Insulation sleeve value for space in flat roof


Old 11-01-20, 03:36 AM
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Location: Canada
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Insulation sleeve value for space in flat roof

I'm unable to vent out through the side wall so I need to go through the ceiling.
There is about 10" of ceiling space and then above that the unconditioned space just below the flat roof.
it's heated a bit by the house but it's mostly open to the cold winter through its vents and a gap in the side.
What r value would be enough to sleeve a kitchen 7" vent to stop condensation?
R8 doesn't seem like enough.
The exit will go into the soffit area and then down so it's exhausting to outside air

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