Do I Need To Line My Chimney?
Before you install a new stove, you must have your chimney swept and smoke tested by either a registered chimney sweep or the HETAS engineer installing the stove. Either of these qualified people will be able to inspect the condition of the chimney and the results of the smoke test will reveal whether or not your chimney is leaking. If it is leaking, then you MUST have your chimney lined to comply with current building regulations.
The chimney liner performs a number of important functions and provides the conditions needed for the flue system to function effectively, such as:
1) Should the mortar in your chimney crumble in the future, a liner will contain all the exhaust gases produced by burning solid fuels and prevent them entering your living space, before expelling them safely away from your home.
2) A liner will keep the flue diameter constant all the way up the chimney, which helps to keep the gases hot enough to rise up and out of your flue, reducing the likelihood of condensate and in turn improving the draw of your chimney.
3) If burning a wood, a lot of tar can be deposited inside your chimney unless the wood is very well seasoned. A liner will prevent this from penetrating through the brickwork into your rooms.
4) Sweeping will be a lot easier if the flue is the same size all the way up, resulting in less soot build up.
If your chimney does not leak then it is possible to connect to your existing chimney using a register plate or spigot plate, however, we would always suggest you install a liner where possible.