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During recent decades, the Santa Maria dei Battuti facade of the Conegliano Cathedral, painted by Ludovico Pozzoferrato in the XVI century, has been subjected to frequent intervention works to slow down a sharp increase in the degradation processes. According to previous investigations carried out respectively in 1989 and 2003 preliminary to the last two conservation works it was found that a sulphating process of fresco paintings was taking place. In addition a widespread presence of whitening of the painting surface was observed. At the end of the work it was decided to make some periodic checks on the wall paintings surface in order to establish if the decay products were increasing. In addition to the traditional laboratory analytical methods of analysis for the determination of soluble salts it was decided to map the gypsum presence on the wall paintings surface by using XRF spectroscopy. Making use of a transportable EDXRF system more than 350 analysis were carried out to check the full surface of the facade. Besides the degradation processes, the palette and painting techniques of the author were established. At the end of the scientific campaign, an up to now unique working protocol was established. The full facade was inspected and mapped out in all of its degradation processes. The result is a very powerful documentation of the state of the art of the fresco surface. This project was fulfilled with a strong synergy among scientists, art historians and restorers. Together with the results of the 'Santa Maria dei Battuti' facade, in this memoir the working protocol established is explained.