FLEXIBLE METAL LINERS
There are to distinct types of flexible liners available and it is very important to distinguish between them.
SOLID FUEL LINER
This is a double skinned liner made from and extremely high quality stainless steel, Usually 904L or 316Ti (Titanium) grade. It is smooth on the inside , corrugated on the outside and must be installed the correct way up. It is specifically designed for relining flues for solid fuel and wood. Flexible liners are relatively easy and clean to install. They are usually drawn down the chimney by rope from the top and will pass round most bends without opening up the flue.
GAS AND OIL FLUE LINERS
A light gauge single skin liner, Only suitable for closed gas fires and boilers, some inset fuel effect gas fires and kerosene oil appliances. It should never be used with solid fuel or wood burning appliances.
RIGID REFRACTORY LINER
This is the most traditional method of lining using refractory concrete, clay or ceramic liners of the same type commonly used in a new build. There are also some pumice liners designed specifically for relining. 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 the householder.