Studying the types of plaster and textures – incredibly diverse in form, materiality and manufacturing – we also observed the types of decay that are encountered. Many people ask us how to repair them. That’s why the Pro Patrimonio team continues to study practical ways of intervening in different situations. We are currently studying repairs to a fence plinth made of bush-hammered similipierre, which was loose and cracked, and cleaning graffiti designs on different types of plaster.
The problems encountered on the fence are much more complicated than we initially estimated: very high humidity in the brick structure, poor quality support layers, detachments over much larger areas than the initial analysis. Work is currently underway to repair the structure and straighten the wall (it was leaning dangerously close to the street).
Regarding the cleaning of the graffiti drawings on the facade, we had technical discussions and some practical tests with the company Clean Teach Expert, which uses gel solutions to dissolve the pigments in the graffiti paints and then washes them with a hot water jet. Old drawings dissolve more slowly and need to be scrubbed off with a soft brush, but this can erode poor surface plasters. It is important that after cleaning, the facade is treated with a protective solution to prevent future spray paints from penetrating deep into the facade, in line with a functional and consistent City Hall policy to discourage this type of vandalism in the city.