Tool risk reduction measures


Sealing of ground-reaching buildings; black tanks-image

Sealing of ground-reaching buildings; black tanks

  • Description
  • Fields of action
  • Synergies
  • Good practice examples
  • References

The measure is for waterproofing buildings against ground moisture and seepage water at below-ground structural elements like walls. There are horizontal or vertical sealing methods existing. Horizontal seals prevent that moisture rises up. Vertical seals prevent moisture to enter the building from the sides. There are several solutions available with bitumen (black tank) and with synthetic materials. It is important that vertical seals reach up to 30cm above ground with at least one horizontal seal.

Fields of action Buildings
Synergies may exist between heavy rain risk management measures and other development goals like environmental protection, health care, and economic performance. Harnessing them requires involvement of different actors, enforcement of exchange between you and them and holistic thinking.

Check out the RAINMAN good practice examples:

no good practice example available


  • Hamburg Wasser (Ed.) (2012): Wie schütze ich mein Haus vor Starkregenfolgen?: ein Leitfaden für Hauseigentümer, Bauherren und Planer [How do I protect my house from the effects of heavy rain?: a guide for homeowners, builders and planners], URL: (20.03.2020): Abdichtung, schwarze Wanne

Sabine Scharfe, Saxon State Office for Environment, Agriculture and Geology