The construction of a house from foam concrete requires additional decoration of all supporting structures and partitions, since the building material sensitively reacts to moisture. It is recommended to use plaster as a protective agent from carbonization and humid shrinkage, preventing the appearance of cracks to limit air flow access. Choosing a plastering coating for the finish of the house, you should remember the precautions, since this finishing material can, how to bring benefits and protection, and harm even more foam concrete walls, violating their natural indicators of thermal conductivity, vapor permeability, frost resistance and physicochemical characteristics. The wall plaster used for foam concrete should have a high degree of vapor permeability, which is expressed in the ratio of the thickness of the layer of material. This property allows the walls to breathe, and foam concrete remains intact, without cracks and defects. If in the process of evaporation the moisture is frozen and thawed in the structure of the walls, then the surfaces are quickly cracked, moldy, and the plastering finish will simply disappear. Traditionally, in the construction business, the internal layer of plaster is twice the outer coating, one for foam concrete walls does not have to withstand such indicators, limiting himself to the thickness of the outer layer of 10 millimeters and internal – 20 millimeters. The plaster layer dries very quickly on foam concrete walls that do not absorb moisture, so that the surface is perfectly flat and smooth.