Water or humidity is not the culprits of the anti-aesthetic ruin of plasters and walls. They reduce only the ability to heat your home from the external climate and also could facilitate the formation of black mold on the walls but nothing other. The one responsible for the ruin of your plasters so as to make the walls of your home unsightly and ugly is the Salt, the same used in the kitchen and that in the building is called white beard and the less practical white mold of the walls.Beware of low thickness sanitizing plasters. It will be a product that will surely make the moisture spread in your damp walls even more and within a few years it will disintegrate again.
Steps for a real rehabilitation of masonry
The first step is to eliminate the cause that has now led you to replace the plasters. Once the source of humidity has been eliminated the addition of salts in the walls will stop. After a few months make sure that the causes have been eliminated and that all the walls are drying. For example, repeat the weight measurements of humidity and compare them with the first to verify the effectiveness of the interventions. Have the types of salts present and their concentration analyzed in more points of your property. Knowing the type and concentration of salts you will be able to identify the right material to use for the new plasters. It is better to call for a national restoration experts to do the job.The plasters for restoration provide for the respect of some fundamental elements both for the single layer plastering cycle and for several layers.
Occurrence of the problem
The water that goes up in the walls through the classic phenomenon of rising damp is not demineralized but contains the same salts dissolved in the soil.New building materials contain small amounts of mineral salts for the simple reason that raw materials derive from the subsoil or from the use of recycled materials. These low concentrations remain harmless until there are phenomena of prolonged interstitial infiltration or condensation.The dejections of living beings contain high concentrations of mineral salts that in case of spills or breakage of the pipelines the salts will be lurking in building materials.
Conclusion: Remember the line
If you want to apply a new plaster on walls affected by rising damp and having a long life first you have to remove the source of moisture and then the salts. Only after verifying that the amount of moisture has actually decreased below certain values can you replace the plaster. To choose the right plaster it is essential to know the concentration and the types of mineral salts present in the walls since each type of plaster must be chosen according to the types of salts present.