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bwalak
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# Posted: 12 Feb 2017 02:35pm
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Hello
I built a small cabin (12'x14" with a loft) I plan on heating with a small coal/wood stove. I will be having the 6" stove pipe go through the wall and then outside to a section of single wall stovepipe for a chimney.
I do not want to spend the $2000+ dollars on stainless steel double walled stovepipe set up.
Can I:
1. Use single walled pipe going through an 8" wall thimble where the inner 6" stovepipe has been wrapped with high temp insulation?
2. Buy a small section of double walled pipe and the place a thimble through the wall and have my single walled pipe go through my double walled pipe?
This does not have to be to code
Or can I just connect single walled pipe to double walled pipe as it goes through the wall then switch back to single wall once it's outside?
Thanks
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toyota_mdt_tech
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# Posted: 12 Feb 2017 02:43pm
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I think from thimble outward needs to be the spendy double wall. Can you exit via the roof, preferably near the ridge or just under it? You will need the least amount of stainless double wall, it would be the cheapest route too. Then to top needs to be 3 feet higher than the ridge or 10 feet from cap to roof (this would apply if you were further down the roofline. I always thought a pipe poking out a side wall was ugly. IMHO
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Greenland South
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# Posted: 12 Feb 2017 05:34pm
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If you do what your planning you'll burn your cabin down. Maybe not the first time you use it, but eventually it will happen. Installing any wood burning appliance to anything less than "minimum" code is just stupid. Yes I said stupid.
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bldginsp
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# Posted: 12 Feb 2017 05:36pm
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You are re-inventing the wheel. Yes, you can do those things, but will it start a fire? You and your loved ones are the experiment.
The main cause of woodstove fires is clearance to combustibles. The spendy double wall pipe reduces that clearance. Any single wall pipe should have at least 18 inches clearance to combustibles in all directions. That's not an easy thing to do. The termination of the pipe should be 2 feet vertically above anything within 10 feet horizontally, to keep sparks off the roof.
Over the years and many woodstove fires, the manufacturers and others have found a basic system that works well, and gives peace of mind. I wouldn't do it otherwise, partly because it violates code, but mostly because it's flat out dangerous.
I've seen different stovepipe and chimney components for sale on Craigslist for cheaper prices. The galvanized triple wall costs less than the stainless. Rather than trying to design your own experimental system, I'd be looking for ways to use a standard system less expensively.
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groingo
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# Posted: 12 Feb 2017 06:21pm
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There are affordable through the wall insulated isolators but in reality you would be better off running the pipe straight up through the roof....the longer the run the cooler the pipe and they are much simpler to build and a lot less expensive too as you typically only need the double wall insulated pipe for through the roof....I used 6 feet total which was only $119.00.
Now I really confuse you by saying you would be far better off with a vented Propane heater...takes up much less space, no wood mess and hassle and waaaay easier to control and cheaper too....dump the wood stove and go Propane....I did after over 30 years of wood burning with no regrets.....took the wood stove out and was amazed how filthy things were because of it and it was a clean burning Waterford!
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MtnDon
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# Posted: 12 Feb 2017 06:51pm
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Small cabins lose a disproportionate amount of floor space to a safe wood stove installation. That is something to think about when looking at the chimney cost for a wood stove. Groingo's suggestion of propane is an idea worth considering. A direct vent, through the wall heater comes complete with all the venting required. Some models do not need electricity as they work fine w/o a blower. Northern Tool sells a couple of Housewarmer models like that.
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bwalak
Member
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# Posted: 12 Feb 2017 07:27pm
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Thanks guys,
Could I use a thimble and double wall pipe to go through the wall then change back over to single wall once I'm outside as long as I am 18" from the house?
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creeky
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# Posted: 12 Feb 2017 07:40pm
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Quoting: groingo you would be far better off with a vented Propane
Quoting: MtnDon floor space
Now that's good advice. (I know. The old fire in the woodstove. Looks and feels so nice.)
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MtnDon
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# Posted: 12 Feb 2017 10:37pm
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Quoting: bwalak change back over to single wall
That will cause huge amounts of condensation on the inside of the single wall pipe. Which will lead to all sorts of problems. The rapid cooling of the chimney gases once the hit the single wall portion outside, will also cause a drop in velocity of the gases out the pipe. That can aggravate the draft which is already being aggravated by the bends as the chimney goes through the wall and then back to vertical.
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groingo
Member
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# Posted: 12 Feb 2017 10:47pm - Edited by: groingo
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I had a through the wall stove but had problems for years, first was drafting issues then came constant creosote and condensation buildup in the 45 degree elbows and reguardless of the thickness of the 6 inch pipe I always had to replace the elbows and two sections of straight pipe every year due to rustouts.
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