Chimney Cheltenham

Some of the Different Types of Chimney Liner Available

If you want to use your chimney with an open fire, gas fire or a wood burning stove you may have been told that you need to have your chimney lined. If you are building a new property with a chimney it must be lined to comply with Document J of current Building Regulations. Likewise, for older properties, there are many safety benefits to be gained from having a chimney lined.

The most important thing to remember is that the smoke from your open fire or multi-fuel stove or wood burner must exit via the flue as quickly and smoothly as possible. Where a chimney is constructed of brick, the bricks and mortar can degrade and crumble over time. 

If you spot any sign of degradation of the internal brickwork means that the chimney will have to be lined. This is because the flue may leak smoke into another room in the property and also, smoke will travel most efficiently through a smooth flue.  Any lumps and bumps caused by the uneven bricks on the way up through the flue will slow down the flow of the smoke; the smoke will cool and leave deposits on the side of the flue.  A build up will quickly occur and increase the risk of a chimney fire in your property..  

The internal condition of your chimney may look fine at the moment but installing and using a fire or stove regularly will have the effects of the degradation of the brickwork on the inside of the chimney sped up. This is due to the heating and cooling of the bricks whilst the fire or stove is being used.  

My chimney needs lining, what are my options?

There are many different types of liner on the market made with lots of alternative materials.  The main differences between the liners can be simplified into three variables – durability, longevity and price. Here at Turner Baker, we have a number of options available: 

Furanflex

A relative newcomer to the market is the Furanflex thermosetting resin lining system.  In layman’s terms, this refers to a liner that is supplied as a soft malleable material which can be placed into a chimney Cheltenham and is then steamed or ‘cured’ into a hardened structure that is resistant to high temperatures.

The Furanflex liner was introduced to the UK in 2010 following a rigorous testing programme to ensure that the product met UK standards. The product has been certified by BBA (British Board of Agreement see the website here).

Furanflex comes in two different formats – the Furanflex Black has been tested to 400 degrees Celsius and is suitable for all Decorative Fuel Effect type gas fires, gas and oil heating boilers – especially high efficiency and condensing applications, ductwork, pipes and re-sleeving applications.

Furanflex RWV has been tested to 1000 degrees Celsius and is suitable for solid fuel appliances and solid fuel open fires.

 

If you would like to see a video showing a Furanflex installation, please click through the Furanflex page on the Turner Baker website here.

The team at Turner Baker have all been fully trained to carry out Furanflex installations. We have been successfully installed them in residential properties, schools and businesses for the past five years.  

Stainless Steel Chimney Liners

The entry point into chimney Cheltenham and flue linings is stainless steel.  There are lots of different grades and ratings of stainless steel and it is worth taking the advice of an expert to get the right product for your property’s chimney.

Stainless steel can be available in either a flexible format (to accommodate the bends in the chimney or flue), or as a rigid piece. Flexible stainless steel liners are supplied as one long piece whereas rigid stainless steel is supplied in sections which are slotted together.

• Flexible Stainless Steel Flue Liners
  • Multi-Fuel flue liners (Class 1) are available in two basic grades of stainless steel. The standard product is Grade 316 which comes with a 10 year product guarantee, and the higher quality grade 904L comes with a 20 year product guarantee.
  • The corrugated outer wall provides crush protection during installation. The inner wall is smooth so that it can encourage the flow of flue gasses and to discourage the build-up of soot and other potentially corrosive residues.
  • Gas and oil flexible flue liners (Class 2) however are manufactured out of a single strip 316 grade stainless steel and are designed for atmospheric gas and kerosene appliances where the flue gas temperature does not exceed 260°C. These liners are not suitable for use with solid fuel.
  • Flexible flue liners are available in a comprehensive range of diameters suiting all applications, from 100mm to 350mm.
  • We offer flexible stainless steel flue liners for either multi-fuel stoves or for gas and oil appliances.

• Twin Wall Rigid Stainless Steel Flue Systems
  • Twin Wall Flue Systems are modular insulated flue and chimney Cheltenham systems that can be used either internally or externally. Turner Baker Ltd can supply systems for a range of applications:
    • High and low-temperature applications
    • Positive and negative pressure
    • Condensing appliances.
    • Solid Fuel, including Biomass
    • Gas and Oil Appliances
  • The liner units are constructed using a stainless steel inner liner, with at least 25mm of insulation, surrounded by a structural outer skin. Units are retained in place using locking bands and braced to adjoining structures with wall bands. The flue can then be constructed either externally or internally through the property or building or can be free standing.
  • Turner Baker Ltd are able either to supply and install stainless steel flue products or, in consultation with the client, put together a full flue kit for self-installation.

The Positives and Negatives of Your Chimney Liner Options

Furanflex Chimney Liner

Positives

• It is installed as a flexible tube.  For properties with chimneys that have bends in them – and this is certainly the case for a lot of older properties – this is a great benefit.
• The liner can be installed freestanding and it can mould to take the existing shape of the chimney which maximises the cross-sectional area of the flue. Various other lining systems are a set shape and may reduce the size of the flue which in turn affects performance.
• The Furanflex liner doesn’t adhere itself to the chimney and can, therefore, be easily removed if necessary.  This makes it an ideal option for heritage properties with listing restrictions which won’t allow for permanent changes to the structure.
• The Furanflex lining system is guaranteed for 25 years.  In the event of a chimney fire, systems such as stainless steel will need to be replaced before a flue can be used again.  The Furanflex system is able to withstand very high temperatures – and in theory should be able to withstand a chimney fire.  However, any flue that has suffered from a chimney fire should always be inspected along its length prior to being reused.
• This system is available in a range of different diameters and lengths which makes it flexible to install – a solution can be found for most types of chimney.

Negatives

• Slightly more expensive than other options available. However, it is worth it due to its’ 25 year guarantee which gives the product a much longer lifespan than some other chimney lining systems, particularly stainless steel liners.
• It can only be installed by chimney Cheltenham professionals who have been trained to use the system and have the specialist equipment required to install it.  If you are looking for a low-cost solution that you can install yourself then the Furanflex system is not for you.

Stainless Steel Chimney Liner

Positives

• Relatively inexpensive
• Can be installed as  a freestanding unit either on the inside or outside of a property
• Can be used to refurbish existing flues

Negatives

• Short lifespan – many stainless steel liners are only guaranteed for 10 years
• Will not withstand any chimney fire
• Can corrode rapidly with the use of certain fuels
• Easy to damage on installation

Turner Baker: Chimney Experts

There are many different types of chimney Cheltenham and flue lining available to suit both residential and commercial purposes. If you would like to discuss your requirements further please call Turner Baker Ltd on 01432 839123 to talk to a specialist who will be able to advise on which products will work for your situation.  We can put together a kit list of items required, and construct a quote for those items that you need.

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