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Changing from single skin flue to twin wall flue/chimney below a ceiling

Changing from single skin to twin wall below a ceiling - in BS EN 15287-1

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

Changing from single skin to twin wall flue below a ceiling

When you change over from single skin flue pipe to twin wall insulated chimney/flue below a ceiling this should be done a minimum of 425mm below the ceiling according to BS EN 15287-1. There is also some guidance in Document J about the distance which single skin flue pipe should be away from combustibles.

Additionally the join should be in the same room as the stove - so you should not run the single skin flue pipe through the ceiling. Running a single skin flue pipe through a ceiling is a pretty bad idea because the ceiling is likely to be flammable and because it is not a good idea to have a very long run of single skin pipe anyway.

Practically speaking we recommend just using twin wall flue/chimney straight off the stove as it will look a lot cleaner and the chimney function will also be improved through being better insulated. BS EN 15287-1 also confirms that you can connect the twin wall directly to the stove without any single skin flue pipe.

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