Flue pipe Clearance ?????

[JeffB]

Hi

A little bit of my story, built a new shack, installed the stove pipe and roof jack, placed arch in shack and at that point noticed the 8 inch flue pipe is a little close to the trusses and rear of arch is even closer to rear wall then flue pipe.
Moving arch forward to gain more clearance is not a option at this point.
After some research here and online i made a flue pipe heat shield that cover the rear of my stove pipe with a 1 inch air gap between pipe and shield. They say doing this i could reduce the minimum clearance to combustible material by 65 percent.

I then made another heat shield from floor to roof with a 1 inch space between wall and shield for air movement.

SO... basically i have a flue pipe with a heat shield then 4 inches behind that i have a wall heat shield running up the walls entire length with another air gap then the wooden wall.

My closest combustible material from my flue pipe is 6 inches without any shielding i plan on covering that small area of framing with arch insulation blanket.

Any thought or suggestion i can use to improve on this would be great , I really don't want a set fire to my new shack.
Cause that would be a BAD DAY !!!!!

[wishlist]

Just a thought , would double wall stove pipe be an option ? The clearance to combustibles is 6" and they make it in 8" .

[maple flats]

Every time you add a non combustible layer spaced 1" on non combustible spacers you cut the clearance needed to half. Unprotected wood and other combustibles need 36" clearance. Using sheet metal on 1" non combustible spacers, 1 layer gives 18", a second layer spaced 1" again cuts it to 9" and a 3rd layer gets you to 4.5". The other method is to use 2" ceramic blanket insulation, that is what I did to protect my trusses, the back wall on my sugar house has 5' clearance.
For my stack pipe I have a 12" stack and I made a sheet metal wrap that is 16" OD. In the space between I have 2" ceramic blanket.

[JeffB]

Ya thats what i was thinking , putting insulation between flue pipe and 1st heat shield, in area near roof trusses and copula framing would do the job. the other option i was thinking of was keep the floor to roof wall heat shield, then wrapping my whole stack above the collar on my base stack, securing that with mechanics wire (be ugly tho) then just running a heat shield behind the base stack.

[buckeye gold]

I have plenty of wall clearance, but even after I boxed around my rafters it was too close to wood. So I wrapped the stove pipe with arch blanket down to two foot below rafters and slipped a larger pipe over it and screwed it to the inner pipe. I can literally lay my hand on it while cooking.

[JeffB]

That sounds like a great idea and a hell of alot better looking with the pipe wrapped around the insulation, rather then have bare insulation staring at me all day .
So the insulation is now added to my never ending shopping list at the CDL store.
PLEASE DONT TELL MY WIFE I HAVE ADDED TO THE SHOPPING LIST !!! LOL:lol:

[maple flats]

I bought a roll from someone like this: http://thermal-industrial-ceramic-products.thermalproductsco.com/viewitems/thermal-products-fiberfrax-blankets/lanket-2600-2600f-ceramic-fiber-blanket-insulation
Compare prices to get the best price, CDL may not prove the best. I used 2600 F but there is also a 2100 F rated one too. I just like being a little extra safe.
On my stack I had it sliced the over wrap every inch cutting 2" deep, then after installing it, I folded those tabs in so the bottom edge is covered too. On mine the wrap is only 30 ga. galvanized sheet metal, SS was too pricey. I think if I ever change it I'll use SS next time, but the original is in it's 3rd season and it still looks like new.

[Michael Greer]

I added two layers of bigger and bigger diameter pipe to my flue pipe, creating my own "triple-wall". This triple wall runs all the way up and into the roof jack, which has ventilation holes below the storm collar. I was worried as to whether it would work, so I attached one of those magnetic flue thermometers to the outside. When my flue is showing 800 or 900 degrees inside, the outer layer of my home-made triple wall is showing 75 or 80 degrees. A one-inch air space with free-flowing air between is the trick that works.

[maple flats]

That was how I did my first stack set ups in my sugar house, While not as neat, it was very effective. In our town we need to get inspected with any solid fuel burning device, the fire dept. liked the method.