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Pumice liners

PUMICE LINERS

A cost effective way of building a chimney in a home, therefore reducing the need for gas and electric, due to high charges, as well as being a superb focal point and a heating source during any power cuts.

Product details

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.

 

The linings are suitable for all fuels but not suitable for condensing appliances –including pellet or biomass.

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

  • Lightweight materials, easy to use ,handle and cut
  • Highly insulating pumice for better draw and minimum heat loss
  • 600mm and 1000mm lengths mean fewer joints and fast to install
  • 15 flue sizes available
  • Good resistance to temperature variations gives the maximum performance for your appliance
  • CE certified to EN1857 with the designation T450, N2, D, 3, G.
  • Three angles of bends available for maximum versatility.

All fuel types and stoves

Non-condensing appliances only

New build chimneys

Relining masonry chimneys

Stove in recess option

Our pre stressed lintels must be installed above the fireplace recess , for this method a support plate is required under the support block.

Alternatively a suitable cast-in-situ concrete slab lintel can be created above the fireplace recess. (See Isokern standard drawings for hole size depending on diameter of chosen flue).

The support block is bedded onto the slab lintel using weak mix mortar. A stainless steel adaptor is used to connect from the support block to the stove flue pipe. This adaptor is pushed up onto the support block spigot (fibre rope should be used to create a seal). It is recommended to have a minimum of 600mm length of flue pipe before connecting to the chimney.

Free standing stove option

  • A soot door must be provided below the flue pipe entry to allow for inspection and removal of soot and debris.
  • A suitable wall sleeve is to be used to seal the cavity wall.
  • Any combustible insulation within the wall must be kept away from the single skin connecting flue pipe by at least 1.5 x its diameter.
  • A stainless steel adaptor is glued to the Isokern T Liner with lip glue. The flue pipe is a push fit over the spigot on the adaptor.
  • Seal off the gap between the flue pipe and wall sleeve with fire proof rope and closing plate.

Open fire option

  • Install the firechest onto the constructional hearth using lip glue making sure all elements are level.
  • 100mm of brick or blockwork must be built around the sides and back of the firechest to comply with Building Regulations.
  • The inside of the firechest must be finished with a suitable fireback or firebrick slips.
  • Install the gather using lip glue making sure all elements are level.
  • The front face of the gather can be finished with plasterboard, rendered or clad in masonry.
  • Lintels may be required above the gather to help carry the brick or blockwork.
  • The maximum loading capacity of the Isokern firechest and gather is 2500kg.

Downloads

Isokern UK brochure

PDF (1.7 MB)

Natural volcanic pumice

Pumice is a natural insulator. This is the unique property that separates pumice from all other chimney materials. The insulating properties of Pumice allow the flue gases in the chimney to quickly reach their optimum temperature enabling the heating appliance to reach its optimum performance shortly after lighting.


It also keeps the chimney warmer longer as the heat output of the appliance decreases – once again aiding performance and reducing the likelihood of condensation and soot build-up.

RESISTANT TO TEMPERATURE CHANGE

Pumice has very little expansion and contraction with temperature change. This reduces the possibility of cracking and structural damage.

HIGH INSULATION PROPERTIES

Pumice is a natural insulator, able to maintain the temperature of flue gases when other products have allowed the temperature to fall below the dew point.

LIGHTWEIGHT

Pumice is strong yet lightweight allowing one person to lift and build the chimney units.