What is rising damp?
Moisture barriers lose their effectiveness over years or may have never been adequate. There are many, in some cases considerably expensive, procedures to seal an already built house. They are difficult to use and often ineffective. In a few years, the old problem usually shows up again.
Over the years, dissolved salts carried by water penetrate the walls from the ground. These salts make the water conductive, resulting in a negative potential in the walls, which can be measured. Due to capillary forces and the salt having migrated, the water often ascends the walls to considerable heights.
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We completely renovated our basement into an apartment , removed all plaster and replastered again the whole basement . But we were not able to solve the problem with the walls because they were still wet. So two months after the renovation the new plaster was already turning black again due to the humidity in the walls. Then we had the Drymat system installed and in the first months we noticed already that it became less and less mouldy, after 1,5 years the controle measurement , done by Drymat Systems Portugal confirmed what we already knew , all walls showed a decrease in humidity level between 70 and 85 %, it´s very comfortable now to live in the apartment with all that humidity gone , so we will recommend anybody with a rising damp problem to contact Drymat Systems Portugal for a humidity survey which is even for free.