**3.2.1 Natural stone products**

Light-coloured stone panels, such as white marble and beige sandstone did not record high surface temperatures in any of the four basic orientations (north, south, west and east). Furthermore, for all the examined orientations, their temperature at T19:30 was higher than the corresponding air temperature by only 1 to 2 oC. However, the panels of dark-coloured stone, namely grey and black granite, tended to overheat, with surface temperatures that may well exceed 50 oC for facades which face towards the east and the west. It is also important to note that for west-facing facades, clad with grey or black granite, the surface temperatures around sunset (T19:30) were a lot higher than the air temperature (15 oC and 17 oC, respectively).
