Can you use a single wall 8” stovepipe through a metal ceiling

[Swingpure]

Last year I had a 6” stovepipe that went out the back of my cinderblock evaporator and ran outside of my metal roof. This year I will be having a base stack with an 8” stovepipe that will go through the metal roof. The only flammable items near by would be the trusses that would be 8” away from the pipe.

Can I have a single wall pipe go through the metal roofing, or do I have to use a double wall section of stove pipe?

If I am allowed to use a single wall stove pipe, is simple flashing enough on top of the roof?

A single 3 foot section of double walled 8” stovepipe costs almost as much the base stack itself.

Thanks for any advice you can give.

[aamyotte]

I had a small fire from a 8" single wall chimney with wood 12" away from the chimney. I was using a blower so the stack temp was higher than natural draft.
It would be better to use double wall chimney.

[wvfdc4]

Rule of thumb from a fire department perspective (inside a house) is that single wall needs a 16" clearance to combustibles. Insulated double wall is a 2" clearance. Not sure if that is gospel in a structure like yours, but that is my $.02

[Pdiamond]

I believe you should check and go with your local fire codes.

[Z/MAN]

I have single wall going through the metal roof. I have a 10" stack and my rafters are 16" on center. I have my rafters insulated with arch board and never had a problem. My base stack glows red at near 2000 degrees. I'm not telling you to do the same, just telling you it works for me.

[Swingpure]

I have single wall going through the metal roof. I have a 10" stack and my rafters are 16" on center. I have my rafters insulated with arch board and never had a problem. My base stack glows red at near 2000 degrees. I'm not telling you to do the same, just telling you it works for me.

What do you use on the top of the roof to keep the rain out?

[Z/MAN]

What do you use on the top of the roof to keep the rain out?

I actually just cut the hole and put the pipe through. Very tightly. It leaks during the season and when the season is over I run a bead of silicone around the pipe sealing it for the summer. My shelter is just a roof coming off the side of my garage that has some temporary walls added. It has evolved over the years to a decent setup. Can't find the time to build a real Sugar Shack.

[ebliese]

I have an 8" single walled pipe going through a metal roof. I used a roof jack (flashing) and a storm collar. So far, I haven't found any sealant for the storm collar capable of sustained, high heat so my stack leaks (which I am working on fixing). I have about 18" clearance to combustibles. This I accomplished by removing a section of purlin between two rafters. Even then, I covered the structural lumber with insulation. My stack temps generally fall between 900 and 1200*F.

If you stick with single walled pipe-DO NOT wrap insulation around the pipe. It will catch fire. Don't ask me how I know. The pipe needs air.

If you buy double walled pipe-yes, it would be expensive, but not as expensive as building a new sugar shack.

As others have referenced, check your codes.

[Swingpure]

I went to a local hardware store to talk stovepipes and to a local fireplace store, and talked to two friends and also talked to the gentleman who I will be getting the base stack from. Confusing information, but I think I learnt a few things and know what I want to do, almost.

I learnt that at least in our area, what you call double wall stove pipe is different from chimney pipe. Double wall is for inside the building and chimney pipe is for outdoors, but could be used indoors as well.

You have to support the chimney pipe.

What is not clear to me, some say the single wall pipe can fit directly into the chimney pipe and others say you need an adapter that is made for a particular manufacturers chimney pipe.

The gentleman who I am buying the base stack from says the single pipe can go directly into the chimney pipe, and he may have some reasonably priced chimney pipe, so I may just get it all from him.

I will have the base stack, then add on the chimney pipe. I will build a redneck support for the chimney pipe. And it will go through a fairly tight hole in the metal roof and I will have a storm collar for the chimney pipe.

[wobbletop]

I found the Selkirk product line the cheapest when I was looking. You can also call their technical help line to get information on your install.

I also found their manual helpful. https://www.selkirkcorp.com/literatu...Guide_-_US.pdf

The single wall pipe is secured by your heater at the bottom, then attaches to the adapter that fit's at the bottom of your ceiling, and then it's double wall insulated from there up. The outside chimney must be supported if it's beyond a certain length. I didn't need to.