Introduction. Generalities. Conditions that determine the foundation. Foundations of reinforced concrete. Shoes. Tensions on the area. Types of shoes. Admissible load on the area. Admissible and predictable seats. Realized hypotheses. Agreement of signs and units. Elastic behavior of the area. Method of calculation. Determination of the resistance of calculation of the concrete. Determination of the admissible pressure. Determination of the safety coefficients. Determination of the armors of traction. Checking to butcher and punzonamiento. Checking adherence. Checking slide. Checking of I overturn. Tension distribution in the area. Implementation of the EHE. Checking result with the program Metal 3D of Cype.