal the parts, these are included free with our Convessa range of pipe, but must be purchased separately in the Dinak DW range.

Creating your flue pipe system

Once you have converted to twin wall flue pipe you have to plan your route and measure out what components, pipe lengths and bends you will need to get to the wall or ceiling (depending where you want to take the system).

Passing through a wall

If you go through a wall, you will need a wall sleeve to protect it and a finishing plate to cover the hole so it does not look aesthetically un-pleasing, it must be larger than the outer diameter of the twin wall pipe to avoid it touching the wall. This will allow the two components of your twin wall pipe to safely pass through a wall. Once the pipe is outside you can then attach an elbow (45 degree) and continue up the external wall.

Passing your twin wall pipe through the ceiling

If you continue your system internally, you can pass through a ceiling using a ventilated firestop plate. Note that the plain fire stop plates are for gas installations only when going through a ceiling. You need to use one either side of your floor (i.e. one on the ceiling and one on the floor above).

Passing your twin wall pipe through a roof

When passing through a roof you need to make sure that the roof does not touch the twin wall pipe. Use a plain firestop plate on the underside of the roof so that the hole is covered; install flashing (available here from Stoves Etc) on the top of the roof to make a seal. You will need to install the high temperature flashing if your twin wall passes through the roof and is less than 5 meters away from your wood burning stove, if that is not the case, the low temperature flashing will be sufficient. If you have a roof that is corrugated or uneven you will need the EPDM master flash which moulds to the shape of your roof. Fixing kits are available for the flashing which gives you everything you need to create a seal for the pipe. You will need a storm collar to cover the top of the flashing around the twin wall flue pipe to make the seal weather proof.

Twin wall flue pipe chimney cowls

It is required that your twin wall flue pipe is at least 600mm (23.6 inches) higher than the pitch of your roof, otherwise, the top of your twin wall flue pipe should be at a minimum 2.3m horizontally away from the sloping aspect of the roof. On top of your pipe you will want to finish off with a chimney cowl or rain cap - click here.

We hope this little guide helps you in the installation of your twin wall flue pipe. If you have any further questions feel free to get in touch with Stoves Etc using our contact us page.