We are able to offer this, the most traditional method of lining, using refractory concrete, clay or ceramic liners of the same type commonly used in new buildings. There are also some pumice liners designed specifically for relining.
INSTALLATION. The chimney has to be opened at frequent intervals to insert the liners, essential if there are bends in the flue. The resulting dust, mess and subsequent redecorating are not popular with householders, making this system more appropriate for vacant property.
If the old flue is large enough and straight it may be possible to lower liners down from the top without opening the flue inside the house.The liners must either have rebated and socketed joints or steel locking bands. (NB – rebated and socketed joints must be fitted the correct way up. Rebates are there to prevent anycondensates running down the fluefrom leaking out, therefore the socket end must be uppermost and the spigot end fitting down inside the lower pipe).
Another issue with this method is the wall thickness of the liner, usually 20-25 mm. Twice this dimension plus a clearance needs to be deducted from the size of the original flue, resulting in a much reduced flue cross section. This reduced size will often be too small for an open fire so a closed appliance may have to be fitted. Clay liners used in this method must comply with BS EN1457 : 1999. Refractory concrete liners with a much higher insulation value and ability to withstand thermal shocks such as in a chimney fire are recommended, particularly for wood burning stoves. Liners made with pumice and high alumina cement are best and comply with Building Regulations. Alternatively the product should havea British Board of AgrémentCertificate.