Stove Pipe length question

  • Active since 1995, Hearth.com is THE place on the internet for free information and advice about wood stoves, pellet stoves and other energy saving equipment.

    We strive to provide opinions, articles, discussions and history related to Hearth Products and in a more general sense, energy issues.

    We promote the EFFICIENT, RESPONSIBLE, CLEAN and SAFE use of all fuels, whether renewable or fossil.
Status
Not open for further replies.

SolomonsCommune

New Member
Dec 6, 2014
6
Maryland
Hello! New to the forum. I have a couple questions I'd like to ask, and hopefully someone can help and I'm not asking something that's covered all the time.

I'm a carpenter. I built my house in 2011. It's a 2 story and in the center is my stairwell as well as a big opening to the 2nd floor. I always envisioned putting a wood stove up against the stairwell wall and running the pipe up to the 2nd floor ceiling and on through the attic space and roof. My main question is it's 18ft from my 1st floor (floor) to my 2nd floor ceiling. Am I alright to install a stove pipe (single or doublewall) all the way up? Doing a rough breakdown in my head we'll say the stove sits close to 36in off the floor. That means that my stove pipe would come from the top of the stove and travel 15ft (18ft -3ft) just to get to the 2nd floor ceiling and then another 7ft just to get to the roof through the attic space. I assume 2 ft once it's gone through the roof would be appropriate considering the stove would sit roughly in the center of my house which would put the pipe very near the ridge of my roof.

Just for rough number sake, I'd be running a 24ft vertical pipe. Is that safe or even possible?

If so do they make longer than 4 ft length black single or double wall black stove pipe?
 
Welcome to the forums!

Wow. That seems like a long vertical run! In Canada, CSA standards state that the maximum overall length of straight pipe is 3 m (10 ft.). Perhaps offset and go through the main floor ceiling with an adapter into a class A?

Yeah, 3 feet is as long as they come. I have never seen a 4 foot piece..

Andrew
 
Yes, double-wall connector pipe is recommended for long runs - as long as the pipe does not cross a room barrier like a wall or ceiling.
 
Welcome to the forum SC. Forget those 24 feet. You will run about 15 feet of double wall and then you will be at your ceiling support. The ceiling support will carry the weight of the approximately 10 feet of chimney. Local codes may impact your path selection as Swedishchef said, but nothing in a normal install will be holding up all of the 24 feet of pipe. The double wall connector and the chimney connect to each other at that ceiling support. The ceiling support is carried by a frame of 2x lumber that is flush on the bottom with your trusses and forms a box that is 1 foot square on its inside measurement. That square box is in turn supported by your trusses so that the chimney load is transmitted to the lower chord of the trusses through that box and the metal chimney support. I used 2x6 lumber but I cheated and installed the ceiling support box before I closed in my ceiling. I just spanned between 2 trusses then nailed in the other 2 2x6 boards to place the square right where I needed it. The supports are made to fit with a decorative trim under a finished ceiling so I had to put a 4x4 foot piece of drywall in place in order to get everything to come out right when I inserted the ceiling support itself and attached it to my box framing. The attic insulation shield fits on top of the chimney support and the chimney pipe slides right through it to the support itself. Supports are rated for very long runs of chimney so your 10 foot total will be just fine. Note: go back and read your chimney install instructions/specs. You need to meet both the 2 foot and the 3 foot requirements. It is not either/or. The 3 feet above and the 2 feet minimum must both be met.
 
Status
Not open for further replies.