Log burning stove pipe regulations

19 Mar 2010
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United Kingdom
Once a 5” twin wall flue passes through the roof and into the outside, on the grounds of cost saving, is it possible to go back to a single walled flue pipe rather than continuing with twin wall all the way to the rain cap? Do current regulations allow this? Thanks
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Won't it cause condensation and sooting in that section? I thought flues ought to be kept as hot as possible.
I doubt it, and if it did I wouldn’t do it anyway. The purpose of the insulated flue is to reduce condensation. A single wall pipe would condense like mad and you’d get tar running down the inside. In old chimneys this is what used to catch fire.
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When it comes to flues its about doing whats right not whats cheapest . If you start messing about with single wall up there you could end up with water in the insulation between the two skins

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