PUMICE LINERS

Highlights

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.

Advantages of PUMICE LINERS

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
Good resistance to temperature variations gives the maximum performance
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
Relining masonry chimneys

Made from 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.

High functionality

Pumice has very little expansion and contraction with temperature change. This reduces the possibility of cracking and structural damage. 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. Pumice is strong yet lightweight allowing one person to lift and build the chimney units.

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Details & Services

Find out more about the details and services for the PUMICE LINERS chimney, such as the structure, detailed technical data or suitable services. You also have the option of downloading flyers or brochures about the product.

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Structure of the system

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.

Flue liner installation

The flue liners are installed socket uppermost and sealed with Isokern lip glue. Lip glue joints should be approximately 2mm thick. A special bag is provided for ease of application. Remove any excess glue to maintain a smooth surface. Clad the liners with a minimum of 100mm thick suitable masonry. A minimum thickness of 15mm leca insulation must be installed between the liners and masonry. Mix 20 parts leca to 1 part opc cement and a small amount of water.Make sure it is well mixed before using.

You must provide adequate clearance from combustible material in accordance with Building Regulations. Combustible materials must be 200mm from the inner surface of flue liner or 40mm from the outside of the masonry chimney unless it is a floorboard, skirting board, dado or picture rail, mantel-shelf or architrave. Fit appropriate lead dpc’s and flashings in accordance with the relevant regulations. Isokern recommend that the lead tray should be dressed up the outside of the flue liners to avoid a weak joint. Weep holes should be provided above the tray for moisture drainage. Terminate the chimney to the correct height in accordance with document J of the Building Regulations. The chimney can be finished by flaunching (1:3 cement/ sharp sand) either around the Isokern flue liner or a suitable chimney pot. Approved rain caps can be used to help prevent water entering the flue.

If bends are required in the chimney make sure adequate support is provided and always backfill with leca insulation mix.

Liners can be cut between bends to achieve a required offset distance.

A steel collar as well as lip glue must be used for any cut joints.

A maximum of 2 complete offsets (4 bends) are allowed per chimney and the angle must not be greater than 45˚ from the vertical.

Use and maintenance

After installation is complete tests and checks should be carried out. A chimney notice plate must be completed and permanently fixed in the dwelling, ideally near the electrical consumer unit. The checklist and notice plate are available from Schiedel.

The chimney should be left for at least 72 hours before use, then start with only small fires for the first week and gently increase thereafter. The chimney should be swept at least twice a year, once before the heating season and once after the heating season. You may need to sweep during the heating season depending upon use. The brush should be a medium density polypropylene bristle type and should be the same diameter as the flue. Steel brushes must not be used to sweep Isokern pumice flues. Always follow the appliance manufacturer’s operating instructions. Always burn approved fuels or dry seasoned wood. Avoid burning unseasoned wood and slow burning of solid fuels as this can produce excessive soot and condensation which can in turn cause soot fires and damage. If correctly installed, operated and maintained these systems should last the life of the dwelling.

Suitable services

At Schiedel, service is more than just a friendly voice on the phone. Service is an essential part of the Schiedel total package. In addition to product quality, safety, reliability and innovative strength as well as a good price-performance ratio, customer satisfaction is significantly influenced by our service. We offer the following services for the ABSOLUT energy-saving chimney:

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For professionals

Are you a building contractor, architect or chimney sweep - a true professional? Then you've come to the right place. Enclosed you will find all relevant detailed information such as all relevant downloads (PDF files) for the product or our 3D CAD/BIM database.

Downloads (.pdf, .xlsx & Co.)

Pumice Liners & Pumice DM Brochure & Installation Instructions

PDF (8.15 MB)

CAD/BIM database

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