Problem analysis

Moisture that diffuses upwards

Moisture underneath the floor slab in the ground is completely normal. Under certain circumstances, this moisture can also diffuse upwards through the base plate. The result is often a damp cellar. Drain Against this problem (load case: diffusing humidity) drainages always have no effect, because drainage can only divert liquid water. Here only helps a corresponding sealing of the bottom plate.

There are often quite simple options available for this:

Mineral sludge (multi-layered coatings)

Loosely laid, untreated wooden floorboards to regulate the humidity climate (preferably hardwoods)

  • Sealing membranes (often not necessary in this load case)
  • All these options are quite cost-effective too realize.
  • Capillary moisture

The same applies if the cause of a damp basement is capillary rising moisture in the basement walls. Also, this type of moisture can not be dissipated by a drainage anyway. The soil can not be "dried out".

If you want to drain the cellar, you have to pay attention to a sufficient horizontal barrier.

Pressing or strongly pressing water under the floor slab

In these load cases, the requirements for the subsequent sealing of the floor slab are significantly higher and the costs for the sealing are also generally considerable.

Drainage is not a real solution in this case either. On the contrary, they can even be rather counterproductive, since the soil moisture can increase significantly after installation. Problems with diffusing moisture often only increase and often become unavoidable.

Drainage below the base plate

In addition, care should always be taken that drainage


should be installed below the base plate. The upper edge of the drainage pipes should always be flush with the foundation edge. In this way as little water as possible

is derived. This is a basic requirement for drainage, which must always be adhered to during planning. Tips & TricksPlease also keep in mind that improper planning or execution of the drainage may subsequently result in serious problems. Especially wrong tubes (rolls) are common mistakes here. In addition, drains must be flushed regularly (at least once a year) to maintain their function.

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