42. Placement of the elements that hold up the building. They are made of mass and reinforced concrete. There are three types: zapatas, pilotes and losas. By excavators and cranes.
43.
44. The pillars and the forges are constructed. Pillars are made of reinforced concrete. The forges are made of beams and vaults. Machinery: cranes.
45.
46. It is the placement of the roof of the building. It depends on the climate of each place. It has insulations. There are 2 types: