Exterior, Concrete Siding Material, Flat RoofLine, and House Building Type The walls and ceiling structure rest upon two longitudinal beams of the same length, which have been placed under the floor slab. The same four walls that support the ceiling extend past the floor slab to create the base level for the bedrooms on the south end of the house. 

  Photo 2 of 14 in This Chilean Concrete Home Levitates Off a Coastal Slope