Installation - Flexible Steel Lining

Installation - Flexible Steel Lining

To encourage flue gases to rise, we install a flexible steel sleeve through the existing chimney system, connecting it directly to the rigid pipe coming off the stove. Once this has all been fitted, we backfill with vermiculite insulation. When a stove is initially lit, the air vents are open to establish a hot blazing fire. Once this has been achieved, the stove user will turn the appliance down to enjoy the radiant heat from a controlled burn. Meanwhile the steel lining system has been brought up to optimum working temperature and the insulation around it helps to maintain the flue temperature during the long slumber burns, which are characteristic with stove use.

There are a great many manufacturers of flexible lining systems, of which we have used several. There are differing grades of steel and different locking mechanisms to help keep the product together as it is bound as two separate strips of steel. Inferior twin lock flue can lead to springiness in the product, which tends to concertina when it is inserted through an existing flue. This can prove very awkward when trying to install, especially if bends and offsets are present within the flue. Often twisting can help to install a flexible lining, but weaker locking systems all too often separate under stress and need to be scrapped, as it is not permitted to join two lengths of flexible lining within a chimney.

Cheaper flue often means weaker material, and ultimately false economy. We are regularly called to remove failed flue systems after only a handful of years. Faulty installation practices, inferior grades of steel or the use of incorrect fuel being the main causes. As stockists in Northern Ireland, 904 grade Docherty Chimney Group flue is primarily the flue we use at County Down Stoves and Flues. It carries a 20-year warranty, and is suitable for use with wood, turf and coal appliances including smokeless coal. If only wood and turf are going to be used, we will use Docherty’s 316 if asked and it carries a 10-year warranty. Docherty flue is more robust, with increased rigidity, which makes it a pleasure to work with, making it the product of choice used by many of the registered chimney technicians throughout the UK and Ireland. If we are being honest, you are the one paying for the product, and we are normally the ones working with it, so we are all winning.

Click here for a full brochure explaining the flexible liner.

Latest News

Site Search

Official Clearview Stockists

About CDSF

Co. Down Stoves and Flues are N. Ireland's official stockists of Clearview Stoves with over twenty five years of experience in the solid fuel industry. As the only stockists in the province approved by Clearview to sell and install their products, you can rest assured you are in safe hands when it comes to your purchase, installation and maintenance of such a prestigious product.


Naghan Lodge
200 Newcastle Road
Seaforde, Co. Down
BT30 8NU


We have over 30 years of experience in the business. David is Chairman and PR Manager of the Northern Ireland Association of Chimney Sweeps, trains chimney technicians North and South of the border, has worked closely with the Health and Safety Executive in the successful launch of it's Carbon Monoxide awareness campaign and has given seminars for NI Building Control, NHBC and a number of architects throughout the province.
Our registered chimney technicians will install our solid fuel appliances to ensure it meets building and fire regulations at all times.
linkedin facebook pinterest youtube rss twitter instagram facebook-blank rss-blank linkedin-blank pinterest youtube twitter instagram