Whatever form of heating you use, an efficient chimney flue is essential for both health and to save money. Poor insulation causes condensation, which mixed with the chimney fumes causes sulphuric acid that eventually destroys the brickwork and mortar, resulting in dangerous joint leakage. It can lead to the chimney stack collapsing.We offer an insitu liner repair with the following benefits Quick Clean Installation. Minimal Disturbance. Increased Appliance Efficiency. Reinforced Chimney. Gas Tight Flue. Cleaner Living Environment. Easy to Maintain. Suitable for all Fuels. Domestic and Industrial Use.