Table 3 Building materials Countries/Regions Houses wood US, Canada, Russia log cabins ( 圆木小屋 ) 1) wooden houses with large beams ( 梁 ) and carved balconies 2) curved roofs with carved wooden brackets ( 托架 ) paper & wood 3) traditional paper-and-wood houses with sliding panels inside 4) Africa, some islands in the South Pacific Ocean grass huts with thatched roofs 5) the Arctic dome-shaped igloo adobe bricks (sun-dried bricks) 6) adobe houses 7) all over the world brick houses stone many parts of the world (thousands of years ago) 8) 9) cottages, huts steel & concrete 10) ceilings, floors and beams of reinforced concrete, prefabricated parts