Author Topic: Wood burning stove flue through corrigated fibre roof  (Read 4027 times)

Offline raynerd

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Wood burning stove flue through corrigated fibre roof
« on: October 19, 2015, 06:44:50 AM »
I`ve got hold of a nice wood burning stove suitable for my workshop. I`ve got the flue and it looks like it will do a good job. I just can`t figure out how to connect the flue through the corrugated fibre roof. It isn`t asbestos, just a new fibre sort of roof - standard stuff.

Any suggestions?
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Offline Swarfing

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #1 on: October 19, 2015, 08:37:27 AM »
Chris providing you have no combustible material near the opening then all you need it a corrugated roof slate to put over the flue. This should be bonded  to the roof (I've used the black sealant in a tube specific for the job). If you don't need to push the flue up too high then there is slate/ cowl that will fit direct on top of your flue.
Once in hole stop digging.

Offline raynerd

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #2 on: October 19, 2015, 11:57:57 AM »
What so literally cut a hole in the roof tile, seal and bond this to the existing roof tiles.

Is this fibre tile stuff OK for high temp and not going to set on fire - I`ve no idea what this fibre is! I`ve got a large tub of this high temp red flue and waterproof sealant. Can I just cut a hole in the tile directly, push through the flue and seal it in?
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Offline chipenter

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #3 on: October 19, 2015, 02:49:24 PM »
Iff it's the green stuf it's tar based and burnes with a lot of black smoke , you will need an intumecent coller between the flue and the roof sheets .
Jeff

Offline one_rod

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #4 on: October 19, 2015, 03:28:34 PM »
What you need is a Flue Flashing.

That fibrous roofing stuff is not heat proof, so you need to make as much clearance between the flue and the sheets as possible.

If the flue is a single skin type you need a high temperature flashing.

You can get them from building supply places or heating specialists.

Cut the centre hole to the diameter of the flue and slip it down from the top of the flue until it touches the roof. Mark out the edge of the skirt on the roof and cut the roofing back to about 50mm inside the mark. Cover the overlap area with high-temp silicone, and screw the skirt down onto it at regular intervals with sheet screws.The skirt is very flexible and will conform to the corrugations. Make sure you get it right down into the "valleys" though, and in good contact with the sealant. Particularly on the "uphill" side.

If you make sure the centre hole is a good stretch-fit over the flue you wont need to seal it there.

I would really recommend you put a weather cowl on top of the flue too. Keeps the rain from mixing with the smoke residues and rotting the flue from the inside.

According to the building regs a heating appliance flue should extend above the apex of the roof. If it doesn't you might get wind swirling the fumes back to ground level nearby. If your shop is not part of a habitable building, you can ignore the regs, but it's up to you to decide if the fumes might be a nuisance.
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Offline John Swift

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #5 on: October 19, 2015, 04:35:41 PM »

I've only used  roof plates for slate roofs

after a quick search this is the first result -
http://www.stovesonline.co.uk/wood_burning_stoves/Roof-Flashings.html

   John

Offline one_rod

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #6 on: October 19, 2015, 05:18:26 PM »
Fourth item down.
Click on the link... :thumbup:
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Offline Swarfing

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #7 on: October 19, 2015, 06:38:10 PM »
Corrugated cement fibre boards are fine as long as it is not the bituminous type. Generally you cut the hole larger than the flue, there should be at least a twin walled section that passes through the roof. this would allow a lead slate to be used which can be moulded and bonded.
Once in hole stop digging.

Offline wgw

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #8 on: October 20, 2015, 05:48:46 AM »
All the advice is good, but I would try to put the flue thru' the apex if possible, makes things a bit easier. Or thru' the wall and make  a dog-leg. You could put a larger dia' tube over the flue for a short distance to make a sort of double flue, be careful of the roof sheets, some can melt and/or burn.

Offline Arbalist

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #9 on: October 20, 2015, 06:31:33 AM »
Most of the modern flues I've seen appear to be of double skin construction as they're quite large. Do these get very hot and is it safe to say run it through a loft space or do you need additional protection to prevent a fire hazard? Just wondering if I could put a wood burner in my bungalow without too much faff. A good mate says it's too much bother but he often talks warlocks!  :D

Offline John Rudd

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #10 on: October 20, 2015, 06:46:09 AM »
Most of the modern flues I've seen appear to be of double skin construction as they're quite large. Do these get very hot and is it safe to say run it through a loft space or do you need additional protection to prevent a fire hazard? Just wondering if I could put a wood burner in my bungalow without too much faff. A good mate says it's too much bother but he often talks warlocks!  :D

Arbi.....( can I call you that?.... :)  )

In terms if installing a wood burner in your house it is fraught with the dreaded red tape.....

I draw my learned colleague to the following....,

www.stovefittersmanual.co.uk


That should give you a good insight on how to do it......

Good luck..... :dremel:  and goes without saying we need pictures...... :lol:
« Last Edit: October 20, 2015, 08:20:14 AM by John Rudd »
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lordedmond

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #11 on: October 20, 2015, 07:35:31 AM »
John

Link him not workey  :doh:

Stuart

Offline PekkaNF

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #12 on: October 20, 2015, 07:45:39 AM »
Aw...here in northern chimes EU-regulation has been good: it pretty much gives max-temperature of what stove will produce and then you choose chimney to mach. Then we get the kit from hardware store and follow mfg instructions. There are some regulations, but they are a pretty good on private dwellings. Only problem arises when there is too much insulation on ceiling and there flue temperature exceeds the spek. Or someone tries 24 hour sauna competition.

Here local Fire Inspector is pretty much allways a helpful chap and will give advice over the phone and once I asked him to visit, just to check if I can install sauna stove and in few minutes of checks he said "ok" and that's it. There were some regulation I was not even aware of, but everything turned out fine.

Pekka

Offline John Rudd

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #13 on: October 20, 2015, 08:21:34 AM »
John

Link him not workey  :doh:

Stuart

I've given it the Madmodder treatment, he worky now.... :ddb:
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Offline Joules

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #14 on: October 20, 2015, 10:50:46 AM »
Just get doing and make swarf, you can decide what its going to be later.   :thumbup:

Offline Arbalist

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Re: Wood burning stove flue through corrigated fibre roof
« Reply #15 on: October 20, 2015, 01:38:14 PM »
Thanks for the link John, very informative. And yes, of course you can call me Arbi if you like!