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Country Discussion Topics
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Requirement for chimney in metal agri building
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Brian    Posted 10-16-2004 at 17:27:40       [Reply]  [Send Email]
I look at the class A chimneys and think if I go through a metal skin, is this necessary?
What are some good ways to put a wood burner chimney in a simple metal agri building without breaking the bank?


Lazy Al    Posted 10-17-2004 at 05:40:15       [Reply]  [No Email]
Brian
Along with what's said down below about distances from combustibles and boots .
If you plan on having a plain stove pipe above the roof , I think your asking for a creosole build up
You know you should the top above the peak by two foot or 10 foot horizonal to the roof . So the part sticking up above the roof , if just plain stove pipe will cool off and encourage a creosole build up . A hot chimney helps keeps down the build up .
As the wind blows on a surface it builds up pressure higher then the surrounding air . so if you have a chimney in that area it will blow right down your chimney . Same as around your windows as the wind blows the pressure is higher on the out side of your window than on the inside .
So if your window is leaking the wind blows through it but it is also sucking it in from the room inside .
That's my opinion and I'm sticking to it
Al


Salmoneye    Posted 10-16-2004 at 18:13:08       [Reply]  [No Email]
Keep the stove at least 3 feet from combustibles if possible...18 inches will work with approved baffles/insulators against walls etc....Run straight, single-wall pipe from the stove to the roof...Where you go through the roof, spring for one 3-foot section of 'metal-bestos' (appx. $50-$100) or the equivalent (NOT double, or triple-wall pipe!)...Keep the insulated pipe centered between roof joists and have 2/3-3/4 of the insulated pipe inside the building with less than a foot poking through the roof...Get a storm collar and seal it around the exposed pipe above the roofline...This is usually a two piece combo of a 'boot' and 'collar'...Seal so they won't leak...If you have to cut down one of the inside lengths of pipe to make the insulated piece sit at the right height, do so...

Way easier to draw on a cocktail napkin than to explain on the internet...

;-)

PS.....This ONLY applies to going through a single layer metal roof!!!!!!!!!!!!!!!!


Ron/PA    Posted 10-16-2004 at 19:08:32       [Reply]  [No Email]
I think space ships have been built off of cocktail napkin drawings.
Ron


Pretty sure...    Posted 10-17-2004 at 03:49:49       [Reply]  [No Email]
That Columbus handed Izabella a doily with some scribbling on it as a ;Business Plan'...

;-)

Salmoneye,


Brian    Posted 10-16-2004 at 18:24:54       [Reply]  [Send Email]
This sounds like excellent advice. I agree a drawing would be better but you paint a great picture with your written description.
Thanks


PS...    Posted 10-17-2004 at 04:11:44       [Reply]  [No Email]
The main reason I suggest a piece of insulated pipe for the roof area is that you want to keep the hot pipe away from the rafters...If your joists are 2 foot on center, you only have at best 8 inches or so (with an 8 inch stack)...The insulated pipe will keep the hot-single wall below, and away from the rafters...

You should also knock together a rain cap...If you are handy with tin and rivits, it is simple to make one that looks like this:

Won't keep out birds, but will keep rain from coming straight down the chimney...



Brian    Posted 10-17-2004 at 19:35:55       [Reply]  [No Email]
I can do alright with Tin. As for the birds, I also know what a good layer of wire mesh can acomplish.
Again, Thanks


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