Algal defacement of facade materials – results of long-term natural weathering tests obtained by new diagnostic tools

Julia Von Werder, Helmuth Venzmer, Natalia Lesnych, Lev Koss & Julia Von Werder
The growth of algae on facade materials has developed to a serious, primarily aesthetical problem over the last decade. Responsible for the substantial increase in biologically soiled facades is the extended presence of humidity films on the building envelopes. Because of the high insulation levels required by law surface temperatures of new or renovated buildings fell significantly. Moisture films caused by driving rain and condensate dry only very slowly and are the most important pre-condition...
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