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Unaesthetic stains and deposits often form on external facades (especially those facing the north) in places where barriers were installed on them. Such places include, for example: fragments of facades in which external window sills were mounted, canopies, downspouts, boxes, advertising billboards, flags holders, lightning conductors, aerials as well as facade steps, and many others. During exploitation, elevations are exposed to water retention. In places were barriers are installed, moisture occurs with greater intensity than in other parts of the facade. Over time, in addition to the aesthetic problem, this results in biodeterioration (biological corrosion), induced by the deposited biological factors. The article presents the issue of placing barriers on external facades, on the example of buildings developed in Zielona Góra.

Biodeterioration Due to Improper Exploitation of External Facades