The roofs in Västerbotten are made of birch bark, on top of which they do not lay turfs but round poles as thick as an arm. These rest against the roof ridge from opposite sides and are pegged together with about 8 inches standing clear in a crossshape at the top. At the bottom, where the poles are thick, they almost touch each other. There is a sort of ceiling made of moss and earth inside that, but only over the parts of the house that they want to keep warm.