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.