In the last century, mainly our cultures destroyed a lot of ourselves as well as of our natural environment by deterioration, pollution and exploitation. Building activities are for a third responsible for these disasters and they are fully the reason for the growing Sick Building Syndrome. In result, Materials of the building should be derived as much as possible from nature, and walls should be made of yellow soil, or of bricks made from yellow soil The adobe can easily have larger or smaller dimensions, and different thickness as weil, according to the purpose for which they are meant, and the structural load-bearing function they have to fulfill. In spite of the importance of clay, research or experiment of clay has been quite weak. However, in stead of endowing the clay with the value as natural architectural material, we want to evaluate it as an important element of the environment.