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Smawgunner
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# Posted: 26 Oct 2015 19:14
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Our antique cabin has a sandstone block with a hole in it that goes between the first and second story. It was meant to insulate stove pipe. The thing is huge,...6 inch walls. So the single wall pipe will go from the stove, up through the stone and connect to the double wall that goes through the attic and out. That part was professionally installed. So do I start at the top and add sections down to the stove? It's about a 10 foot run. I am picturing the weight of it letting go before I can connect the last section. OR do I start at the bottom and go up? The problem with that is how to hide my cut. The cut should sit in the stove collar. Thoughts?
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Smawgunner
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# Posted: 26 Oct 2015 20:56
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I think I answered my own question. I guess I didn't realize these were connected with self tapping screws. I'm an idiot,...never done this before.
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bldginsp
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# Posted: 27 Oct 2015 08:51 - Edited by: bldginsp
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Not sure I understand your description, but are you aware that the female ends of the stovepipe must always point down so that creosote always drips into the stove and not out through the joints? I was unaware of that one and might have done it differently....
I saw the photo of your stone thimble before and it raises 2/3 of one of my eyebrows. It was a very crafty and labor intensive solution that the builders came up with to the problem of sealing the pipe around the floor, but without overheating the wood. But stone can overheat just like other materials, and with a stove going continuously I wonder how hot it might get. But, given that you have worked so hard to insulate the building which they did not have 100 years ago, you probably won't use the stove as hot as they did, so you won't heat the stone thimble as much as they did.
But the basic idea with stove pipe is that it connects the stove to the chimney IN THE SAME ROOM and never passes through any floor or divider. So, technically I suppose, passing the stovepipe through the stone thimble goes against the common installation methods developed by manufacturers (and against the code).
It's such a unique piece of stonework though. It would be a shame to replace it with an expensive piece of modern chimney, particularly if the stone is working just fine as is.
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Smawgunner
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# Posted: 27 Oct 2015 19:53
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Good memory! I did end up putting metal flashing between the stone and wood joists/flooring so hopefully that'll help. I did watch lots of youtube on the installation, but did have one question...does the pipe just sit into the flue on top of the stove? It doesn't need an adapter of some sort?
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bldginsp
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# Posted: 27 Oct 2015 23:02
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My Morso stove came with an adapter for standard 6" stovepipe. I don't know whether this is required for all wood stoves or if some are made to receive the pipe directly on the casting.
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Smawgunner
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# Posted: 28 Oct 2015 07:08
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I wanted to edit my last question but it was too late. So I'll be running sections of pipe down from the chimney and when I get down to the stove I'll have to cut off the male end to get it to the correct length. Is that going to make a tight enough seal seated into the collar on top of the stove?
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bldginsp
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# Posted: 28 Oct 2015 08:19
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I can't say, but I do know that they make telescoping sections of stovepipe to accommodate the specific height dimensions of each installation. They make telescoping sections for both single wall and double wall stove pipe. I don't know if cutting the pipe yourself will work.
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FishHog
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# Posted: 28 Oct 2015 08:26
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I've cut pipe off to the right length with a dremel tool. But you don't want to cut the male end off if you need the male end for the connection. If it doesn't need the male end and the straight connection is what you need then sure you can cut it off. But the open end is not sized, it is just straight pipe, so cut that end and you can make the length whatever size you want and still have the correct ends. (not sure that made any sense).
Its a wood stove. If its an older one you don't need air tight connections, the air flow will pull air in, not let smoke out. But you can also buy high temp silicone to seal it up if you wish.
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