Stove with Liner required
Stove in an Existing Fireplace Liner required
This is the most common scenario which is encountered which is why a there’s a liner required on this project. Most properties built before the mid-sixties had unlined chimneys – i.e. the inside face of the chimney is plain bricks and mortar. Nowadays, most chimney sweeps will refuse to work on a flue of this type. Because modern stoves are so efficient, the smoke and gases emitted by them are comparatively cool and therefore, do not need to cool much before depositing condensation and tar. The relatively large cross sectional area of an unlined chimney, its rough surface and the presence of voids exacerbates this process. If the gases slow down too much, it then has a damming effect causing the stove to perform poorly. The tar can bleed through the mortar courses; in one property I was shown an upstairs wardrobe which stank of tar.
Here is a picture of some extreme damage
A liner is introduced into a chimney from the top. This means that access has to be provided, often by erecting scaffolding. The liner will do its job much better if it is insulated. This is achieved by filling the space between the liner and the brickwork with insulation. In order to do this the chimney pot has to be removed and the fireplace at the bottom has to be sealed with a steel register plate. The liner supplied by A&B is made from the higher grade 904 stainless steel.
This chimney needs to be lined
Chimney pot removed and liner going down in a Victorian property
Top plate and clamp in place
Chimney Pot reinstated and Anti Bird Guard installed
Showing register plate in fireplace at bottom of chimney
The liner can be seen in the centre
Showing detail of attachment of stove pipe to liner
Showing Vermiculite Insulation around liner
Custom made adaptor for an Inset Stove
Inset stove installation completed
Redundant flue capped off with paving slab – note ventilation
This picture shows what is known as a Pothanger Cowl
The liner is clamped to the cowl with a large jubilee clip – it can’t be seen in the photo because it’s inside the chimney pot. This type of cowl could be used in a situation where for, whatever reason, it is undesirable to remove the existing pot; furthermore, it negates the need to use a top plate and clamp as seen in the other photos. This particular case posed a (so far), unique situation; when access was gained to the top of the stack, it was discovered that the chimney had a partial clay liner – there was no evidence of it at the bottom. At the top there was an insufficient gap to be able to pour vermiculite between the stainless steel liner and the clay liner. Note the slight gap between the pot and the cowl to ventilate the void between the two liners.