Good evening. I’m getting ready to install my jotul f3 in a small cabin. I have a cathedral ceiling with no attic space. Area between rafters will be spray foam and finished ceiling will tongue and groove. From what I’ve been seeing, I need single wall from stove to cathedral support box then double wall from there? Do I need a support box? How do I know what size support box to buy? What’s the code for my height after exiting roof? Thank you in advance for any help you can give.
Wood stove install
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If the run from the stove to the ceiling is long, people recommend a double wall instead of a single one. A long run with a single wall lets the gases cool too much. It can affect the draft, and you can get more buildup in the pipe.
Ctwoodtick
Minister of Fire
I don’t believe single wall is recommended…..ever. Double wall from stove to support box. Class A chimney from support box up.
This is a perenial confusion of terms. Stove pipe comes in single-wall and double-walled with an air gap between layers. Double-wall stove pipe is strongly recommended if the run is long (>8'). Chimney pipe comes in double-wall with packed insulation between the layers. Or it comes in a value-line, triple-wall, with less insulation between the inner two layer and then an outer layer with an air gap.
Yes, you will need a cathedral ceiling support box. Stove pipe is only used within the room up to the support box, then the flue transitions to class A chimney pipe which is supported by the support box. At the roof, the 10-3-2 rule must be honored.
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