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HETAS approved external insulated twin wall flue systems

Insulated twin wall flue systems installations by The Cast Iron Fireplace Company.co.uk Ltd. We are one of very few companys in London to install every type of chimney flue lining including insulated twin wall flue systems. We prefer to use the best flue metal chimney system called Poujoulat, as it is the best chimney manufacturer and because we use it regularly we can pass on the savings to our customers.
 
We design and install HETAS approved external insulated twin wall flue systems. We give estimates over the phone and follow up by completing a site survey and giving a writen quotation.
 
These flue systems allow our customers to have a wood burning or multifuel stove in your home where a traditional masonry chimney breast is not present.  This means you can have a stove in an extension, wooden building, boat, office or anywhere that needs extra heat in the coldest times of the year.  Our wood burning stove fitters can install the woodburning, solid fuel flue chimneys to the side of a property externally or internally.  Our stove installation engineers sign off their own work under our company name as they have been trained by our company and work only for us all year round, we train all our fitters for 2 years before sending them off to HETAS for their training and testing.  So far we have had each chimney engineer pass with a 100% pass rate, something we are very proud of.

On the free site survey we would have already pre quoted for the job by asking for a couple of images, one of where the stove will go and one where you think the flue system exists on the property.  From looking at the images we can accurately calculate the height of the flue required and give an estimate for the works.  Our HETAS registered chimney installation engineers can advise on the correct stove for the size of room and suggest a few routes that’s might be possible.  You may want us to supply the stove that best suits your needs or you may have a stove that is pre-bought that needs fitting.  We will be happy to install a stove that we have not supplied.  On the site survey the measurements will be taken, so that if you change your mind and want to change the stove choice we can make sure it will still be right for the room and recalculate the flue system.

Building regulations for Insulated Twin Wall systems

Our chimney lining experts install insulated twin wall systems within 50mm of combustible materials like wooden joists and rafters as the products are the best quality.  In line with regulations we are allowed to have a maximum of four 45 degree bends in the chimney lining flue system.  Flue systems have to be a minimum of 4.5 meters.  If the flue system is within 2.3 meters from a building, you are allowed to finish the system 1000mm above the nearest window, or 600mm above the ridge.  If you are terminating the flue through a pitched roof and within 600mm of the ridge, you must have the flue terminating either at least the height or 600mm of the ridge.  If you are 600mm outside of the ridge, the flue system must terminate at least 1000mm above the weathered surface or the nearest window.
Insulated twin wall systems are often used on top of existing small chimney stacks, to help increase the height of the flue.  You can also install spinning cowls or aspirators to aid the draw of the fireplace or stove in certain situations, for example if the lining system has a large external section.

By using one of these systems the flue gases are insulated from the cold elements and this helps the warm flue gases stay warm and not cool down as they rise.  If flue gases cool down too much they will not leave the chimney or lining system and the stove or fireplace that is being used will not draw properly.  A cold flue is like having a blockage as smoke comes back into the room when you light your fireplace or wood burning / multifuel stove.  If you get smoke spillage, after opening all the windows and doors to ventilate the room return to the stove and place a few fire lighters and a good amount of dry kindling.  Dry kindling will ignite quickly and produce lots of heat, which the flue needs to warm it up.  It can help to have the door of the stove slightly open by a few millimetres, as this will increase the draw of the stove.  Once the flames have been burning for a few minutes you can start loading on more solid fuel, if burning wood, start with smaller pieces of well-seasoned wood and increase the log size once each piece has set on fire.

We offer the whole package to our customers as we make honed slate, black granite or glass hearths and surrounds to order.  On top of that we sell kiln dried wood, kindling and smokeless fuel, for your stove, keeping you supplied throughout the winter.

Our log burner installation teams are polite and courteous and here to help.  As our chimney experts work for us and are HETAS registered, you do not have to apply for planning permission for the installation of your woodburning stove.  This saves you time and money when dealing with us, as building control charge around £400 to come out on site.

Give us a call to arrange a site visit on 020 8942 8881. Alternatively, email us using the book a survey page link.













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