Mr Whippy
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| posted on 8/6/18 at 06:15 AM |
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House stuff - wood stove flue height question
Hi,
Not remotely car related but for a wood burning stove does the flue need to be level with the ridge or above it?
Cheers 
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jps
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| posted on 8/6/18 at 06:28 AM |
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Can't remember the details but it depends how close it is to the ridge as to whether building regs says it has to be above or not. But I would
say "think of your neighbours", ours put a stove in and filled our garden with smoke on a daily basis. Although their flue height was regs
compliant there were all sorts of downdraughts thanks to prevailing winds and the roof shape..
We built an extension (and fitted a woodburner) and went for the tallest chimney we could...
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Mr Whippy
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| posted on 8/6/18 at 06:36 AM |
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almost all our neighbours have solid fuel fires as most are old style cottages, were lucky in that the prevailing winds 95% of the time are blowing
away from the row of houses out to sea so affects no one and the flue will be on the sea facing side. But a good point.
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Agriv8
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| posted on 8/6/18 at 06:47 AM |
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Whippy no idea on if it needs to be above ridge line buy the flue will need to be over a 'Certain' length I would have thought to create
enough 'Draw' for the stove to work.
Regards Agriv8
Taller than your average Guy !
Management is like a tree of monkeys. - Those at the top look down and see a tree full of smiling faces. BUT Those at the bottom look up and see a
tree full of a*seholes .............
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hughpinder
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| posted on 8/6/18 at 07:39 AM |
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Here you go:
https://www.flue-pipes.com/tips/height-on-roof
Regards
Hugh
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Sam_68
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| posted on 8/6/18 at 08:01 AM |
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quote:
Originally posted by hughpinder
Here you go:
https://www.flue-pipes.com/tips/height-on-roof
The diagram that's based on is from Approved Document J to the Building Regulations.
See pages 31 & 32, on
this link
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Mr Whippy
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| posted on 8/6/18 at 08:50 AM |
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well done, that's exactly what I needed
Thanks
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Mr Whippy
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| posted on 8/6/18 at 08:58 AM |
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seems reading through that I actually need a vastly lower flue than I first thought 
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HowardB
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| posted on 8/6/18 at 09:09 AM |
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not sure on this particular case, but are some building regs different in Scotland,... ?
Howard
Fisher Fury was 2000 Zetec - now a 1600 (it Lives again and goes zoom)
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jps
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| posted on 8/6/18 at 10:01 AM |
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quote:
Originally posted by Mr Whippy
seems reading through that I actually need a vastly lower flue than I first thought
I think this is the big point - "need - to conform with building regs" vs "need - to not have smoke flow problems in your specific
setting" is not necessarily the same thing!!!
From memory I found it hard to get info about 'tuning optimum flue length' anywhere - but we have a considerably longer flue than the
minimum regs requirement and have no problem with the amount of draw on the fire (although our flue is in a brick chimney stack so warms up and holds
the heat well - don't know how it'd work with an external metal tube flue)...
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David Jenkins
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| posted on 8/6/18 at 11:03 AM |
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As an aside - our chimney-sweep loves the external flues with a double wall and insulation between. They rarely get tarred up and are a delight to
clean (he says).
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Mr Whippy
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| posted on 8/6/18 at 11:03 AM |
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yeah, the company I'm buying it all off has been super helpful and has just supplied me all the info and parts list I needed
Turns out I need just 2.4m of flue sticking out the roof, bonus.
As for the flue type its the double walled stainless one which I have used before, it's amazing stuff and retains it's heat so well you
can hold the outside with you bare hand yet it's glowing inside, if we have issues with lack of flow I can just order another length...
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