Well, 15 hours is a bit too long for me lol.
The only thing I have heard so far that stands out different is your location. We have users here on coastlines but not many on islands and I think none on northern Atlantic islands like yourself.
I did a quick lookup of some basic climate info on your area (PEI right?) and find the rainfall to be comparable to my location, and similar in snowfall (a little less).
The one thing I did notice though is that your humidity is much higher during the cooler months than where I live:
My area:
Your area:
A high humidity during cooler weather would most likely definitely be more likely to encourage moisture/mold.
That is one thing that stands out for me. If it were me, I would try dehumidifying the room to 30% (comfortable) at all times.
That's all I can come up with, with my limited observation on your particular circumstance.
My neighbor has a house he built himself a few years ago. I see today they were ripping off his roof, plywood too. It turns out he never vented the attic (DOH!). It rotted out a lot of the wood up there. It can happen in more than just yurts apparently.
Re: R-value?
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