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Flue pipe clearances and heat shielding

doc j

Flue distance to combustibles - in Document J, pages 32 and 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

Single skin flue pipe - distance to combustibles

Single skin, un-insulated flue pipe must be at least three times it's diameter (OD) from combustible materials. Combustible materials must therefore not be within the grey shaded area shown in the diagram below.

single skin flue pipe clearances to cobustible materials

For example a 125mm single skin flue pipe must be at least 3 x 125mm = 375mm from combustible materials (being pedantic the actual figure is a little higher as 125mm refers to the internal diameter not oustide diameter).

Heat shielding combustible materials

The combustible material can be heat shielded. The flue must be at least 1.5 times it's external diameter away from the heat shield, the heat shield must extend at least 1.5 times the flue's external diameter to each side of the flue, and there then has to be an air gap of at least 12mm between the shielding material and the combustible material.
Practically this can be acheived using 12mm fireboard. Strips of cut fireboard are used as spacers behind to achieve the 12mm air gap.

flue pipe distance combustibles heat shielding

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