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paulz
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# Posted: 21 Apr 2021 07:24pm
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Since I put in my stove 5 years ago, the double wall pipe runs the distance from the stove straight up to the chimney cap. Ceiling, 15' up, has a 2'x2' framed box using the rafters for the roof jack the pipe passes through. The hole in the sheathing it 2" larger than the pipe. I'm sure a lot of heat gets lost.
My understanding is I can frame a box with 2" clearance and insulate around the outside of that, if it's even worth it since the space would be about a foot all around. Nothing between the pipe and the box.
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ICC
Member
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# Posted: 21 Apr 2021 08:21pm - Edited by: ICC
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Nothing combustible within 2 inches of the insulated Class A pipe and 18" on single wall black pipe, 6" for double-wall black pipe.
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Steve_S
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# Posted: 22 Apr 2021 04:23am
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I used SuperVent(tm) double wall chimney pipe that runs through my Cathedral Ceiling (should have gone through the wall with a T). I got their "Insulation Kit" for the Box which cost way too much considering it is small bundle of Rockwool. Unlike other insulations like Fiberglass, rockwool handles heat and is hydrophobic as well.
Do a quick google search for "JUSI-UNIVERSAL SHIELDING INSULATION"
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Brettny
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# Posted: 22 Apr 2021 05:46am
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I think Paul and steve are useing the term "double wall" pipe wrong. The double wall pipe is actualy two pieces of pipe and not insulated. If that runs through your ceiling it's the wrong pipe. It should be triple wall. This is as long as we are talking about wood stove chimney.
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Steve_S
Member
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# Posted: 22 Apr 2021 06:11am
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My stove pipe from stove to thimble is double walled uninsulated steel pipe. from thimble out it is proper insulated double walled stainless. ALL OF IT is SuperVent(TM) and all code approved & installed accordingly.
I do not know what "Product Line" from which manufacturer Paul is using but most are pretty similar.
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paulz
Member
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# Posted: 22 Apr 2021 06:45am
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I'll have to pull mine apart and check, I don't remember if there is anything between the walls of the double wall pipe, I don't think so. It was running through the ceiling of the house it came out of, fwiw, but that was probably 30 years ago.
Read a bit on the rockwool. Some say you can hold a torch to it.
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ICC
Member
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# Posted: 22 Apr 2021 09:32am
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I think it is better to use the proper term which is Class A for the pipe is is designed to be used for roof, ceiling or wall penetrations. It can be packed with insulation and have 2 walls or it can be hollow air-insulated and is triple wall.
Black pipe is never for through walls, ceiling or roof.
I keep forgetting about Rock Wool as it is harder to find here in the SW.
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NorthRick
Member
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# Posted: 22 Apr 2021 04:27pm - Edited by: NorthRick
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RockWool. I just hauled a bunch of that into my cabin build last weekend.
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gcrank1
Member
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# Posted: 22 Apr 2021 07:31pm
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When the stove is burning and the pipe is hot are you really noticing any heat 'loss' at that point?
Sure this isnt a solution in search of a problem?
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