++ ATOT official NEF thread part IV ++

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Red Squirrel

No Lifer
May 24, 2003
68,334
12,562
126
www.anyf.ca
Finally continued on the chimney which I've been procrastinating since messing with the soffit/overhang is tedious but got it at least partially opened up. Of course with my luck there's a rafter right in the way, but I analyzed the structure and it's not structural to the roof itself. The diagonal section for the roof sits on the wall, which is further inside and the horizontal piece does not actually extend all the way inside, it's just to complete the overhang. So cutting it out is fine. Saves me some work. I didn't end up taking pics when I finished opening up the white plywood but this is how it looks under the soffit part and after initial cutting to get a peak inside.








Was getting late and the days are getting shorter now so didn't want to continue further, but I'm ready to punch the hole through the roof at this point. Covered it up for now so critters don't go in there.






With my rate of procrastinating, it's probably going to stay like that for another 3 months. But seriously, probably going to continue on Saturday. I really want to get this done, and move on to a few other projects like my firewood storage setup. I don't want to go another winter without the wood stove.


After this is done, I just need to finalize the stove pipe inside, which is easy, and then I'm ready for WETT certification and to notify my insurance. Hopefully it passes.
 

Charmonium

Diamond Member
May 15, 2015
9,950
3,157
136
This is probably a stupid question but why don't you just attach a very gently arching section of tubing. Even with perfectly vertical tubing you're still going get creosote build up that's either going to need to be brushed or baked off. And yes, any curves will probably contribute to that.

But at the opposite end of the 'burning wood spectrum,' you've got diesel/heating oil. From the furnace to the chimney there are two 90 degree turns and I've been able to get away with that for decades.

A gradual 60 degree turn shouldn't cause you any serious problems and even if it does, it's outside. How you handle the exhaust after that can be debated. I would probably first consider section of 'S' tubing with very gradual curves that extends a bit above the roof line. Secure it to a beam and then cap it off with one of those chimney top hats.

Then, if you ever have a chimney fire, at least most of the structure isn't nestled right up against your siding. Or even worse, set your attic ablaze.
 

Charmonium

Diamond Member
May 15, 2015
9,950
3,157
136
Today I discovered that there's an entire subreddit just for 'starter packs.'

I was looking for the neolithic starter pack, which apparently is a 'thing.' I came across some humorous images.
 

Red Squirrel

No Lifer
May 24, 2003
68,334
12,562
126
www.anyf.ca
This is probably a stupid question but why don't you just attach a very gently arching section of tubing. Even with perfectly vertical tubing you're still going get creosote build up that's either going to need to be brushed or baked off. And yes, any curves will probably contribute to that.

But at the opposite end of the 'burning wood spectrum,' you've got diesel/heating oil. From the furnace to the chimney there are two 90 degree turns and I've been able to get away with that for decades.

A gradual 60 degree turn shouldn't cause you any serious problems and even if it does, it's outside. How you handle the exhaust after that can be debated. I would probably first consider section of 'S' tubing with very gradual curves that extends a bit above the roof line. Secure it to a beam and then cap it off with one of those chimney top hats.

Then, if you ever have a chimney fire, at least most of the structure isn't nestled right up against your siding. Or even worse, set your attic ablaze.


Like to go around the joist? Ideally want to minimize bends especially since I already have a 180 degrees worth of turns with the stove pipe and the T connector. Normally you're suppose to go straight up through roof if at all possible but in my case it was really not practical to do since it's in the basement. My attic is also not easy to access so I avoid going in there at all costs.

Going around the overhang was also not an option at all, the pipe would need to be way too far from the house and it would end up looking really weird. The way I'm doing it is pretty much the easiest while minimizing bends. This type of pipe is not easily customizable, you buy it in sections like 3' or so, it's not made to cut like ductwork. There are some slight bend connectors you can buy but it's really not designed to wrap around stuff.

In the case of furnaces there is a motor that forces air so bends are a bit less critical but for a wood stove you rely on natural draft. Although I can't see why I couldn't add a small fan on the intake to induce a draft, then turn it off once the fire is going.
 

Charmonium

Diamond Member
May 15, 2015
9,950
3,157
136
The forced air in a furnace is to push the air around the house from the heat exchanger and suck it back from the return registers. It doesn't do anything for exhaust gases, at least mine doesn't.

That may have changed over the years though as they've tried to squeeze every last % of efficiency out of the oil. But if that's the case, it's a safety hazard since you're just a blower motor failure away CO poisoning.

Mine operates purely on the heat of the exhaust gas.

I see what you're saying though. At the very least though, do what you can to:
a) insulate the part of the chimney that goes thru the attic. It looks like you have a brick exterior. If that's true and it's not just decorative, you probably don't have a lot to worry about until you get into the general vicinity of the attic.

b) besides fire resistant insulation, try to create as wide of a diameter as possible to separate the piping from the soffits and roof.

I honestly think you would have been better off building a masonry chimney, but now you're talking the big bucks. That's how this house was built.

At one point I was a little concerned with CO infiltration since even masonry eventually gets cracks. So years ago I got a buttload of CO sensors. I would definitely advise that for you too. Think of the kitties. Heehee
 

Charmonium

Diamond Member
May 15, 2015
9,950
3,157
136
I really want to get a cat. Maybe I should look into fostering.

If I ever do adopt though, it's going to have to be a bonded pair of kittens. I don't want them growing up knowing how 'groovy' the outdoors are . . . at least in spring and autumn . . . when it's not raining.

That said, I'm not above swooping in and grabbing a couple of feral kittens. Mom will get over it. She probably can't count much above '3' anyway.
 
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