Drainage around the house - is that useful?

Drainage always seems to be the first inspiration when dealing with a damp basement. Whether this is actually the best idea, when drainage makes sense, and which aspects should be considered, read in this post.

Need for drainage

In most cases drainage at the house is superfluous. In addition, they also pose a risk of massive moisture damage due to design errors during installation, poor planning or inadequate maintenance.

The reason for this is already the DIN. For a new building, the regulations of DIN 18195 for building waterproofing must be complied with anyway. These provide that each cellar is sufficiently sealed, that no moisture can penetrate into the building. To be considered are all possible load cases at the respective building and at the construction site.

This provision, if implemented consistently and professionally, always results in the building being in no danger of accumulation of seepage water. Even with high groundwater levels, the basement waterproofing must be planned accordingly, so that there will be no damage in the long term.

Drainage is therefore practically superfluous due to the specifications of the DIN in order to protect the building from moisture. First and foremost is always the "sufficient sealing" - and that is completely sufficient to protect a building adequately. This should always be done by a specialist - or according to specific technical instructions. Tied floors However, in very poor soil conditions (low infiltration capacity) it can sometimes make sense to lay a house crane. The requirements for the sealing of the building are thereby reduced, the risk of possible damage is slightly reduced.

Sufficient waterproofing can not be dispensed with, however, and the costs of drainage are generally much higher than the possible cost savings in sealing.

Subsequent drainage

In old buildings - unlike in new buildings - there are often no watertight floor slabs made of WU concrete and no adequate waterproofing. The solution here is also the sealing of the building - and not the drainage.

It can also be created, but it must be planned and executed properly. Otherwise, the drainage itself can cause moisture damage to the building.

Tips & Tricks Note that drainage is not only a one-off cost but also involves running costs for flushing. Always calculate this.

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