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Chimneys and Flues

The function of a chimney or flue is to safely remove the products of combustion from the appliance to outside without causing danger to the occupants of the house or setting the house itself on fire.

For improved efficiencies and to get the best performance out of your stove it must be connected to a sound and correctly sized flue, for this reason we would always recommend relining your chimney. 

There are a number of reasons why your chimney may need lining:

1. The flue is leaking smoke and fumes into other rooms or parts of the building.

2. Condensates or tar are seeping through the chimney walls causing staining, either inside or outside the building.

3. The flue is much too large.

4. The flue is too cold and is not drawing properly.

5. The existing liners have been fitted incorrectly.

6. The old flue surface is eroded and rough, causing resistance to the flow of the gasses resulting in poor up draught.

If, however you intend to bring your existing flue back into use it must be swept and smoke tested by a competent person to deem it sound.    

Types of Flue

Nowadays, there is a wide choice of factory made chimney and flue products available. To find out which one is best suited for you please visit our showroom to discuss your requirements with our knowledgeable staff or arrange for one of our engineers to carry out a free home survey.  

Twin Wall Flexible Flue Liners

Flexible flue liners can only be installed completely enclosed inside a masonry chimney. Combustible enclosures such as timber or plasterboard are not acceptable.

They are manufactured from corrosion resistant stainless steel and are a twin skin construction intended for gas, oil, and multi-fuel where flue gas temperatures do not exceed 600 degrees C.

There are generally two grades of stainless steel liners available. 316/316 grade are more commonly used but we would recommend installing a 904/904 grade liner if you intend to slumber the appliance and / or use coal based solid fuels.  

To offer peace of mind the liners we install are amongst the best quality on the market and are issued with a guarantee period to match that of the new appliance (or 20 years for 316/316 grade liners and 35 years for 904/904 grade liners, whichever is greater). The same can’t be said with many of the cheaper alternatives.

Insulating Flue Liners

For a flue to work effectively, it must be kept warm to increase the upward speed of flue gases and to help prevent condensation forming around the liner.

We would always advise where feasible to insulate your new liner particularly if the chimney is in an exposed location, the stack is particularly tall and / or if the existing flue has a large surface area.   

There are many methods commonly used to insulate flexible flues including vermiculite, leca beans or rigid Rockwool sections. Our preferred choice is Chimwrap, a unique and patented product manufactured in the UK designed with ease of installation in mind. It is available in 1, 2 or 3 metre sections with a thickness of just 12mm making it ideal for installing into even the tightest of situations.

Rigid Twin Wall Flue Systems

Rigid flue components are fabricated with a stainless steel inner liner and outer casing with a high thermal performance mineral fibre between the two walls enabling them to be positioned as little as 50mm from combustible materials. 

The systems are designed for internal or external use and are generally used when there is not an existing chimney present. They are ideal for both new build and renovation projects as they offer a quick, low cost way of installing a new stove just about anywhere in your home.

Pumice Flue Systems

Pumice is a natural volcanic material sourced from Iceland offering excellent insulating properties and high resistance to expansion and contraction with temperature change. Although extremely robust in construction it is also lightweight in design making each chimney system quick and easy to install.   

Pumice flue systems are extremely versatile and can be used internally or externally for both the construction of new and the refurbishment of existing chimneys.