Minster Stoves & Heating
Chimney Flue Liner Installation

Chimney Flue Liner Installation Herefordshire, Worcestershire, Shropshire

Minster Stoves & Heating offers new and replacement chimney flue liner installation in Leominster, Ludlow, Tenbury Wells, Hereford and all surrounding areas.

We are proud to be suppliers and installers of high quality British made and fully guaranteed for up to 35 years Midtherm products.

Modifications to existing chimneys, as well as the installation of flue liners and flue systems, are subject to strict local Building Regulations and regulatory restrictions, and only competent individuals should undertake such work in the interests of safety.

Why a good flue system is important

The proper amount of flue draught or ‘pull’ is critical to the successful operation of a wood-burning or multi-fuel stove. Flue draught draws air into the combustion chamber of the stove, and removes harmful products of combustion and disperses them to the outside air.

Before furniture/fittings and, of course, people (who need available air for breathing!) an average-sized sitting room contains a volume of air of 45 to 55 cubic metres. Rooms that are well insulated and draught-proofed can drastically limit the supply of usable air within the room.

To ensure there is enough air available in a room for a stove  to operate properly, it is crucial that the Building Regulations’ guidelines on air supply and ventilation be closely followed.

Because heat rises, hot and expanding flue gases from your stove will be lighter than the cooler air outside. This action causes a pressure difference between outside air and flue gases, which contributes to updraughts.

Better draught is typically provided by taller flues. As stated elsewhere on our website, maintaining flue gases at their highest temperature for the longest amount of time will promote flue updraught.

However, it is critical to get the flue height correct; taller is not always better because all flue gases cool as they rise; taller chimneys can result in faster cooling and hence reduced up-draught.

Is your chimney safe?

Chimneys constructed prior to 1965 typically feature rough interior surfaces with probable bends and voids, which can cause resistance to the natural flow of flue gases, resulting in delayed movement and cooling.

Chimneys built after 1965 are frequently lined with clay or concrete. Again, these are not suitable for stoves since the cement joints between sections cannot be guaranteed to be complete simply because they are hidden from view, and there is no guarantee that the bricklayer sealed the gaps completely or correctly.

A chimney may become damaged over time due to the intense heat produced, cooling cycles, chemical reactions from condensates, and flue gases, which may result in leaks (and potentially fatal carbon monoxide leakage). Additionally, a leak can result in a slowdown in draught or extremely cool flue gases, which can ultimately affect the performance of the stove.

Even chimneys that seem to work well with open fires can struggle to perform effectively with stoves. Stove flue gases reach far higher temperatures than those from open fires, which may compromise the chimney’s efficiency and safety.

We believe it is best to err on the side of caution and install a new flexible flue liner where a) the integrity of the flue is unknown, b) the age of an existing liner is unknown, c) the competence of the installer who installed the current liner is unknown, and d) simply for peace of mind.

Identify your chimney type by visiting our “Which Flue Type Do  I Have? page.

Chimney flue liner advantages

The addition of an HETAS approved solid fuel stainless steel flexible chimney flue liner to an existing chimney improves the safety and performance of your stove installation; thus, professional stove installers will always recommend the use of a flue liner.

One advantage of flue liners is that they provide some insulation, which helps to keep flue gases at a constant temperature; hot flue gases provide a better flue draught. This is especially obvious when the chimney is located on an outside wall (rather than in the centre of a house). Wind chill affects chimneys positioned on outside walls.

The use of a flue liner inside a chimney also aids in preventing tar and condensates from harming wall coverings and paint finishes on the chimney breast.

A flue liner must be installed for a boiler stove. Compared to wood burners or multi-fuel stoves, boiler stoves run at substantially lower temperatures.

Boiler stoves use the heat from the fire chamber of the stove to heat the water inside the boiler. As a result, the flue gases going up the chimney are much cooler.

The efficiency of the up-draught is decreased by cooler flue gases, which also rise more slowly and cool even more as they rise. Smoky chimneys, soot buildup, and creosote deposits are issues caused by cool flue gases. These issues necessitate more frequent chimney sweeping.

Reasons to fit a liner in a chimney

  • Smoke and potentially harmful pollutants enter the house through the existing chimney.
  • The existing chimney void size is not compatible with the stove manufacturer’s flue outlet specification (see Building Regulations Document J) and needs to be reduced by the installation of a flexible liner to maximise the stove’s performance.
  • The existing clay or concrete liner has poor joint seals causing condensates to run outside the liner rather than inside the liner, thus increasing the likelihood of staining.
  • Porous brickwork, faulty mortar joints, and condensates have all resulted in ugly stains on the interior and outside of the chimney breasts/walls.
  • The chimney is typically ‘cold’ because it has a huge void, is on an exterior wall or is exposed to strong prevailing winds; all of these factors will make it impossible to develop the crucial up-draught that a stove requires to burn effectively and safely and will make it take a very long time for the chimney to ‘warm’.

Given everything mentioned above, it should be clear why, in our opinion, a flue-lined chimney will always present the best choice.

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