Since basement rooms are usually among the worst ventilated rooms, condensation on the walls is almost inevitable. This condensation can cause considerable damage to the building fabric in the long term. It must therefore be the goal of rehabilitation, to absorb the condensed water on a wall surface that is as porous as possible. For this purpose there are so-called Sanier- or Isoplaste, which you usually put in two layers on the endangered walls. Important: The wall must be sealed against pressing water, subsequent coats of paint or wall coverings must be open to vapor diffusion.
1 Den angerührten Isoputz ziehen Sie mit einer Glättkelle auf die grundierte und/oder mit Dichtschlämme bestrichene Wand auf. In the first step, a plaster thickness of approx 12 to 15 mm out.
2 Mit einer Latte oder Wasserwaage ziehen Sie dann den Putz auf eine gleichmäßige Dicke eben ab. Under no circumstances should you use the plaster, as usual, smooth, because you would close the resulting pores again. After the plaster surface has been dressed, you should roughen it up slightly with a felt board and leave it to dry for about eight hours. Then comes the second layer. The total thickness of the plaster must be at least 25 mm.
3 Die porige Struktur des Isoputzes hat zwei wünschenswerte Effekte: Firstly, the large pores interrupt capillary action and thus the rising of moisture. Secondly, the condensation in the basement room does not hit the wall surface, but instead settles inside the plaster and is released again when the room air is dry. The wall surface remains dry.