Seal the basement afterwards - but right!

Before a subsequent sealing can be carried out, the circumstances must be assessed correctly. This mainly includes the type of moisture, the so-called load case. The different species must also be sealed in different ways.


Here are the different forms that can occur in the basement of moisture. It is important to know the exact cause in order to really get to the root of the problem.

  • rising damp
  • Leachate not jamming
  • Accumulating seepage water
  • Pressing water
  • groundwater

Bitumen thick coating

A bitumen thick coating, which is troweled from the outside, is basically a good idea. But it does not help if it is soil moisture or groundwater.

However, where moisture from the outside penetrates through the side walls of the basement, the entire basement wall is first exposed and then carefully troweled with the bitumen thick coating.

Unfortunately, the method is quite time consuming, because on the one hand two layers must be applied and on the other hand, the renovation must first completely dry before the hole can be filled again.

Note details

However, the subsequent sealing can not really succeed if the basement wall as well as the seal is interrupted by lines for electricity or sewage. These passages will always disturb the vertical seal.

If you want to seal the basement afterwards, therefore, especially the details should be considered. All lines that must be passed through the sealing level, are particularly tight. The vertical seal must be connected to these openings.

Tips & Tricks

Even if you want to seal the cellar yourself afterwards, it is never wrong to get an offer from a professional. On the one hand, this tells you the type of moisture you may not know.

On the other hand, one sometimes finds that the professional is not as expensive as expected, but offers a guarantee on his work performed.

Video Board: How To Waterproof Exterior Basement Walls