Columns in historic centre

The aim of cleaning the 209 historic centre columns has been divided into several steps:

1. Identification and classification of degradation phenomena of the column surfaces
2. Analysis of the main causes of colour and material alterations
3. Differentiation of the interventions based on the material, location and state of decay
4. Cleaning them with the aid of cellulose tampons soaked in reagent chemicals

For what concerns the portions characterized by exfoliation phenomena, or parts where sealing and grouting interventions are required, the columns were reinforced.