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In old chimneys the mortar joints between the bricks or stonework fail. The mortar becomes porous, turns sandy and crumbles away. Then poisonous fumes, tars and condensation can all leak out of the flue into the home. ISOKOAT is applied under pressure and forced into the cracks and fissures, sealing them, re-pointing the joints and making good the flue wall. Mineral fibre reinforcement in the ISOKOAT ensures that the wet material will not pour or leak away through larger cracks, but will be forced into and fill and bridge them. The coating is built up usually using between 2 and 4 applications to provide a smooth, gas tight flue which will withstand the effects of flue gases for years to come. The flue is fully repaired and sealed with virtually no reduction in size; very important if the correct flue size is to be maintained for the Open Fire or appliance served by the chimney.

This ISOKOAT flue coating and renovating system developed by ISOKERN, has been used in thousands of installations in Europe since the 1950's. The system has demonstrated its simplicity and reliability and given many an old or leaking chimney a complete new lease of life.


The Isokoat repair process

A hand cranked winch assembly, A, is temporarily secured to a special steel bristled brush, C, which has been made to dimensions larger than the chimney flue shape, whether square or rectangular.

The steel bristled brush supports first a heavy duty sponge section, D, and then a hessian, or similar membrane, E. As the assembly is drawn up the flue, measured quantities of the unique ISOKOAT filling material, F, are systematically poured into the top of the flue and rests on the membrane, E.

The weight of the ISOKOAT filler, combined with the pressure exerted onto the wall of the flue by the upward moving brush and former assembly, forces the ISOKOAT into cracks, gaps or fissures in the flue wall. The procedure is repeated until we are satisfied that the chimney is fully repaired.

This process ensures the chimney flue system is not reduced allowing the maximum size for the removal of harmful gasses from the appliance in the fireplace.