Detail of roof construction inside church at Cotasaya, Sajama National Park, Bolivia
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Detail of roof construction inside church at Cotasaya, Sajama National Park, Bolivia
The roof beams are Polylepis tarapacana trunks, the thatched roof is made from ichu grass (Festuca orthophylla). The beams and thatch are lashed together using rope made of strips of dried llama skin.