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New masonry chimneys

doc j

New masonry chimneys - in Document J, page 22 & 33

Stove building regs pages:
Stove building regulations intro
Notice plates
CO Alarm
Installation and Building Control
Stove hearth sizes
Flue outlet heights
Flue sizes
Ventilation for stoves
Flue pipe - distance to combustibles and heat shielding
Flue pipe - recommended length
Twin wall flue - boxing in
Changing from single skin flue to twin wall at a ceiling
Lining existing chimneys
New chimneys

New masonry chimneys

New masonry chimneys should be constructed with flue liners and components suitable for the application.
You can use pumice, clay, or concrete liners.

Manufacturers guidelines must be followed and the space between the liners and surrounding masonry filled with a weak insulating concrete backfill - ie leca, vermiculite, or perlite (unless manufacturers guidelines say otherwise). We recommend using leca as vermiculite can compress if it gets damp or wet, leaving the top of your chimney uninsulated.
The joints should be kept to a minimum and manufacturers offset components used if there needs to be an offset in the system.

Our advice: for a stove we would only recommend using pumice liners. We consider that clay or concrete liners are only really suitable for an open fire, but even for this application pumice would be better because pumice is a warmer material and therefore much less likely to lead to condensation in the chimney and will also promote good chimney performance.

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