Unpopular opinion: Packed wool insulation in cold countries is asking for trouble
I was in Norway a while back and saw how they stuff wool into log cabin walls with no real seal. The locals said it breathes well and handles their dry winters. But I spotted moisture stains and a musty smell in a cabin we visited. In my concrete work, I see how water damage creeps in, and insulation is no different. I think skipping a proper vapor barrier is a huge mistake, even in dry climates. One wet spring and you've got a mold farm inside your walls. We should share tips, but not copy methods that ignore basic moisture control. Always tailor your install to the actual weather, not just tradition.