Carrying grass to build roofs in Ethiopia

A thatched pub (The Williams Arms) at Wrafton, North Devon, England

Inside view of an Inca roof in one of the few reconstructed buildings of Machu Picchu

Thatching is building a roof with dry vegetation such as straw, reeds, sedge (Cladium mariscus), rushes, heather, or palm branches. The vegetation is put on top of each other so as to make sure water stays away from the inner roof.