The durability of buildings is closely related to their protection against moisture. Therefore, in addition to vertical damp-proof insulation, careful execution of the so-called. horizontal waterproofing, the first is placed on the foundation footing, if the basement ceiling protrudes above the ground, we make it under the ceiling. When it is located below, in addition to the ceiling, a third upper one should be made, at the minimum height 30 cm above the ground.