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[–] observation1 0 points 7 points (+7|-0) ago  (edited ago)

Roof is birch bark which is waterproof . Grass sod holds the birch bark in place and its heavy so the structure becomes super sound, well-insulated, and naturally waterproof. Lasts basically forever.

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[–] chirogonemd 0 points 3 points (+3|-0) ago 

That's awesome.