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How was taping done in the old days? Neither lime nor cement, but hardly any sand! This is the mudslinging. László Farkas tells a story at the Regio Earth festival next to an old wall while touching the wall. There was also an audience. You have to think about this technology too, because it doesn't require a lot of energy, electricity and gas. Order your Simply Passive House book here! www.egyszeruen-passzivhaz.hu