Chimney Installation

We line all of our chimney work using one of the 4 methods listed below. For further information on any of the solutions we offer and a free site survey please email us: info@fossefires.co.uk

Flexible stainless steel lining

This is quick to install and therefore a relatively cheap solution. It is the least durable method but you should expect a lifespan of more than 20 years if maintained correctly.

Isokern pumice liners

The pumice liner system comes in a range of 15 diameters from 150mm to 1000mm internal diameter. The Pumice flue liners are for masonry chimneys where the linings are surrounded by 100mm of brick, block or stone.

Pumice liners are ideal for new build as well as relining existing masonry chimneys.

Isokern Double Module System

The lightweight blocks are easy to handle. The outer and inner blocks are laid at the same time but with staggered joints for safety and stability. The double layer of pumice separated by an air gap maximises the chimney insulation.

These products are designed to last the lifetime of the house.

Twin wall steel flue

Push fit, stainless steel, twin wall insulated chimney for use on medium and high temperature solid and multifuel applications.

An internal stainless steel pipe insulated with 25mm rock wool is incased in a second pipe. 

It can be free standing in the room directly off the appliance. The flue can then continue up internally through the house or out through an external wall and up the side of the house. 

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Do I need to line my chimney? 

A stove will work best if using the flue diameter specified by the stove manufacturer or building regulations. A stove designed to employ a 150mm diameter flue won't work well at all if the exhaust gases are filling some vast cavernous brick chimney. It won't draw as well, the flue will take far longer to warm up - it won't retain it's temperature, the smoke will cool as it goes up... then stop rising... liquify... solidify... (As well as risks of chimney fire and carbon monoxide leaks). Your stove won't work very well, you'll complain. Basically we don't fit stoves without chimneys that are appropriately lined. 

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Why do I need to insulate a flue? 

Insulated liners keep the flue gases warmer, increase the upward speed of those gases and help prevent condensation forming on the liner. Cooling gases also slow down and “dam” the rising hot air underneath, this can cause puffs of smoke to exit via the air vents of your stove.

We view this as best practice and a necessary cost to ensure your stove works as well as possible. Be wary of quotes that don't list insulation/backfill in the cost. 

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Do I need a chimney already? 

No. Twin wall flue and Isokern DM systems are a perfect means of creating a flue in homes with no existing chimney. Isokern also manufacture a fire chest that can create a fireplace in your room.