The most frequently performed drainage is the so-called. belt, where drainage pipes are laid in the trench around all walls of the building. The pipes should be laid not shallower and not deeper than the strip footing. Drainage pipes are placed on 10-15 cm layer of crushed stone or washed gravel and covered with the same material completely. A layer of approx 20 cm. Before backfilling the trench, a filter mat, the so-called. geotextile.
