On slopes with slopes, they are secured against landslides, most often with retaining walls, stone or brick. In walls made of both of these materials, it is important to drain water from this part of the slope (behind the wall), in which it may fall behind. The proper and easy-to-perform drainage is leaving empty joints in the wall. We leave empty every second or third joint in the first layer above the foundation. Remember to lay waterproofing on a concrete foundation.
