Abstract
A sixteenth-century Spanish wooden ceiling was installed in the Morning Room of Hearst Castle in the early 1920s. Since that time, the adhesion between the ground/paint layer and its wooden support has weakened considerably. As a first step in designing an effective conservation program, it was necessary to assess the role of the environment in this deterioration process. Air movement patterns, humidity and temperature parameters, air pollutants, and the impact of approximately one million visitors per year on the microclimate were studied over a one-year period. Correlations between the various components of the study were mapped, including CO2 concentrations vis-à-vis the number of visitors, and humidity and temperature changes in relation to tourists, air circulation patterns and variations in the external climate. As a result of this study, temporary measures were taken to improve the conditions of the immediate environment and proposals were made for more permanent solutions.
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