Foamed concrete has been used historically as insulation material due to his low density. The goal of this research is to improve this lightweight material so they can be used as insulation materials as well as structural material, with sufficient strength, finding an optimum balance between mechanical and insulation properties so that the material can be used as structural and insulation material for building envelops. As it is well known, all the engineering works requires a resistant and compact concrete. However, in the standards constructions and rural buildings, for example, its required materials and concretes with a good thermal insulation capacity. The thermal insulation capacity of a building material increases as decreases its weight per unit of volume, i.e., the insulating ability of a material increases as it increases the porosity of the material. Therefore, the current concrete, whose advantages, from the technical point of view, resides indeed in its compactness, cannot represent a solution such asinsulating material. That is why, the most interesting feature of the conventional concrete must be replaced in order to achieve a porous concrete. This porous concrete or lightweight concrete is a kind of special concrete whose main characteristic is the porosity. To achieve this porous concrete, it is necessary to make modifications, since the rules that govern the composition of the conventional concrete cannot be applied without further for the composition of the second type of concrete, the lightweight concrete. There exists different procedures to carry out in order to achieve a low specific weight material with sufficient strength. The different procedures differ from each other by the type of aggregate used in the mixing process, for example, it is possible to use directly lightweight aggregates, conversely, to use regular aggregates with standard density in combination with measures that ensure a special concrete porosity. This research is focused on finding a suitable procedure between both ways of achieve foamed concrete with an adequate resistance. The choice of one of the procedures mentioned for the obtainment of lightweight concrete creation depends entirely in the available aggregates and the aim of the research. It is important to mention that there is not an ideal granulometric composition applicable to the aggregates destined to lightweight concrete. Therefore, there are many suitable granulometric compositions for lightweight concrete. This research focuses on the rules governing the manufacturing process of the lightweight concrete in order to achieve an adequate composition of this and, also, to bring the structural characteristic to this material.