Woodburner flue - inside or out?

[onesiedale]

We are planning to put a woodburner into our new (to us) barn conversion home.
Are we best running the flue straight up through the ceiling, through the bedroom and through the roof. Or out the back ,of the burner at 90⁰, through the 3' thick wall and up the outside, with an s-bend to miss the bedroom window upstairs?

 

[Sharpy]

Surely you will capture more of the heat, and the flue will draw better if it is inside?

 

[milkloss]

I'd do the above but think about a few things. Sound insulation between upstairs and downstairs around the flue. Obviously it'll be double skin but I'd be concerned about the bedroom getting too warm.

 

[Kidds]

Up and out just below ceiling in same room as log burner would be my choice.
Regs/spec may prevent you from going straight through the wall from log burner, usually says along the lines of 150mm max horizontal from fire and 100 of that will be the space behind the fire. Besides the regs it doesn't make for a good draw (hence the regs no doubt).
I wouldn't go through upstairs room for safety reasons, heat and fumes. Risk may only be small but enough to put me off.

 

[David.]

There is nothing wrong with taking a twinwall stainless flue through a ceiling, then through the room above and then through the loft space above before broaching the roof itself. This assumes that where the ceilings are broached, a suitable steel fire stop kit is used etc.

 

[bravheart]

Didn’t think you were allowed 90* bends, you definitely don’t want anywhere soot can lie.

 

[br jones]

Where ever you can use 45'deg ,as kidds said up and out in the same room ,save a lot of expense

 

[onesiedale]

Thanks for the input.
As the wall is 3' thick, I've had the thought that I could hollow it out and make a false fireplace . I could then take the pipe straight up from the burner to almost ceiling level then 45⁰ it outside , up and away. Setting the burner back inside the wall would then give me almost 2' of the room back.
Or even more lateral thinking;
Anyone any experience with inset woodburners?

 

[Dry Rot]

Thanks for the input.
As the wall is 3' thick, I've had the thought that I could hollow it out and make a false fireplace . I could then take the pipe straight up from the burner to almost ceiling level then 45⁰ it outside , up and away. Setting the burner back inside the wall would then give me almost 2' of the room back.
Or even more lateral thinking;
Anyone any experience with inset woodburners?

That sounds the most sensible. As you are in England, won't the stove have to be installed by a HETAS certified installer anyway? Some stove companies are very helpful. Lots on line.

 

[br jones]

Thanks for the input.
As the wall is 3' thick, I've had the thought that I could hollow it out and make a false fireplace . I could then take the pipe straight up from the burner to almost ceiling level then 45⁰ it outside , up and away. Setting the burner back inside the wall would then give me almost 2' of the room back.
Or even more lateral thinking;
Anyone any experience with inset woodburners?

A can of worms hollowing the wall,it is an old stone wall ?its an outside wall ,so damp issues from outside and above come into play, stone wall were buillt to allow damp ingress ,but thick enough to not get all the way thru.read the hetas rules

 

[bobk]

We are planning to put a woodburner into our new (to us) barn conversion home.
Are we best running the flue straight up through the ceiling, through the bedroom and through the roof. Or out the back ,of the burner at 90⁰, through the 3' thick wall and up the outside, with an s-bend to miss the bedroom window upstairs?

Inside deffo , ours goes straight up and out the roof , effectively a 13 foot radiator .

 

[teslacoils]

Whatever makes the stove / flue easier to clean.

 

[britt]

If you go outside use insulated flu. We made that mistake.
At 3o'clock on a damp foggy windless morning the smoke goes cold and it all comes back down, filling the house.

 

[deleted user 837354]

If you go outside use insulated flu. We made that mistake.
At 3o'clock on a damp foggy windless morning the smoke goes cold and it all comes back down, filling the house.

This, a million times this.

 

[br jones]

This, a million times this.

Has to be insulated by law now

 

[bobk]

Has to be insulated by law now

O

 

[bobk]

O

Only where it goes through a ceiling or roof

 

[anzani]

Only where it goes through a ceiling or roof.....

, or where flue will be within 3x diameter (of flue) of a combustible material. All joints must be inspectable and where enclosed in a void, ventilated at 1.5metre intervals. As stated, it is notifiable work under Building regs and is best done by a fully accredited HETAS installer, for safety, legal compliance and insurance reasons. "Insert stoves" require a housing which also complies.
Have seen an 10Kw insert stove built into a wooden carcass !, as if it was an electric oven. Very dodgy. Fortunately the builder involved had difficulties in getting the flue connected and invited qualified assistance before the stove was commissioned.
Often old walls 3feet thick are built with a loose rubble core, which do not readily lend themselves to creating a route for a flue.

 

[puppet]

Keeping the heat inside would be best Just make sure the contractor knows the rules about spacing and a firewall. A friend is undoing his new stove as installed too near a wall even though the instructions were
pinned to the stove.

 

[milkloss]

If you go through a chimney pot then make sure the chaps that put it in insulate the pot more than anything....