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The archaeological site of Mitla, the church of Santo Domingo de Guzmán and the Oaxaca Cathedral were mapped for lithology, intensity of damage and weathering features (Fig. 2). For most walls a representative area was selected, and each rock was mapped individually to make a semi-quantitative analysis.

In accordance to the German industrial norms, several laboratory tests were conducted for the analysis of the petrophysical and moisture parameters as porosity, density, capillary water absorption, water vapor diffusion, hygroscopic water sorption, 55ultrasonic velocity, rebound hardness and tensile strength. For the analysis of weathering properties, tests on the thermal expansion, hydric expansion and salt bursting were performed. The petrophysical properties were analyzed parallel (X-direction) and perpendicular to the bedding plane (Z-direction). A detailed description of the laboratory analysis can be found in (Siegesmund and Dürrast 2011).

Figure 2: Mapping in Oaxaca and Mitla. a): Lithological map of Santo Domingo de Guzmán, b): Weathering features at the eastern side of the Oaxaca Cathedral, c): Intensity of damage at the southern side of ‘el palacio’ at the archaeological site of Mitla.