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The current condition of many building claddings and historical monuments clearly reveals that they are not immune to weathering action due to daily or seasonal temperature changes. In this study, porosity changes by variation in temperature have been investigated for two marble types: one calcitic and one pure dolomitic. The samples were exposed to ascending temperatures from 40 to 200°C. The results indicate that intergranular decohesion starts between 40 and 50°C. Some significant differences in temperature response for these two marble types could be distinguished. The temperature range 40–60°C is easily reached on building surfaces in most European countries during the summer months. A better understanding of the effect that temperature has on the porosity of marble could be used to develop a methodology for assessing suitable conditioning of marble before testing as well as to suggest appropriate impregnation and/or surface treatments of buildings and outdoor sculptures.

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