[Closed] Stove installers - twin wall installation

I'd be looking to go through the wall and up the outside. Much easier to weather seal, you won't have to polish the flue to keep it looking nice, and possibly a bit cheaper as you may not* have to go quite as high (and that twinwall pipe is expensive)

*don't quote me on this 🙂

up and through IMO.

Both our stoves go up and through. The first, once through the ceiling, acts as a radiator in the upstairs corridor. It runs in twin-wall from 450mmish below the ceiling.
[img] [/img]
The second runs through the double height driftway part of the barn, so again, it lends itself to act as a radiator for as much as possible.
[img] https://lh3.googleusercontent.com/--kyc6GB1H-U/U6FG6ov7HVI/AAAAAAAAIv0/HL2Bpc4dMkU/s640-Ic42/IMG_20140618_085817.jpg [/img][img] https://lh3.googleusercontent.com/-6mHaVknb4w0/U5gvR-Fm3QI/AAAAAAAAIpA/Mrt0RNBYE7E/s640-Ic42/%25255BUNSET%25255D.jp g" target="_blank">https://lh3.googleusercontent.com/--kyc6GB1H-U/U6FG6ov7HVI/AAAAAAAAIv0/HL2Bpc4dMkU/s640-Ic42/IMG_20140618_085817.jpg [/img][img] https://lh3.googleusercontent.com/-6mHaVknb4w0/U5gvR-Fm3QI/AAAAAAAAIpA/Mrt0RNBYE7E/s640-Ic42/%25255BUNSET%25255D.jp g"/> [/img]

'Like' for stoner's pad.

A straighter flue is a more efficient flue, get a lead flashing made to suit the pitch of your roof and it'll be weather tight.

Just thought of another advantage to going through the wall is that you have a rodding T on the outside so it is a doddle to sweep without getting any soot in the house.

If you want to use the flue as an internal radiator then best go the whole hog and install a [url= https://www.google.co.uk/search?rlz=1C2GIGM_enGB531GB531&biw=1920&bih=965&tbm=isch&sa=1&q=kachelofen&oq=kachelofen&gs_l=img.3..0l10.21970.26285.0.26573.10.8.0.2.2.0.83.589.8.8.0....0...1c.1.64.img..0.10.596.150FrgXVkYk ]kachelofen [/url]of some sort

Hmmm. I quite like the idea of going out through the wall but as the flue is going to be fairly short I think I need it to be as efficient as possible so straight up would be better.
I may be fitting a load of external insulation to the wall in question so that may be another reason to go straight up.
Got some guys coming over on Saturday to have a look at this so I'll see what they say and report back.

Don't forget to include what looks best on the outside, kerb appeal and all that

When we installed our Ebay Aga in the kitchen the chimney specialist drove the flue stright vertically upwards, though the ceiling, up the corner of the room above (which is always toasty) and through that ceiling then out of the roof with an alloy flashing. A lot of work but it works fine. He used twinwall, a bit overkill but we were concerned about the possibility of some of the structure overheating.

Globalti - the guy on saturday is mainly coming over to see if we can fit an aga flue. Can you remember how much yours cost to fit?

Somewhat off topic, hows that double height space to live with? Just working through the designs for our new place and have something similar is it awesome or a giant cold echo chamber?

My office is the open plane mezzanine on one side. The stairs climb to a bridge to the office. The other direction is the bedroom corridor.

I like the layout but it works because space is not at a premium for us. We have other rooms to be able to separate noise /TV etc. That space is big enough to make another two bedrooms and a living room if it had been necessary.

UFH at 70-90W /m2 is not enough to heat the whole area without help from the stove on cold days.

Am on train so limited connectivity. But if you want to start another thread for the topic I can put some more photos up there and talk about the glazing which matters a lot in such big volume space.

Ours goes straight up too, the lounge is 2-storeys inside.

[URL= http://i992.photobucket.com/albums/af45/bruce_nikki/PB160007.jp g" target="_blank">http://i992.photobucket.com/albums/af45/bruce_nikki/PB160007.jp g"/> [/IMG][/URL]

You get a bit of heat off the pipework too, so better inside than out.

[i]Globalti - the guy on saturday is mainly coming over to see if we can fit an aga flue. Can you remember how much yours cost to fit? [/i]

Really dependent on the walls/ceilings/roofs. Ours rises from the AGA about 4ft and then goes at 45 degrees through the wall - which is about 3-4ft worth of stone to remove...

A terrific amount of heat is given off by the flue so why waste it by having it running up outside?

A terrific amount of heat is given off by the flue so why waste it by having it running up outside?

The counter argument would be that the aim of insulated twin wall is to keep the heat IN the chimney, so as to maintain adequate chimney flow/draw.
If the chimney cools too much, you get condensation and exhaust 'stasis' (unlikely true stasis, but you get the idea).

Though it's nice to gain heat from the chimney/flue, when I read about it for my burner install (ergo, I'm the world's leading authority on the subject. Probably) I got the impression you should really only use the burner for heat, and the chimney should be insulated...

DrP

How much space around the twin wall is needed to prevent a fire risk. Timber frame and OSB/EPDM roof structure?

I was thinking 100mm should be ok?

The counter argument would be that the aim of insulated twin wall is to keep the heat IN the chimney, so as to maintain adequate chimney flow/draw.
If the chimney cools too much, you get condensation and exhaust 'stasis' (unlikely true stasis, but you get the idea).

I think that's more important in Newcomen engines than a stove, but I probably read a different book 🙂

How much space around the twin wall is needed to prevent a fire risk. Timber frame and OSB/EPDM roof structure?

Will be brand specific.
Though likely 600mm.

DrP

Nah, it's more like 50mm - if that.

Twinwall still radiates a good deal of heat. But won't get above 50-60 degs usually. There's still a lot of energy that might go wasted if emitted outside. 50mm clearance to combustible surface is normal.

[i]Though likely 600mm.[/i]

Eh? Bloody great hole needed. 🙂

Ours just goes through the middle of the 2 joists, but been in Scotland, straight through the sarking - so nearer 50mm from wood.

Or, as that muppet DrP should have put, 60mm from combustibles....

[url=file://h82087dc001/H82087-UFR/pidgeoni/Downloads/DWXpage3.pdf]Install instructions for the stuff i used[/url]

DrP

I was thinking 100 so when I saw 600 I was a bit concerned!!

60mm sounds better!

cheers guys

If you use the proper designated twin wall system you should be able to get it to 50 mm from combustible materials.
There is a designation code on the twin wall flue system, it should start with A T The minimum should be T400 then also in the code the letter G this refers to distance from combustible materials eg wood. So this should be G50
Hope this helps