Drainage for the cellar - does that make sense?

Again and again in damp cellars very quickly thought of a drainage. Whether a drainage at basements makes sense at all, which reasons and which speak against it and what you should always think about, read in this post

Need for drainage

A drainage should always drain water from the basement walls, so that it can not penetrate the cellar later. In many cases - actually in most cases - this is not absolutely necessary.

In principle, DIN 18195 already stipulates that every cellar must have an adequate seal on its outside. The seal must be such that it is appropriate for the particular load (volume of water, pressing or non-pressurized water to the building).

However, if a seal - as provided by the standard - already fulfills this purpose, drainage is generally superfluous. At most, an exception can be made if a soil has very poor seepage (loamy or peaty soil) and the infiltration of rainwater is therefore only possible to a very limited extent.

Basically, however, almost always a correspondingly executed seal (black tub, white tub) is enough to protect the cellar sufficiently from moisture.

Disadvantages of drainages

One should always think of some disadvantages of drainage:

  • often faulty execution
  • high cost, poor cost-benefit calculation
  • running costs

Erroneous versions

Again and again it comes with drainages to faulty versions. The main problems are a wrong slope or the use of wrong pipes.

According to DIN 4095, only so-called bar products, never rolls, may be used. The shape of the drainage pipes is expressly specified in DIN: Type DIN 1187 Form A or pipes according to DIN 4262-1 made of hard PVC.

The use of false pipes means that the drainage can not fulfill its purpose and may even lead to additional water pollution. Since the existing seal is not designed for this additional load, severe moisture damage to the building is threatened here. The same applies to incorrectly calculated slopes.


Drainages are expensive. Although you can use a smaller layer thickness in the execution
allow the sealing, but in practice, the cost of laying a drainage are significantly higher than the cost savings through the lower seal.

Running costs

Drains must be rinsed at least once a year. If this is not done, the drainage can no longer dissipate the accumulated surface or seepage water and there may also be severe moisture damage to the building.

Tips & Tricks

Moist cellars are rarely caused by moisture that penetrates from the outside. A seal of the bottom plate can also help in many cases. Always look for the cause of moisture in the basement first!

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