Drainage: where is it necessary?

Again and again there is uncertainty about where drainage is needed and where not. What conditions make a drainage necessary, and where you can do without it, read in this post. In addition, which advantages and disadvantages can have drainages.

Basically necessary?

In general, it can be dispensed with drainage, in most cases, it is unnecessary. This applies to the new building as well as most older buildings. For old buildings in particular, because earlier the building sites for a house, but also for cellars were almost always chosen so that the water pollution was low.

Drainage at the new building

The new construction has two aspects:

  • Basic foundation on water-impermeable so-called Sohlplatten
  • adequate planning of the cellar for construction areas with a high groundwater level
  • Bath constructions with sufficient sealing

Drainage in old buildings

For old buildings you have to take a closer look at the construction technique. As a rule, the floor structures, in particular the ground which lies on the ground, are not impermeable to water but mostly water-permeable. Floors were usually slightly compacted on the outside, so that only capillary moisture collects here. Moisture can not be removed by drainage anyway.

The installation of an enclosure would be counterproductive in this case. In many cases, the floors would be burdened even more with moisture on the outside and it would come to a constant entry of moisture into the building. The basement would not dry, but even wetter.

Invading water is rarely the problem, not even pressing water. Problem for many damp cellars is more the capillary moisture. This is not where drainages help, but appropriate waterproofing.

Advantages and disadvantages of drainage

As an advantage of a drainage, the lower requirements for the sealing of the cellar (reduction of the layer thicknesses) can be seen: The disadvantage is, above all, that a drainage anyway would cost significantly more than the reduction in the layer thicknesses of sealing materials saves. Incorrect installation or incorrect drainage planning often causes major problems. If, for example, rolls are used instead of bar stock for the pipes, no defined slope can be laid. But that is unavoidable and so demanded in the technical rules.

In addition, drainage must be flushed regularly (at least once a year is recommended), otherwise they will lose their function if they are in the ground for several years. This in turn can be very detrimental to the building.

Tips & Tricks

Drains should always be designed so that as little water as possible is removed. This means: Always close the end of the drainage pipe with the height of the foundation (upper edge) and drainage height in the collecting shaft very precisely.

Video Board: Planting & Watering Succulents In Pots with No Drain Holes / Joy Us Garden