The historical renderings of Valencia (Spain): An experimental study

The external traditional renderings of the residential buildings in the city centre of Valencia are a distinctive aspect of the constructive tradition and of the architectural heritage of the city. In general, it is traditionally assumed that they are made of lime, but an experimental study which has been founded on a visual, chemical and petrographic-mineralogial analysis, has pointed out their true materiality; the employment of gypsum as the main binder in their composition. This material characteristic of the façades significantly marks the historical city centre from an aesthetic point of view because it defines every building singularly and in consequence the whole urban environment. But, especially it establishes a few clear limitations both material and technological when it comes to restore these façades; furthermore, it supposes their immediate protection and preservation.