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Last edited 18 Mar 2021
Types of chimneys
In traditional construction, a chimney is a structure consisting of a wall or walls enclosing one or more flues. Scottish Building Standards define a chimney as: ‘…a structure enclosing one or more flues, but not a flue pipe, and including any openings for the accommodation of a combustion appliance, but does not include a chimney terminal.’ A chimney terminal is another term for a chimney pot, cowl or other structure that finishes off the chimney top.
Brick. This common type of chimney found in residential construction can tolerate temperatures up to approximately 980C. However, since bricks are porous, they can deteriorate under certain climate conditions, and repointing can be necessary to prevent rainwater penetration.
Wood burning stovepipe chimneys. These vertical structures are attached to stoves and go through the ceiling and out through the roof. Due to the high temperatures of wood burning stoves, these chimneys must be able to withstand high heat. This may be referred to as a flue.
 Class 1
Traditional masonry chimneys found on older buildings (built before the 1960s) tend to be designated as Class 1. These chimneys are positioned on an internal or external wall and can contain more than one flue for more than one fire. However, fires cannot share the same flue. These chimneys tend to require liners, due to their age.
 Class 2
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