I’ve been searching and searching and searching some more on the topic of insulation and have managed to find myself in a state of mental nausea trying to sort out what I think is best in my situation; so I finally decided to ask you all.
I am soon to begin construction on a cabin in northern Wisconsin. It is a 1 1/2 story 20’x32′ with cathedral ceilings and a loft above about 1/3 of the back of the building. The loft also has two shed dormers on both sides for extra head room.
I have chosen to go with 2×12 rafters with a ridge beam and am thinking about going unvented.
The usage of the cabin is intended to be 4 season but we will not be heating in the winter unless we are actually staying there so the rest of the time it will be frozen. Heating is going to be primarily a wood burning stove with baseboard heating as backup.
What I _was_ thinking about was a DIY 2-part closed cell foam on the underside of the roof decking followed up by blown cellulose as I read was a possibility in the “Insulate Cathedral Ceilings” article on this site. However, after reading about spray foam shrinking back and exposing the underside of the decking I’ve become terrified of thought of having to replace the roof if this happens as we are springing the extra $$ for a standing seam roof.
Currently I’m wondering if I can fill this space instead with rigid foam followed up by cellulose or if this won’t actually solve anything?
I suppose if someone hear really twists my arm I could be convinced to do the insulation above the decking, but I’m still concerned about the amount of work / cost of doing that will be especially as this is in Zone 6 and requires apparently R25, therefor making my eaves look really strange.
At this point my head is spinning worrying that every option I have is a stupid one..or even that its not worth it for a cabin that will only be heated several times a year in the fall / winter.
Help me come back to reality….
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