I need a chimney in my shop

[Augus7us]

I have to put a chimney in my shop for my forge and hopefully a pot belly stove.

I'm in the process of framing the walls of my existing building and would like to get this knocked out before I start insulating.

So from researching it looks like I have two options; go out the side and up or go straight up and out the roof.

Option A will be much easier for me than option B, mainly because I will not have to get on the roof. But I don't know which is best or if code would prohibit one or the other. I wasn't planning on having it inspected but I'd like it to be done right.

This will be located up against the wall and if possible I would like to have a "Y" up top so I can branch off from the forge and tie into a stove.

What say you guys?

-Clint

 

[astroracer]

Going straight up is better. Less chance for back drafting and it keeps the hot pipe out of the way. I would check into the code to see if a double or triple wall pipe is required thru the wall or roof. If you go out thru the wall I would think a triple would be required to keep someone from being burnt on a hot flue... Just thinking out loud here...
Mark

 

[6768rogues]

Straight up is better than going out and up, but either will work. Out and up is easier to clean, because you can use a cleanout Tee on the outside. Our code does not allow two devices or appliances to be connected to a common flue, unless they burn natural gas or propane. A solid fuel device (coal, wood, pellets, etc.) has to have a dedicated flue.

 

[Augus7us]

Thanks guys. What would I look for as far as code? I've never looked up anything like this and not sure who or what governs it?

 

[Jackfre]

Gas or coal? Advise on vertical is correct. I cannot advise on the diameter of the flue. It will be regulated by NFPA 211. You will be able to use factory built chimney. The taller the flue, the better the velocity up the stack. Another issue affecting diameter of the stack will be how large the hood is over the forge and I think it’s height above the rim of the forge. You have so much dilution air that it requires that latter sizes are generally required. I would suggest Dura-Vent or Selkirk. I represented both of them over the years. Contact customer service and ask for engineering. They may be able to help. As well, your friends who have done this can give you advise on do/don’ts.

 

[Bretny]

Another vote for vertical. If you put any 90*s in a chimney it allows the smoke to cool. Cooling smoke makes cresote, that causes chimney fires. It also makes for you having to clean the chimney more and the 90* make this for a real pain in the ****.

Use tripple wall 8in pipe. Northline express has 4ft sections for prety cheap along with all the flashing and adapters you will need.

 

[Jackfre]

Bretny. where do you come up with the 8"? Not saying you are wrong, just curious. Also, I just re-read the original post. Multiple appliances on the same flue for solid fuel is not allowed. Can it be done? Yes, (you could put a damper in the breech of the forge hood and tie the stove vent connector in above that) but your insurance company will not pay out if anything goes wrong. Putting the forge against the wall is questionable too. I guess it depends upon how much protection (air gaps) you put on the wall. When you heat wood to a high temp repeatedly you actually reduce the kindling temperature of the wood.

 

[Bretny]

8in because you can always change it to 6in if the stove needs that. If the stove takes 8in and you have a 6in chimney your SOL. I dont know anything about your specific code in the area.

 

[Jhoff310]

This will be located up against the wall and if possible I would like to have a "Y" up top so I can branch off from the forge and tie into a stove.

What say you guys?

-Clint

Follow the clearances on your stove and you should be ok. Definitely check with your insurance company, most insurance companies wont insure a garage with a stove.

Your "Y" will be an issue with code. most code calls for 1 chimney per appliance..

 

[HOTFR8]

Antother for going straight up if you can. Also the taller you can make it the better it should draw air.

 

[930dreamer]

For wood stoves double or triple wall going through the roof with a ceiling box/ kit. The pipe below the ceiling box can be single wall pipe as it will add heat coming off the chimney. If you don't like the rusty look use double/ triple wall but more $$$.

A few post where the insurance company was good with a wood stove but they required it to be 18" off the floor.